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Perfect Welding

Model qualification of an additively manufactured pressure vessel

Partnership

15/10/2024
Arc-based metal 3D printing is well on the way to radically changing metal component manufacturing. The near-net-shape additive manufacturing process with welding wire shapes three-dimensional objects by applying welding beads layer by layer. Examples can be found in the fields of plant engineering, aircraft construction, and toolmaking or lightweight construction. This is particularly advantageous for complex geometries with a high proportion of machining. Here the process is more flexible and often more economical than machining or forming processes. There are also benefits in the spare parts business, prototype construction, and small series production. Standards for metal 3D printing are now available in North America, and are in progress for additively manufactured, unfired pressure vessels in Europe. Linde Engineering, MIGAL.CO, TÜV SÜD Industrie Service GmbH, and Fronius International GmbH are taking the lead with the intention of helping the wire-based manufacturing method make its final breakthrough. 

Tailor-made and just-in-time components

Classic manufacturing techniques such as casting are often associated with the construction of complex molds and tools. There are also lead times and development costs to consider. Companies that adopt metal 3D printing can significantly shorten their production cycles. Additive manufacturing processes not only drive the rapid production of sample parts (rapid prototyping), but also just-in-time manufacturing. As such, they help to avoid risky single source situations—in other words, dependence on individual suppliers, and the associated high storage costs. When various components are needed, the correct “recipes” are selected in the software and “printed” as required. There are hardly any limits for component geometries. By contrast, topology and flow-optimized designs feature prominently in everyday production in additive manufacturing—even for large components. 

CMT welding process ideal for metal 3D printing

3D printing works with various processes. Wire-based processes such as “Fronius Additive” melt the welding wire, building up the workpiece layer by layer. To stop too much heat flowing into the workpiece, they must be designed to apply as little energy as possible. The MIG-based Cold Metal Transfer welding process (CMT) from Fronius is especially suitable for metal 3D printing of aluminum components. CMT is a “cool” dip transfer arc process that minimizes the heat input, despite its high deposition rate. This process is therefore ideal for additive welding, where the cyclical build-up of beads causes a high heat input.

CMT supports functions that are perfect for metal 3D printing. “Power correction” is a typical example. This function allows the electrical power to be precisely adjusted to the respective process phase while the deposition rate remains constant.

“With our CMT Additive Pro functions, specifically developed for additive manufacturing, such as power correction, or the Deposition Stabilizer that keeps the deposition rate constant, we can precisely control the power input and thus the height and width of the weld,” explains Leonhard Reiter from Fronius R&D. 

Fronius supports the development of standards for additively manufactured components and pressure equipment

As a member of the “Joint working group for additively manufactured components under the Pressure Equipment Directive of the German Institute for Standardization (DIN),” Fronius participated in the model qualification of an additively manufactured component in collaboration with MIGAL.CO, Linde Engineering, and TÜV SÜD. The working group assessed the applicability of the draft standard prEN 13445-14 to the components of unfired pressure vessels. 

Drawing on their particular areas of expertise, the participating partners carried out material qualification, design review, process qualification, additive manufacturing, component and pressure testing, as well as full documentation of the process chain, at their respective locations, and a binding additive manufacturing procedure specification (AMPS) was subsequently created. 

“The entire value chain, including all the monitoring details, is considered in the draft standard for prEN 13445-14, and in the previously published DIN/TS 17026. This ensures that the fundamental safety requirements defined in Pressure Equipment Directive 2014/68/EU can be met,” says Dr. Kati Schatz, Linde Engineering, outlining what is in the forthcoming standard. “All the details are included. This applies in particular to the material requirements, design, qualification of the additive process, manufacturing and testing, as well as acceptance and documentation. There is hardly any difference between this procedure and that for conventionally manufactured pressure vessels. Even though it has yet to provide the “presumption of conformity” of the intended harmonized standard, and there will still be revisions, the specification can nevertheless serve as a guide for all those involved in the additive manufacturing process of pressure equipment.”

Design, material, and filler material

The entire process chain was checked using a pressure vessel in the form of a pipe branch. As per the design template, the branch (additively applied area up to the stub) was formed on a conventionally manufactured base pipe with a cut-out provided for this purpose. This is known as a hybrid component, because the substrate material to be welded on will become an integral part of the pressure vessel. 

“We decided to use aluminum as the material. We use the naturally-hardened wrought alloy in plant construction because of its excellent low-temperature toughness down to minus 273 °C. Welding the material is challenging, however. It’s not just the choice of process and the process parameters that are crucial to the result, but also the choice of filler material,” explains Martin Lohr, Linde Engineering.

The filler material plays a key role in metal 3D printing, as tight tolerances apply both to the diameter and to the chemical composition, with the aim being to include as little hydrogen as possible. Furthermore, the wire must be free of inclusions and neatly wound onto a spool to ensure that the manufacturing process runs smoothly.

“The carbon footprint of the welding wire is an important environmental aspect, because it’s relevant in terms of the climate impact,” points out engineer Robert Lahnsteiner, CEO of MIGAL.CO, adding: “Ours is 3.8 kg CO2 per kilogram of aluminum, which amounts to less than a quarter of the international average.”

Designing the component and selecting the process

The aim was to optimize the transition from the base pipe of the pressure vessel to the stub in terms of both flow and topology. The design resulted in the following wall thicknesses: 8 mm for the base pipe, 14 mm for the transition from base pipe to branch, and 5 mm for the branch.

  Base pipe Transition Branch
Material EN AW-5083 /   AlMg4.5Mn Al 5183 / AlMg4.5Mn Al 5183 / AlMg4.5Mn
Wall thickness/DED thickness [mm] 8 14 5
Outer diameter [mm] 273 273/168 168

Selecting the DED process (Direct Energy Deposition process)

The essential requirements for the DED process (also known as the wire arc additive manufacturing process) were as follows for the model qualification of the pressure vessel:

  • The highest possible deposition rate
  • A reduced-heat process to avoid or minimize the cooling requirement and distortion  
  • No lack of fusion in the connection to the base material
  • Insensitive to changes in the distance between welding torch and component
  • Absolute reproducibility of the high material quality required within the qualified limitations of the deposition process
  • Suitability for large components

Based on the requirements, the MIG-based CMT process was chosen for the additive build-up of the weld layers—specifically, CMT mix for the first layers and CMT Additive Pro for the subsequent wall build-up, where the use of power correction significantly influenced the heat input. 

Qualifying the process

Due to the different wall thicknesses of the transition from the base pipe to the branch, the scope of application of prEN 13445-14 required three separate process qualifications (DPQR). The resultant deposition procedure specifications (DPS) are binding for the additive welding process. The final “recipe” for metal 3D printing, the so-called additive manufacturing procedure specification (AMPS), thus comprises three deposition procedure specifications, instructions for the welding sequence, and notes on material certificates and operator qualifications.

“In addition to welding guidelines, material certificates and operator qualifications are what ensures a consistent standard of product quality for additively manufactured components,” explains Manfred Schörghuber of Fronius R&D. 

The individual test pieces were subjected to non-destructive and destructive testing as per the requirements of prEN 13445-14. Visual and dimensional tests (VT), volume tests (RT-D), and surface tests (PT) were used as non-destructive testing processes to provide evidence that the pieces were free from faults both externally and internally. 

“We demonstrated that the mechanical and technological requirements for the additively manufactured material and the hybrid connection were met by checking the chemical composition and by conducting tensile and bending tests perpendicular to the direction of the deposition layer. We then performed metallographic analyses at the start and end points, and at the hybrid connection,” explains Martin Boche from TÜV SÜD.

Planning and simulating the robot path

The path for the robotic welding task was planned using a three-dimensionally modeled pipe branch in the CAM software (computer-aided manufacturing software) developed at Fronius.

“We calculated the proposed additive build-up—the actual welding program—by entering the layer height, position, speed, and build-up strategy. The welding path was visualized in a robotic welding cell that we modeled in our software,” adds Leonhard Reiter of Fronius R&D.

Position sensing and sensor travel

The component was scanned using Fronius WireSense so that it could be perfectly positioned and corrective action taken with regard to the manufacturing tolerances. This innovative sensor technology uses the wire electrode as a tactile sensor and scans the welding contour point-by-point. If the electrode extension touches the surface, a short circuit occurs, which triggers a distance signal and transfers it to the welding robot. The system’s software compares the target value programmed offline with the actual value of the WireSense travel, and corrects the welding path for additive manufacturing as necessary. The wire then immediately moves backward and—while the robot continues moving the welding torch—forward again to the next point, where a further short circuit is triggered, a distance signal is generated, and the welding path is modified again, if necessary. This minimizes geometric deviations.

Producing the component

The various wall thicknesses in the transition to the branch were implemented via different oscillation amplitudes. A constant heat balance was required to ensure the necessary optimal weld toe from bead to bead, and the uniform weld seam flow. Layer-specific welding jobs with specific parameters were used for this.

A water supply and return were provided for the component during the welding process. The water level this produced had to be far enough away from the welding point to maintain the interpass temperature in the qualified area. This allowed continuous welding without cooling breaks. Cooling of the component minimized component distortion and increased the deposition rate. 

“To observe the build-up of the layers, we used a camera that was triggered in synchronization with the process. This allowed us to analyze the process deviations more accurately afterwards,” adds Reiter of Fronius R&D.

Monitoring parameters and documentation

The WeldCube welding data management software monitored the parameter limits stated in the AMPS (additive manufacturing procedure specification) and issued a warning as soon as the preset limits were exceeded. The sum of all the parameters yielded the “fingerprint” of the additive build-up and facilitated analyses in the event of possible discontinuities.

Final component testing and looking ahead

The final testing, including confirmation of CE conformity, was performed by notified body 0036 of TÜV SÜD Industrie Service GmbH. In the present case, a starting material with mechanical data in a future, harmonized European standard (“harmonized” design) and a component of design class DC1, the result was a component inspection scope in accordance with the table below:

Type of test  Testing processes  Scope of testing
Non-destructive testing 
  • Volume testing (RT or UT)
  • Surface testing (VT and PT) 
Per component, 100% of the relevant areas of the design (or 20% if using a suitable grid to fully cover the area) 
Destructive testing
  • Chemical analysis
  • Tensile test to determine strength and elongation
  • Bending test
1x in the additively manufactured area
2x in the unfavorable direction, and also in the hybrid area  
2x in the unfavorable direction, and also in the hybrid area
Final testing Water pressure test
Bursting test (optional)

“In parallel with these tests, we developed metallographic analyses covering especially those areas where imperfections had been detected. Also affected were the transition areas between the classic material and the additive welding deposition, the hybrid area. The main purpose of the metallographic analyses was to verify the data collected from parameter monitoring and from mechanical, technical, and non-destructive testing. In this case, samples were taken to gain a clear idea of the extent to which the material and the applied manufacturing process were flawless,” explains Boche.

Now that the conformity assessment procedure has been completed according to Module G of the European Pressure Equipment Directive 2014/68/EU, in the form of a “model qualification” of an additively manufactured pressure vessel with subsequent CE label to confirm compliance with the requirements of this EU directive, the pressure vessel joint working group of the German Institute for Standardization (DIN), represented by Linde Engineering, TÜV-SÜD Industrie Service GmbH, MIGAL.CO and Fronius, is looking to increase the acceptance of additive manufacturing in general, and in plant and container construction in particular.

“In conclusion, we can definitely say that decades of experience with arc-based welding processes—combined with stable and innovative processes such as Fronius CMT Additive Pro—offer compelling reasons to increase the use of metal 3D printing in plant and container construction. This creates a competitive edge, especially in view of the associated advantages such as topology optimization, just-in-time manufacturing, and supplier independence,” sums up Schörghuber.

Detailed information on model qualification can be found in the following documentary.

 

Fronius unleashes customers’ welding potential

If you would like to experience the complete 3D offering for yourself, you can visit Formnext in Frankfurt am Main, Stand C99, Hall 12.0 from November 19 to 22, 2024, or the ADIPEC trade fair in Abu Dhabi, November 4 to 7, 2024. Hall 14, Stand 14316. The Fronius experts are looking forward to showcasing the new offers and options in person. Anyone interested in benefiting from Fronius’ know-how in 3D printing and solving complex welding challenges is welcome to contact the specialists in the Fronius prototyping center. 

You can find out more about Fronius Additive Pro here.

Information about the prototyping center can be found here

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General terms and conditions

1. APPLICABILITY

1.1 All deliveries and other services effected by Fronius UK Limited (“we”, “us”, “our”, “our-selves”), and all payments made to us, shall be exclusively governed by these Terms of Delivery and Payment. Insofar as applicable provisions may be found to be missing therefrom, the law of England applies. If any business terms of the Ordering Party’s are at variance with these General Terms of Delivery and Payment, we shall only be bound by such divergent terms if we have expressly recognized the same by letter or by telefax.

1.2 In taking delivery of the goods and/or service, the Ordering Party acknowledges the exclusive applicability of our Terms of Delivery and Payment.

2. OFFERS

2.1 Our offers may be changed or withdrawn by us at any time before acceptance by the Ordering Party, unless the offer makes express mention of an offer validity period. Documents pertaining to our offers – such as drawings, illustrations, samples and patterns, and dimensional, weight, performance and consumption data – contain or themselves constitute only approximate data and are not deemed to be specially agreed characteristics unless otherwise provided. We retain the right to effect modifications for engineering reasons.

2.2 We reserve the proprietary and intellectual property rights including but not limited to copyright to all costs estimates, drawings and other documents; The Ordering Party must ensure that these are neither disclosed to any third party nor used for the purpose of any third party.

3. ACCEPTANCE OF THE ORDER; SUPPLEMENTARY AGREEMENTS

Acceptance of an order, and any undertakings or supplementary agreements made by our employees, as well as amendments and alterations of any kind, shall not be binding upon us until we have issued written confirmation by letter, telefax or e-mail.

4. PRICE AND PAYMENT CONDITIONS; OFFSETTING

4.1 Valid prices are always the ones stated in the last offer to the customer and unless specifically stated in writing from Fronius to the contrary, all orders placed on these prices are valid on the date of delivery. These offers are ex-works prices (EXW (Incoterms in the latest version)), exclusive of packaging, insurance, loading at the factory and value-added tax; the packaging will not be removed by us. The Ordering Party shall pay all applicable tariffs, duties or taxes (other than our income taxes) imposed or levied in connection with the supplies made by us under these Terms of Delivery and Payment.

4.2 Payments are to be made net cash, without any deduction and free of charges, within 30 days of the invoice date. It shall be for us to decide which claims or partial claims of the Ordering Party’s may be offset against such payments.

4.3 If any changes in order execution are necessitated by circumstances where risk is borne by the Ordering Party, then this latter shall bear all additional costs thereby incurred.

4.4 If the payment period is exceeded, we shall be entitled to charge default interest at a rate of ten percentage points above the applicable base rate announced by the Bank of England, plus the collection costs, such amounts to total at least 12% p.a. of the overall claim (or such lesser amount determined by us as is reasonable in the circumstances). This is without prejudice to any further consequences of default in payment.

4.5 The Ordering Party is not permitted to withhold payments (in whole or in part) or to offset these against counter-claims which are contested by ourselves.

4.6 Where the Ordering Party holds claims against ourselves, we are entitled to offset these against our own claims against the Ordering Party, at any time.

4.7 For services performed under contracts for work and materials (installation, repairs, maintenance and other such work), we shall charge the hourly rates and materials-prices applicable at the time of completion, plus our applicable surcharges for any overtime, night-time, Sunday and public-holiday working; travel and waiting times are counted as working hours. Travel expenses and daily and overnight allowances will be invoiced separately.

5. PERFORMANCE, SHIPPING AND DEFAULT

5.1 The delivery period under each order shall commence with the mailing of the order confirmation note by us to the Ordering Party, while the performance period for installation, maintenance or repair work commences when the equipment is received by the Ordering Party. On no account, however, shall the delivery or performance period start to elapse sooner than 14 days after the time when the Ordering Party has furnished us with the documents (e.g. engineering drawings, plans etc), permits or approvals which it is responsible for procuring under the order, or when it has made any agreed pre-payment under the order. The delivery or performance deadline is deemed to have been met if we have notified the Ordering Party prior to such deadline of our readiness to deliver or perform; in cases where a special agreement obliges us to dispatch or deliver by a deadline, the delivery or performance deadline shall be deemed to have been met if the object of delivery or performance has left our factory prior to such deadline.

5.2 Delivery or performance periods are extended for the duration of any unforeseen impediments lying outside our control, such as, but not limited to, stoppages, major personnel outages, unlawful strikes, delays in supplies of essential raw materials or components or the like, as well as by circumstances where risk is borne by the Ordering Party, to the extent that these impediments and/or circumstances are of material relevance to the failure to meet the deadline. Impediments and/or circumstances of this nature also prevent a default arising for which we would otherwise be liable, for the duration of such impediments and no contractual remedies for which we would otherwise be liable will apply. Immediate notification is to be given of the beginning and end of such impediments. We are entitled to terminate the contract, in whole or in part, if such impediments should occur. In the event of termination under this 5.2, and subject to 9, we exclude all liability of any kind whatsoever except to the extent the Ordering Party proves gross negligence on our part.

5.3 If agreed delivery or performance deadlines, or deadlines that have been extended in accordance with 5.2 above, are exceeded by more than four weeks, the Ordering Party shall be entitled to terminate the contract, having granted us at least 14 days’ extra time by notice given to us in a registered letter. In the event of termination under this 5.3, and subject to 9, we exclude all liability of any kind whatsoever except to the extent the Ordering Party proves gross negligence on our part.

5.4 If the Ordering Party incurs a loss from a delay for which we are liable, then it shall be entitled to compensation amounting to 0.5% per whole week - up to a maximum of 5% - of the value of that part of the delivery which cannot be used in time or for its intended purpose as a result of the delay. For services, the compensation shall be 5% of the remuneration. The compensation payments detailed in this 5.4 shall be the Ordering Party’s sole and exclusive remedy in the event of such delay, and subject to 9, we exclude all other liability of any kind whatsoever except to the extent the Ordering Party proves gross negligence on our part. For the avoidance of doubt, subject to 9, we shall not be liable for any delays caused by our suppliers for which we are not responsible.

5.5 In cases where we have undertaken to effect shipping, the mode and route of shipping shall be for us to decide. Goods are always shipped at the Ordering Party’s risk and expense. Subject to 9, we exclude all liability of any kind whatsoever in relation to such shipping except to the extent the Ordering Party proves gross negligence on our part. We shall only take out transport / breakage insurance by order and for the account of the Ordering Party.

5.6 We are entitled to effect part-deliveries.

5.7 Our compliance with the delivery period shall be contingent upon the Ordering Party having fulfilled its contractual obligations in all pending, still-to-be-completed business transactions.

5.8 If shipping is delayed due to circumstances where risk is borne by the Ordering Party, then this latter shall bear all resulting additional costs, such as those for storage at our factory, but with a minimum monthly charge of 0.5% of the invoice amount. In such a case we shall also be entitled to grant the Ordering Party a grace period of at most 14 days, and if this period should expire to no avail, we shall then be entitled, at our own discretion, either to make alternative arrangements regarding the article(s) to be delivered and to effect delivery to the Ordering Party within a suitably extended period of time, or to terminate the contract and claim damages for breach of contract. In this latter case, we are entitled, without having to furnish any particular proof, to require up to 10% of the remuneration for the intended delivery as liquidated damages (as is reasonable in all the circumstances). Where appropriately substantiated, we can also claim compensation for any damage suffered by us over and above this amount.

5.9 Goods ordered on call, or for production with no shipping instructions, must be taken delivery of within three months. If this time limit elapses unused, then the goods will be treated as subject to a shipping delay due to circumstances where risk is borne by the Ordering Party and 5.8 shall apply.

5.10 For services performed under contracts for work and materials (4.7), the Ordering Party is to provide us with the necessary equipment and auxiliary materials (e.g. winches, rails, electricity etc.) in good time and at no charge, even if installation is included in the price (4.1) or if a flatrate price has been agreed for this. Any works needing to be carried out by the Ordering Party preparatory to installation, e.g. building work, must be completed prior to the arrival of our installation technicians. Furthermore, the Ordering Party must take all safety precautions needed for the protection of persons and property. Subject to 9.4, we shall not accept liability for the ancillary personnel, equipment and auxiliary materials which may be placed at our disposal unless gross negligence is proven on our part.

6. PASSAGE OF RISK

6.1 Unless otherwise stated, risk shall pass to the Ordering Party as soon as the articles to be delivered, or the articles on which we have performed maintenance, repair or other work, have left our factory. The same shall also apply to part-deliveries or in cases where we have under-taken to bear the shipping charges or to perform delivery, setting-up, assembly, installation or other similar services. If the maintenance, repair or other work is carried out on the premises of the Ordering Party, then risk shall pass in the case of the latter as soon as the Ordering Party has received notification that the work in question has been completed.

6.2 If there is any delay in dispatching or delivering the shipment for reasons for which we are not responsible, the risk shall pass to the Ordering Party as soon as it has been notified that the consignment is ready for delivery.

7. RETENTION OF TITLE; RESCISSION

7.1 We shall retain title to the article(s) delivered until the following have been settled in full:

(a) payment of the purchase-price for the relevant articles, and

(b) all other claims that we have – on whatever legal grounds – against the Ordering Party.

7.2 Until title in the article(s) delivered passes from ourselves to the Ordering Party:

(a) the Ordering Party shall store the article(s) in such manner as to show clearly they are our property, and not do any other thing that is inconsistent with identifying the article(s) as our property;

(b) the Ordering Party must notify us immediately of any seizure of the article(s), or any other infringement of our interests as the owner of the article(s); and

(c) we shall be entitled to trace the proceeds of any sale, transfer, assignment, charge, pledge, let, hire or other grant of any interest in the article(s) to a third party, and such proceeds will be deemed to be held on trust for us.

7.3 If the Ordering Party should act contrary to the terms of these Terms of Delivery and Payment – in particular by being in arrears with payment or with any other contractual obligation, and/or by being insolvent – we shall be entitled, at our own discretion, either to terminate the relevant order(s) without granting any grace period or, while leaving the relevant order(s) in force, to take back the article(s) delivered or to forbid it to be used. We shall also be entitled to sell the taken-back article(s) in the open market; after deduction of a handling fee of 10% of the proceeds thus realised (or such lesser amount determined by us as is reasonable in the circumstances), the remainder will be debited from the total of our outstanding claims against the Ordering Party. In the event of our terminating the order(s), we shall charge the Ordering Party a usage fee of 5% of the original value of the article (or such lesser amount determined by us as is reasonable in the circumstances), unless the actual diminution in its value is even greater. 

8. WARRANTY

8.1 We give no warranty for ordinary deviations in size, weight or quality (or as tolerated by ÖNORM, EN or DIN standards or other applicable standards), and also no warranty for informmation given regarding the suitability of the article(s) to be delivered for the purpose contem-plated by the Ordering Party, or for any other particular purpose.

8.2 We warrant the correctness of our processing instructions, user/operating manuals and customer advisory service. We do not warrant compliance with statutory or other regulations when using the articles delivered, and the testing of these articles for the purpose envisaged, shall remain the sole responsibility of the Ordering Party. We shall only be liable for any instructions differing from our written processing instructions and user/operating manuals if we expressively previously confirmed these deviations to the Ordering Party in writing, either by letter, telefax or e-mail. 

8.3 Articles or services supplied must be inspected by the Ordering Party immediately after delivery has been taken of them. Any defects must be reported to us during the warranty period and promptly upon being discovered, in a written notice sent by letter, telefax or e-mail quoting the number and date of the order confirmation note, of the delivery note or of the invoice, and the serial and commission numbers and such details as are reasonably necessary to identify the defect. If the Ordering Party omits to make this prompt notification, it may no longer assert any warranty claims or claims for compensatory damages on account either of the defect itself or of any misapprehension as to whether the delivery or service was free of defects. Any costs which we incur as a result of unjustified notices or notices that are otherwise at variance with the conditions of use are to be refunded to us by the Ordering Party.

8.4 In the case of corrective and preventive maintenance work, our warranty shall be limited to the services actually rendered. We shall only warrant correct functioning of an installation, machine, Software or the like whose components were not all supplied by ourselves if we provable have undertaken – despite the provision of certain components by the Ordering Party or by third parties – to manufacture the installation (or machine etc.) as a whole, and if the faulty functioning in question is not attributable to incorrect or incomplete information from the Ordering Party. 

8.5 Unless otherwise agreed, the warranty period for all warranted articles or services shall be 24 months. From the beginning of the 13th month of this period, however, our warranty shall be limited to making available, free of charge, the items needed for remedying the defects; from this time onwards, any warranty claims going beyond the above shall not be permitted. This period limitation also applies to the supply of items deemed to be immovable and to work on items which are, or are deemed to be, immovable. The warranty period for goods shall start to elapse upon the passage of risk in accordance with Point 6 and, for services shall start to elapse from the completion of the provision of the services. The Ordering Party must always prove that defects coming to light during the warranty period were already present at the time of the passage of risk or completion of services (as relevant). 

8.6 In cases where there is a breach of warranty, we shall – at our own discretion and within a reasonable period of at least 4 weeks’ duration – either exchange the defective article itself, or its defective components, for a defect-free article or defect-free components, or remedy the defect(s), or grant the Ordering Party a reasonable reduction in price, or (unless the defect in question is a minor one) terminate the order. The warranty period is not prolonged by the exchange of the item or of parts or components belonging to the item. If, however, the remainder of the warranty period – including that part of the period during which our warranty is limited to free provision of the requisite materials in accordance with Point 8.5. – lasts for less than twelve months, then the warranty period for the exchanged items, parts or components shall be extended to twelve months. The items, parts or components thus exchanged shall become our property. We shall not refund the costs for any actual or attempted remedying of a defect by the Ordering Party or by any third party. 

8.7 To the extent that is necessary and may reasonably be expected of the Ordering Party, the object of delivery or performance, or the defective part(s) thereof, are to be dispatched or shipped to us immediately at our request, at the Ordering Party’s risk and expense, failing which any and all warranty obligation on our part shall become void.

8.8 The Ordering Party is not entitled to withhold payments on account of warranty claims or other counterclaims not recognised by ourselves.

8.9 Warranty claims from the Ordering Party are excluded in cases where the installation, user and operating manuals provided by ourselves, or to be requested from us by the Ordering Party, have not been observed, or where the user has not fully observed such instructions; if the installation work has not been performed properly and in accordance with the relevant Standards, and in particular if was not carried out by licensed contractors; if any corrective maintenance or other work has been performed on the object of delivery or performance without our consent; if it has been improperly operated or used, or operated despite its protective features being faulty, or taken out of the contract territory without our consent, or used contrary to our instructions or for purposes for which it is not intended; and, moreover, where defects are attributable to foreign object damage, chemical influences, overvoltage, the conduct of third parties or to force majeure; the same applies in respect of natural wear-and-tear. 8.10 Our warranty is also excluded in cases where we have been contracted to carry out repair-orders, to alter or modify used items, or to supply such items.

8.11. Finally all warranty claims shall be excluded if the Ordering Party installs third-party components or replacement parts in our delivery items or services provided by us which have not been expressly recommended by us prior thereto.

8.12. In addition to the rights of the Ordering Party in accordance with Point 8.6. regarding the delivery of inverters for photovoltaic systems the guarantee in accordance with the guarantee conditions of Fronius shall apply, available at www.fronius.com/solar/garantie.

9. DAMAGES

9.1 We shall only be liable for damage suffered by the Ordering Party, of whatever kind, to the extent that the Ordering Party proves that we ourselves brought about this damage either knowingly and wilfully or grossly negligently. If the Ordering Party proves that we have caused damage in an ordinarily negligent manner, our liability shall be limited to the direct damage actually incurred by the Ordering Party, and, moreover, to a maximum overall amount not exceeding the total order value. Furthermore, claims of this type may only be enforced if made by the Ordering Party within six months of the damage in question becoming known.

9.2 In the event that a claim is made against us by a third party in connection with services provided by us where we have produced and delivered in accordance with the drawings, designs, models or other documents provided by the Ordering Party, the Ordering Party shall indemnify us in full against all losses, damages, costs, liabilities and expenses suffered or incurred by us in respect of that claim.

9.3 To the extent permitted by law, our liability to pay damages for property damage by reason of the applicable product liability legislation, including all rights of recourse, is excluded. When using the installations, machines and other articles delivered by ourselves, the Ordering Party is obliged to painstakingly observe all safety regulations, technical rules, installation regulations, operating instructions and user manuals, and in particular all regulations apply-ing to the electrical engineering field, and to allow only authorised skilled personnel to operate the equipment.

9.4. Nothing in these Terms of Delivery and Payment shall exclude or in any way limit our liability to the Ordering Party for (i) fraud; (ii) death or personal injury caused by its negligence (including negligence as defined in s.1 Unfair Contract Terms Act 1977); (iii) breach of terms regarding title implied by s.12 Sale of Goods Act 1979 and/or s.2 Supply of Goods and Services Act 1982; or (iv) any liability to the extent the same may not be excluded or limited as a matter of law.

9.5. We shall not be liable to the Ordering Party under any order made under these Terms of Delivery and Payment for any loss of income, loss of actual or anticipated profit, loss of business, loss of contracts, loss of goodwill and reputation, loss of anticipated savings, loss of , damage to or corruption of data or for any indirect or consequential loss or damage of any kind, in each case howsoever arising, whether such loss or damage was foreseeable or in the contemplation of the parties and whether arising in or for breach of contract, tort (including negligence), breach of statutory duty, indemnity or otherwise.

9.6. Any liability for damage caused by the installation or use of third party components or replacement parts with our delivery items, which have not been verifiably and expressly recommended by us, shall be excluded.

10. CONSISTENT TO DATA PROTECT

Client shall agree that Fronius International GmbH and its subsidiaries may collect, process and use personal data (such as name, address, email address), if applicable also by commissioning a service provider, for the purpose of sending information regarding products and services of any kind (e.g. by post, email, newsletter and more). A dissemination to externals in excess thereof shall not occur (excluded are legal or judicial obligations to provide information). The consent may be objected at any time in writing, in the newsletter there is also a link to unsubscribe.

11. FINAL PROVISIONS

11.1 These Terms of Delivery and Payment and any legal disputes arising out of or in connection with any orders made under these Terms of Delivery and Payment are to be governed by English law. The sole place of jurisdiction shall be London. The UN Convention on Contracts for the International Sale of Goods and the International Private Law shall not be applicable.

11.2 If any term of these Terms of Delivery and Payment is found to be illegal, invalid or unenforceable under any applicable law, such term shall, insofar as it is severable from the remaining terms, be deemed omitted from these Terms of Delivery and Payment and shall in no way affect the legality, validity or enforceability of the remaining terms.

11.3 The Contracts (Rights of Third Parties) Act 1999 shall not apply to these Terms of Delivery and Payment and no person who is not a party to an order made in accordance with these Terms of Delivery and Payment may enforce any provision of them.

12. SPECIAL PROVISIONS FOR SOFTWARE SUPPLIED TOGETHER WITH ORDERED ITEMS OR SOFTWARE SUPPLIED SEPARATELY

For software delivered together with other items or for software delivered separately (hereafter “software”) these Terms and Conditions of Delivery and Payment only apply insofar as these do not deviate from the following conditions or from conditions agreed upon separately with the Ordering Party.

 

12.1. SCOPE OF USE

12.1.1 All rights of intellectual property, such as copyright, trademark rights, design rights, patent rights, utility model rights and know-how, as well as in particular unprotected inventions, commercial experience, trade secrets and such like, independent from the time these were disclosed to the Ordering Party, shall be reserved at any time by us or our licensors. The Ordering Party shall have the right to use the software after payment of the agreed sum exclusively for his own purposes in accordance with the acquired number of licences. With the present contract only the authorization to use the software is acquired. Dissemination by the Ordering Party shall be excluded in accordance with the copyright law. With a possible participation of the Ordering Party in producing the software no rights other than the specified usage laid out in Section 12 are acquired. The Ordering Party may only use the software simultaneously on one device, which one is his decision. Usage of the software shall constitute any long-term or even any temporary duplication (copying) of the software, whether in whole or also only in part, by saving, loading, running or displaying for the purpose of execution of the software and processing of the data contained therein by the hardware. He shall not be authorized to copy the user manual.

12.1.2 The Ordering Party shall be permitted to make copies of the software for archival and data protection purposes on condition that there is no explicit prohibition in the software or any accompanying material (instruction manual, packaging, etc.) and that all copyright and proprietary notices are transferred unchanged in these copies. Retranslations of the programme code (decompilation) exceeding the legal provisions shall not be permitted.

12.1.3. If the software is equipped with technical copy protection, the Ordering Party shall in the case of damage be supplied with a replacement copy after restitution of the data carrier.

 

12.2 FURTHER RIGHTS

In the event of availability of a new software version the Ordering Party shall be entitled to exchange the supplied software package for a similar software package of the new version at our listed update price; the exchange implies the software package as a whole, as it was acquired by the Ordering Party. With the exchange Ordering Party´s permission to use the exchanged software package shall expire. In such an event the Ordering Party shall immediately and completely destroy all copies, partial copies and backup copies as well as altered or revised versions of the software and the copies, partial copies and backup copies made thereof.

 

12.3 WARRANTY

12.3.1 The Ordering Party shall note that it is not possible to develop software programmes in such a manner that these are free from defects for every application condition.

12.3.2 We shall warrant that the supplied software fulfils the agreed functions and has the expressly guaranteed properties. Requirement for any warranty is usage according to contract. A defect for which we are responsible shall only be deemed to exist if the software does not function according to the most recent version of the corresponding performance description/ documentation and if this is reproducible by the Ordering Party. In order to carefully examine possible occurring defects the Ordering Party shall be obliged to support us in the rectification of any defects.

12.3.3 We further shall warrant that the original software is duly recorded onto a tested data carrier. Excepted here from are previously installed software and third-party software products.

12.3.4 Software defects shall be documented by the user and we shall be notified in writing with immediate effect; otherwise 8.3 shall apply.

12.3.5 The warranty period shall always be twelve months; the period commences with the dispatch of the software package.

12.3.6 If the software package is not usable or defect (12.3.2), we shall exchange it primarily for a new one of the same title or for an adequate alternative solution. If this also proves to be unusable or defect and if we are not in a position to make it usable with adequate effort within an adequate time, but at least within a period of four weeks, the Ordering Party may demand a price reduction or a change. Costs of defect rectification by the Ordering Party or a third person shall not be compensated by us.  

12.3.7 In excess of this (12.3.6) we shall not provide warranty, in particular not in the case of the supplied software not meeting the special requirements of the Ordering Party or user, and also not for altered or revised versions of the software (point 12.1.2), unless the Ordering Party can prove that the defects are not connected to the alterations or revisions. The Ordering Party itself is solely responsible for the selection, installation and usage of the software as well as for the results intended therewith.  

12.3.8 In the event of unjustified assertion of defects in the software we shall be entitled to charge the Ordering Party with any incurred costs according to valid cost rates.

12.3.9 A change of the end-user shall exclude any warranty claims 

 

12.4 COMPENSATION

12.4.1 All further claims of the Ordering Party or third persons, in particular claims for compensation for damages of any kind, shall be excluded, unless the injured party can prove that the damage was caused by us either intentionally or due to gross negligence.

12.4.2 Otherwise Point 9 shall apply accordingly.