Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 26 Material Welding process Standard All applicable to the process Submerged arc welding (fluxes) EN 760 All applicable to the process TIG (tungsten electrodes) EN 26848 All applicable to the processes Shielding gases for arc welding and cutting EN 439 Flux (or metal) cored (gas) metal arc welding EN 758 TIG EN 1668 Non alloyed and fine grain steels Covered electrodes EN 499 MIG/MAG EN 440 Submerged arc welding (wire flux combination) EN 756 Covered electrodes EN 1599 Creep resistant steels TIG, MIG/MAG EN 12070 Flux (or metal) cored arc welding EN 12071 Flux (or metal) cored (gas) metal arc welding EN 12535 High strength steels Submerged arc welding (wire flux combination) EN 14295 TIG, MIG/MAG EN 12534 Covered electrodes EN 1600 Stainless and heat resistant steels Flux (or metal) cored (gas) metal arc welding EN 12073 TIG - Rods and wires EN 12072 Aluminium and Aluminium alloys TIG, MIG EN 18273 Nickel and Nickel alloys Covered electrodes EN 14172 2.9 Parent material Table 4 – Standards for the welding consumables The material shall be stored in a way, which prevents from adverse effects (this applies also to client supplied material). Moreover, some materials seem to be quite similar but possess very different properties; thus, identification shall be maintained at least during the storage. Even if it is not specifically required, a written procedure, which has to be prepared or is to be approved by the welding coordinator and has to be made available to the parent material warehouse, is suggested to cover this point of the standard. In order to be sure that the product delivered by the supplier complies with the Manufacturer’s needs and orders, references to the “certificates for the conformance of the furnished product to the order” can be made according to EN 10204 “Metallic products - Types of inspection documents”. In accordance with such a standard, inspection documents are divided in two groups, based on the following conditions: Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 27 - class 2 documents (namely 2.1, 2.2 and 2.3) are certificates or test reports issued by personnel employed in the production departments - class 3 documents (namely 3.1.A, 3.1.B, 3.1.C, 3.2) are inspection reports or certificates issued by personnel independent from the production departments. As a consequence, class 3 documents can be considered more objective, although they will add cost (and value) to the product to be delivered. It shall be noted that both above-mentioned types of documents refer to the Manufacturer order and to the relevant standards, which are to be attached to the documents. The type of document needed for the welding fabrication is not reported in the ISO 3834 Standard; possibly, this can be reported on product standards, on fabrication codes or can be a customer requirement. 2.10 Post-weld heat treatment (PWHT) Post-weld heat treatments as heat treatments in general can be considered as special processes. Figure 7 – Hot air heat treatment of a pressure vessel Hence, the Manufacturer is anyhow responsible for the quality of the final product and has to manage properly all the activities relevant to the heat treatment, which concerns: - subcontracting; - personnel; Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
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