Welding Fabrication Standards - EWF

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