Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 76 Execution and use categories Consequences Class CC1 CC2 CC3 E1 Elements for which fatigue assessment is necessary 1 2 2 Elements not concerned by E1 but by some particular conditions, as following: - Temperature of service of elements < -20 °C, - Welded elements made of S355 steel grade with thickness > 25 mm - Welded elements made of S355 M and ML steel grade with thickness > 50 mm E2 - Main elements assembled by welding on construction site, 2 3 3 - Elements with hot forming manufacturing or receiving thermic treatment, - Elements of CHS lattice girder requiring end profile cuts, - Elements of crane way and corresponding skeleton, - Elements of structure with more than five floors, - Elements with full contact bearing surfaces. E3 Elements neither C1 nor C2. 2 3 4 Table 18 – Definition of execution classes 8.3.1 Specific requirements for welding Manufacturers Welding shall be undertaken in accordance with the requirements of the relevant part of EN 729 "Quality requirements for welding – Fusion welding of metallic materials" or EN ISO 14554 "Quality requirements for welding - Resistance welding of metallic materials" as applicable. When using EN ISO 15613 or EN ISO 15614-1 qualification procedures, the following conditions are required: a) where impact tests are required, they shall be carried out at the lowest temperature for which the standard of the steel grade requires impact properties; b) for steels according to EN 10025-6 (Quenched and tempered steels), one specimen for microexamination is required. Photographs of weld metal, fusion line zone and HAZ shall be recorded; c) for fillet welds on steel grades higher than S355 subject to tensile load, tests shall be completed by an additional cruciform tensile test performed in accordance with prEN ISO 9018; d) when welding on shop primers, tests shall be carried out on the maximum (nominal + tolerance) accepted layer thickness. e) if any welding process qualified in accordance with EN ISO 15614-1 has not been used by the constructor for a certain period, following requirements apply: - for steel grades up to S355, and if the procedure has not been used for a period of more than three years, a macro specimen taken from a production trial shall be inspected for acceptability; Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 77 - for steel grades above S355, and if the procedure has not been used for a period between one and three years, a production welding test, where shape and dimensions are according to the requirements of EN ISO 15614-1, shall be carried out (examination and testing shall include visual inspection, radiographic or ultrasonic inspection, surface crack detection, macro-examination and hardness test); - for steel grades above S355, and if the procedure has not been used for a period of more than three years, new welding procedure tests shall be carried out. Depending on the execution classes, different requirements apply, according to table 19. Requirements Quality requirements for fusion welding Execution Class 1 2 3 4 EN ISO 3834 - 2 EN ISO 3834 - 3 EN ISO 3834 -4 Welding procedures specification EN ISO15609 -1 Qualification of welding procedures by: Required Not required - welding procedures test* (EN ISO 15614-1) - pre – production test* (EN ISO 15613) - use of tested welding consumables (EN ISO 15610) - previous welding experience (EN ISO 15611) - standard welding procedure (EN ISO 15612) Welders and welding operators qualification Base materials inspection documents (ref. EN 10204) Welding Coordinator Recommended Recommended -- Recommended Recommended -- NOT recommended Recommended -- NOT recommended Recommended -- NOT recommended Recommended -- Required according to prEN ISO 9606-1 (EN 287-1) - welders and with EN 1418** - welding operators. type 3.1 type 2.2 type 2.1 Required, with comprehensive technical knowledge Required: all levels are accepted Not required * Time validity of the certificates and qualification tests are subject to special rules, specified in the following. ** For welding hollow section lattice structures, welders shall be qualified by a single-side welding test carried out on a branch connection Table 19 – Requirements for welding according to the execution classes For execution classes 1 and 2, if welding with deep penetration processes or two pass welding from both sides without back grinding is used, an appropriate macro or fracture specimen in accordance with EN 1321 or EN 1320 respectively, shall be tested at intervals not exceeding six months, in addition to the welding procedure test. Welding procedure specifications for joints in hollow section lattice structures shall define the start and stop zones, and method to be used in order to cope with situation where the welds change from fillet to butt aroundjoint. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
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Welding Fabrication Standards - EWF

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