Steel Buildings in Europe

Part 7: Model Construction Specification 7 - 44 Proposed Clauses Commentary 9.2 Qualification of welding procedures 9.2.1 Welding shall be carried out with qualified procedures using a Welding Procedure Specification (WPS) in accordance with the relevant part of EN ISO 15609 or EN ISO 14555 or EN ISO 15620. Qualifications of welding procedures, depending on welding processes, are described in Clauses 7.4.1.2 and 7.4.1.3 of EN 1090-2. 9.3 Welders and welding operators 9.3.1 Welders shall be qualified in accordance with EN 287-1 and welding operators in accordance with EN 1418. Records of all welder and welding operator qualification tests shall be kept available. 9.4 Welding coordination 9.4.1 Welding coordination shall be maintained during the execution of welding by welding coordination personnel suitably qualified for, and experienced in the welding operations they supervise as specified in EN ISO 14731. This option is needed for Execution Class EXC2, EXC3 and EXC4. With respect to the welding operations being supervised, and for structural carbon steels, welding coordination personnel should have a technical knowledge according to Table 14 of EN 1090-2. 9.5 Preparation and execution of welding 9.5.1 Precautions shall be taken to avoid stray arcing, and if stray arc do occur the surface of the steel shall be lightly ground and checked. Visual checking shall be supplemented by penetrant or magnetic particle testing. 9.5.2 Precautions shall be taken to avoid weld spatter. For Execution Class EXC3 and EXC4, weld spatter should be removed. 9.5.3 Visible imperfections such as cracks, cavities and other not permitted imperfections shall be removed from each run before deposition of further runs. 9.5.4 All slag shall be removed from the surface of each run before each subsequent run is added and from the surface of the finished weld. 9.5.5 Particular attention shall be paid to the junctions between the weld and the parent metal. 9.5.6 Special requirements for grinding and dressing of the surface of completed welds are shown on the relevant drawings. 9.5.7 Joint preparation shall be free from visible cracks. Visible cracks shall be removed by grinding and the joint geometry corrected as necessary. 9.5.8 If large notches or other errors in joint geometry are corrected by welding, a qualified procedure shall be used, and the area shall be subsequently ground smooth and feathered into the adjacent surface.