Steel Buildings in Europe

Part 7: Model Construction Specification 7 - 26 Visible imperfections such as cracks, cavities and other not permitted imperfections shall be removed from each run before deposition of further runs. 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. Particular attention shall be paid to the junctions between the weld and the parent metal. Any requirements for grinding and dressing of the surface of completed welds shall be specified. Joint preparation shall be appropriate for the welding process. If qualification of welding procedures is performed in accordance with EN ISO 15614-1, EN ISO 15612 or EN ISO 15613, joint preparation shall comply with the type of preparation used in the welding procedure test. Tolerances for joints preparations, and fit-up shall be given in the WPSs. Joint preparation shall be free from visible cracks. Visible cracks shall be removed by grinding and the joint geometry corrected as necessary. 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. All surfaces to be welded shall be dry and free from material that would adversely affect the quality of the welds or impede the process of welding (rust, organic material or galvanizing). Prefabrication primers (shop primers) may be left on the fusion faces only if they do not adversely affect the welding process. For Execution Class EXC3 and EXC4, prefabrication primers shall not be left on the fusion faces, unless welding procedure tests in accordance with EN ISO 15614-1 or EN ISO 15613 have been completed using such prefabrication primers. Other special requirements are described in EN 1090-2, as indicated in Table 9.1.