Welding. Arc-welded joints in aluminium and its alloys. Quality levels for imperfections1 Scope This document specifies quality levels for imperfections in arc welded joints in aluminium and its alloys. It applies to material thicknesses above 0,5 mm. Three quality levels are given in order to permit application to a wide range of welded constructions. They are designated by symbols B, C and D. Quality level B corresponds to the highest requirement on the finished weld. The quality levels refer to production quality and not to the

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