本文件规定了铝及其合金电弧焊接头缺陷的质量等级。它适用于厚度超过0.5mm的材料。 给出了三个质量等级，以允许广泛应用于焊接结构。它们由符号B、C和D指定。质量等级B对应于成品焊缝的最高要求。质量水平指的是生产质量，而不是制造产品的适用性（见3.2）。 本文件适用于所有类型的焊接（例如对接焊缝、角焊缝和分支连接）、手动、机械化和自动焊接，以及所有焊接位置。 适用于以下焊接工艺: -金属惰性气体焊接（MIG焊接）；气体保护金属极电弧焊/美国； -钨极惰性气体保护焊（TIG焊）；钨极气体保护焊/美国； -等离子弧焊。 它不适用于冶金方面（例如粒度、硬度）。

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 fitness for purpose (see 3.2) of the product manufactured. This document is applicable all types of weld (e.g. butt welds, fillet welds and branch connections), to, manual, mechanized and automatic welding, and to all welding positions. It is applicable to the following welding processes: - metal inert gas welding (MIG welding); gas metal arc welding /USA; - tungsten inert gas welding (TIG welding); gas tungsten arc welding /USA; - plasma arc welding. It is not applicable to metallurgical aspects (e.g. grain size, hardness).