焊接. 铝和铝合金的弧焊接头. 缺陷质量分级指南

[中文适用范围]： 本文件规定了铝及其合金电弧焊接头缺陷的质量水平。 它适用于厚度超过 0.5 毫米的材料。 给出了三个质量级别，以便能够应用于广泛的焊接结构。 它们用符号 B、C 和 D 表示。 质量等级 B 对应于成品焊缝的最高要求。 质量水平是指生产质量，而不是所制造产品的适用性（见 3.2）。 本文件适用于所有类型的焊缝（例如对接焊缝、角焊缝和分支连接）、手动、机械化和自动化焊接以及所有焊接位置。 它适用于下列焊接工艺： ——金属惰性气体保护焊（MIG焊）；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（例如晶粒尺寸、硬度）。 [外文原描述]： 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).