LST EN ISO 13919-2:2021 电子和激光束焊接接头 缺陷质量水平的要求和建议 第2部分:铝、镁及其合金和纯铜(ISO 13919-2:2021)
Electron and laser-beam welded joints - Requirements and recommendations on quality levels for imperfections - Part 2: Aluminium, magnesium and their alloys and pure copper (ISO 13919-2:2021)