DIN EN 287-2
焊工认可试验 - 熔焊 - 第2部分:铝及铝合金
Approval testing of welders – Fusion welding Part 2: Aluminium and aluminium alloys
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Approval testing of welders – Fusion welding Part 2: Aluminium and aluminium alloys
Aluminium and aluminium alloys—Compositions and designations Part 1: Wrought products