美利体育登录入口官网:PNS ISO 15614-1:2021 金属材料焊接程序的规范和鉴定.焊接程序试验.第1部分:钢的电弧焊和气焊以及镍和镍合金的电弧焊
Specification and qualification of welding procedures for metallic materials - Welding procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys