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石油焊打底用什么符号

发布时间: 2024-09-07 15:01:12

A. 图纸上石油化工管道焊接氩弧焊打底用什么符号表示

压力容器焊工证书上用：GMAW
焊接方法代号：141
钨极惰性气体保护焊TIG

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