multiple-pass weld 中文意思是什麼
multiple-pass weld
解釋
多道焊縫-
The etched section also reveals that multiple weld passes were made over the top of the original submerged arc weld pass.
從酸蝕斷面還可以看出:在原自動埋弧焊的上面覆蓋有多層焊道。
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