... multiple-operator welding-unit多重操作焊接单元 multiple-pass weld多道焊缝; 多路焊接 multiple-spot welding多点焊 ...
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The etched section also reveals that multiple weld passes were made over the top of the original submerged arc weld pass.
从酸蚀断面还可以看出：在原自动埋弧焊的上面覆盖有多层焊道。
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