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。
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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