longitudinal seam submerged-arc welded pipe
2.3.62电熔焊接钢管electric fusion welded steel pipe 2.3.63直缝埋弧焊钢管longitudinal seam submerged-arc welded pipe 2.3.64熔化极气体保护电弧焊钢管gas metal-arc welded pipe ..
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longitudinal seam submerged-arc welded pipe
纵缝埋弧焊管
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