... Approval testing of manual welders--Fusion welding-steel 钢熔化焊手焊工资格考核方法 Spiral Welding Steel Pipe 螺焊钢管 Welding Steel Tube 焊接钢管 ...
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螺旋焊接钢管 spiral welded steel pipe ; helical welding steel pipe
螺旋缝埋弧焊钢管 SAWH ; helical seam submerged-arc welded pipe
螺旋烧焊钢管 spiral welded steel pipe
螺纹焊接钢管 spiral welded pipe
螺旋焊接钢板套管 spiral-weld sheet metal casing ; weld sheet metal casing
螺旋电焊钢管桩 spiral-weld steel pipe pile ; weld steel pipe pile
螺旋焊钢管 SSAW steel pipe ; SSAW steel pipeline
埋弧焊螺旋钢管 SSAW
螺彷焊接钢管 spiral welded steel pipe
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