螺旋缝 meaning in English

spiral seam

Spiral submerged - arc welded steel pipe for municipal heat supply
城市供热用螺旋缝埋弧焊钢管
Sichuan petroleum administration ziyang steel pipe plant ( zspp ) is the designated factory by cnpc to manufacture spiral arc - welded steel pipe ( shortened as " spiral welded pipe " )
四川石油管理局资阳钢管厂是中国石油天然气集团公司螺旋缝双面埋弧焊钢管（以下简称螺旋焊管）定点生产厂。