对缝焊管 Jump welded tube ; butt-welded tube ; butt welded pipe ; [机] jump-welded pipe

对缝焊接管 butt-welded pipe ; black gas pipe ; welded pipe

电阻对缝焊管 electric resistance butt welded tube

钢制对焊无缝管件 Steel butt-welding seamless pipe fittings ; Steel butt-welded seamless fittings