螺旋双面埋弧焊缝
Spiral double submerged arc welded seam
直缝双面埋弧焊
longitudinally double submerged arc weld
双弧埋弧焊
twin arc submerged arc welding
双面埋弧焊
double-sided submerged arc
单面焊双面成形
single face welding with double face forming
One-side welding with back formation
welding by one side in shape by both sides
double side form with single side weld
single welding and double faced forming
Both sides forming of one side welding
One side welding with back formation
wo sided modeling on one side welding
单面焊双面一次成形
one-side welding with back
激光—电弧双面焊
laser-arc double sides welding
双面焊缝接口
double fillet welded joint
双面埋弧螺旋焊接
double submerged arc helix welding
双面埋弧自动焊
double-side automatic submerged arc welding
双面双弧
double side double arc welding
X80钢级直缝埋弧焊管
X80 steel SAW straight welded tube