welded pipe production lines: to produce8-20mm, 12-32mm, 16-50mm, 25-76mm, 32-89mm... diameter welded pipes. straight welded pipe production line: to produce 8-20mm, 12-32mm, 16-50mm, 25-76mm, 32-89mm diameter welded pipes, with wall thickness as 0.6-1.5mm, 0.8-2.0mm, 0.8-3.0mm, 1-4.5mm....Work flow: {Steel strip}→→ Double-head un-coiler →→Strip-head shear and welder→→ Vertical accumulator → ...