Mig Tig Welding Machine , Automatic Straight Seam Welder for Pipe/ metal products DESCRIPTION Automatic straight seam welding machine adopts argon arc welding machine as the welding power source. The stepping motor drives the welding gun to conduct constant speed movement. The moving speed and length is set through PLC; use pneumatic pressing plate to press to ensure the stability and consistency of welding; the action program of the whole machine is controlled by PLC; use