This machine is used for longitudinal seam welding for radiator water-tank on automobiles. Imported metal inertia gas welding MIG/MAG as welding power, with pneumatic clamping and wire feeding unit so as to implement double longitudinal seam welding. Swing device as option of welding head to realize welding of wide beveling seam. Straight seam welding torch is driven by step motor. It's equipped with the precision linear guide ensures smooth &reliable action.