Protect feature of carbon-dioxide ★Low cost 40%~50% of that of hidden arc welding and handed arc welding. ★High efficiency with strong penetration, big weld penetration, high melting coefficient, high speed, production efficiency is 1-4 times as that of handed arc welding. ★Wide scope of application able to weld any place. For thin board, 1mm narrow-space welding, space less than 0.5mm; for thick one, by multi layer welding. quicker than gas welding with little distortion. ★Strong rust proofing welding seam with low hydrogen and excellent crack resistance. ★Without dregs after welding as open arc, easy to monitor and control, heplful to realise the mechanization and modernization of welding procedure. The products are widely used in mechanical industry like car, motorbike, bridge, ship, container and war industry.