... 3,Welding thickness:2.0-12.0 ZX7-400amp heavy duty welding machine A.Feature and Application 1.Advanced Inverter technology and ... safty and reliable.5.Supper compact and portable, best for outdoor movable working and high altitude working. 6.Beautiful shape ... steel, carbon steel, and other non-ferrous metals.9.Suitable for vehicle manufacturing, shipbuilding, chemical, boiler, food, medical, kitchen, ...