This machine is an amphibious welding machine(MMA and TIG). The inverter power is the power that first changes 50/60HZ working frequency to high frequency (as high as 100KHz) with high power factor V-MOS, and then reduces the voltage and rectifies, and then output with PWM the welding and cutting power of high power factor. By using the inverter technology of switch power, the weight and volume of the mains transformer greatly reduces, while the efficiency is raised by over 30%. This welder leads the arc easily, automatically control to raise the arc, postpone closing gas, and the gas can be lead in advance. This device is applicable for welding of such materials as stainless steel, metal alloy steel, carbon steel, copper and other non-ferrous. This series is especially applicable for using in family.