Spot Welding Machine

The medium frequency inverter spot weiding machine can rectify three-phase AC to DC and DC inverters into medium frequency 1000Hz square wave through the inverter circuit oomposed of IGBT. Then medium frequency 1000Hz square wave is connected into the primary of welding transformer, and the welding transformer make it with lower voltage and rectify it to be a dc supply electrode with little pulsation to the electrodes lo weld the work piece. The inverter can adjust the duty ratio of IGBT by feedback the primary or secondary welding current, so as to achieve the efect of constant current in the welding process.