Introduction and features of intermediate frequency spot welder First of all, IF spot welder is a machine that converts 50 Hz three-phase AC to IF DC after inverter rectification filter. and then welds the workpiece through an integrated fixed point welder or spot welder If spot welder mainly has the following characteristics: (1) Because each millisecond has a welding current feedback, the welding quality will be very stable, the welding current control can be accurate to 100 Ann, and can save more than 35% electricity, low operating cost;