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Comparison in the inverter spot welder and power frequency AC spot welder
 inverter spot welder power frequency AC spot welder
Current characteristics 

1, Pulse DC current. 
2, Welding cycle min: 0.25 ms(4kHz), high precision. 
3, Constant current output, detect and feedback in every cycle. 
4, Avoid the power fluctuations. 
5, Accurate and Digitizing control.