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① The welding current is close to complete direct current, the thermal efficiency is high, the welding current of the same workpiece can be reduced by 40%, the welding range can be increased, the electrode life can be improved, and the energy saving effect is obvious.
② The weight and volume of the resistance welding transformer are reduced to 1 / 5-1 / 3 of the same power frequency welding machine, which improves the flexibility of the welding machine.
③ It can improve the control accuracy and response speed, and it is easy to achieve stable constant current control.
④ The control is more reliable. In case of fault, such as short circuit or grounding, IGBT switch is cut off within 3 hours, which is much faster than thyristor.
⑤ Because the secondary circuit is high-quality DC, no inductive loss, improve the effect of energy saving
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