应用二次脉冲电流，改变电阻焊熔核的金属组织结构，达到提高焊接强度的目的。
The twice impulse process is employed to change the metallic structure of the resistance welding so as to improve the welding strength.
本文还在此基础上设计了软开关逆变电阻焊电源主电路及控制电路：主电路选用全桥零电压零电流（FB-ZVZCS）阻焊电路，其中包括对主电路参数设计和计算；
Introduced a newly designed inverter resistance welding power on this basis, main circuit's topological structure adopt FB-ZVZCS, and do some work about the parameters design and calculate;
计算结果表明：三相次级整流电阻焊焊接电流基本上是连续的，负载感抗变化对其影响很小。
The calculating result shows that the welding current of 3-phase DC resistance weld is continuous, and the changing of induction reactance has little influence on it.
计算结果表明：三相次级整流电阻焊焊接电流基本上是连续的，负载感抗变化对其影响很小。
The calculating result shows that the welding current of 3-phase DC resistance weld is continuous, and the changing of induction reactance has little influence on it.
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