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.
这过程被称为完全退火，因为它去除了以前组织结构的所有痕迹、细化晶粒并软化金属。
This process is known as full annealing because it wipes out all trace of previous structure, refines the crystalline structure, and softens the metal.
研究分析了合金过渡层与金属基体接合界面组织结构。
The microstructure between alloy transition layer and base metal has been studied.
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