The twice impulse process is employed to change the metallic structure of the resistance welding so as to improve the welding strength.

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。

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Based on the pre-process, numerical simulation and post-process, the application of visualization technique, which is used in the numerical analysis of resistance spot welding process, is introduced.

从前置处理、数值计算及后置处理三个方面出发，着重介绍可视化技术在电阻点焊过程数值分析软件中的应用。

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Numerical simulation is an important method for investigating of resistance spot welding process.

数值模拟是研究电阻点焊过程和机理的重要手段。

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