Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (7): 56-60.

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Measurement of W elding Current and Voltage for Resistance Spot Welding Inverter

Cao Biao  Huang Zeng-hao  Zeng Min   

  1. College of Mechanical Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-09-02 Online:2005-07-25 Published:2005-07-25
  • Contact: 曹彪(1963-)，男，副教授，博士，主要从事焊接电源及其智能控制研究 E-mail:mebcao@scut.edu.cn
  • About author:曹彪(1963-)，男，副教授，博士，主要从事焊接电源及其智能控制研究
  • Supported by:

    教育部留学回国人员基金资助项目

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Abstract:

The accurate measurement of welding current and voltage is very important to the exact control of resistance spot welding inverter and welding quality.In this paper.the typical measuring methods for large currents are introduced,and the Rogoswki outer-integral measurement is adopted to obtain the large welding current of resistan ce spot welding in-verter.This method is proved feasible by the an alysis of experime ntal results and the model simulation via Matlab.More-over.the welding current and voltage waveforms under diferent current setting an d diferent welding load conditions are analyzed.with the results showing that the welding current is a kind of direct current with slight pulses,while the weld-ing voltage is evidently pulsed.Thus,the dynamic information of the welding current an d voltage is obtained .

Key words: inverter, resistance spo t welding, welding current, welding voltage