A New Characterization Approach of Weld Nugget Growth by Real-Time Input Electrical Impedance

DOI: 10.4236/eng.2014.69054   PDF   HTML   XML   3,129 Downloads   3,593 Views   Citations


The in-process changes of weld nugget growth during the Resistance Spot Welding were investigated based on the resistance of input electrical impedance. To compute the time varying resistance of input electrical impedance, the welding voltage and current signals are measured simultaneously and then converted into complex-valued signals by using Hilbert transform. Comparing with the dynamic contact resistance as reported in literature, it showed that the time varying resistance of input electrical impedance can be accurately correlated with the physical changes of weld nugget growth. Therefore, it can be used to characterize the in-process changes of weld nugget growth. Several new findings were reported based on the investigation of spot welds under no weld, with and without weld expulsion conditions.

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Wong, Y. and Pang, X. (2014) A New Characterization Approach of Weld Nugget Growth by Real-Time Input Electrical Impedance. Engineering, 6, 516-525. doi: 10.4236/eng.2014.69054.

Conflicts of Interest

The authors declare no conflicts of interest.


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