Garza, F. and Das, M. (2001) On Real Time Monitoring and Control of Resistance Spot Welds Using Dynamic Resistance Signatures. Proceeding of the 44th IEEE-Midwest Symposium on Circuits and Systems, Dayton, 14-17 August 2001, 41-44.

has been cited by the following article:

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

  AUTHORS: Yoke-Rung Wong, Xin Pang

  KEYWORDS: In-Process, Input Electrical Impedance, Dynamic Contact Resistance, Weld Nugget, Hilbert Transform

  JOURNAL NAME: Engineering, Vol.6 No.9, August 7, 2014

  ABSTRACT: 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.