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Dynamic resistance test of spot welds

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1 Author(s)
B. Lloyd Cherry ; Lamar State College of Technology, Beaumont, Texas

The quality of a spot weld is determined by applying a periodic pressure while a test current is flowing through it. Poor quality is indicated by a variation in the weld resistance which results in a periodic potential across the weld. This potential is amplified for ease of detection. When a sinusoidal alternating current is used the presence of harmonic potentials indicates a poor weld. Removal of the fundamental by a filter is desirable before amplification.

Published in:

Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics  (Volume:82 ,  Issue: 2 )