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METHOD AND APPARATUS FOR MONITORING WELD QUALITY

  • US 3,609,285 A
  • Filed: 09/04/1968
  • Issued: 09/28/1971
  • Est. Priority Date: 09/04/1968
  • Status: Expired due to Term
First Claim
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1. Weld quality-monitoring means for welding equipment having a plurality of spaced electrodes and means to apply clamping pressure and welding power to opposite sides of parts to be welded together, said quality-monitoring means having weld upsetmonitoring means including sensor means for producing a signal as a function of separation of the electrodes, said sensor means being connected with one of the electrodes to vary its output signal as a function of the separation of the electrodes, first switching means connected to the sensor means, a memory circuit connected to the first switching means to store the signal at the initiation of the welding operation, a comparison circuit connected to the sensor means and to the memory circuit to provide a signal indicative of the displacement of the said one electrode at the conclusion of the weld after the electrodes have pressed into the surfaces of the parts to be welded relative to its initial position, and circuit means for determining whether the signal is within acceptable limits, whereby weld upset and its acceptability is determined.

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