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Resistance spot welding gun with weld quality detection feature

  • US 4,542,277 A
  • Filed: 05/29/1984
  • Issued: 09/17/1985
  • Est. Priority Date: 05/29/1984
  • Status: Expired due to Term
First Claim
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1. In an apparatus for detecting the quality of a resistance spot weld on workpieces using a welding gun, the improvement wherein:

  • said welding gun includes a fluid activated cylinder having two opposite ends, a piston assembly within the cylinder having a piston rod extending through both ends thereof, one end of the piston rod being coupled to a first electrode for contacting a surface of one of the workpieces, said cylinder being slidably mounted on supporting structure and being connected to a second electrode for contacting an opposite surface of the other workpiece to be welded to said one workpiece, the opposite end of the piston rod being coupled to a sensor assembly having a housing mounted for movement with the cylinder, whereby said sensor assembly provides output signals for detecting the quality of the weld as a function of piston rod movement relative to the cylinder.

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