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Welder monitor

  • US 5,575,934 A
  • Filed: 10/13/1995
  • Issued: 11/19/1996
  • Est. Priority Date: 10/17/1994
  • Status: Expired due to Term
First Claim
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1. A welder monitor for monitoring a welding quality of materials sandwiched between and welded by two electrodes, said welder monitor comprising:

  • a detection means for detecting a welding current flowing between the two electrodes and a welding voltage applied between the two electrodes;

    an operation means for numerically analyzing, based on a heat conduction model, a temperature distribution of the two electrodes and that of the materials using the welding current and welding voltage both detected by said detection means, to thereby estimate a nugget diameter during welding;

    a reference diameter setting means for setting a reference nugget diameter;

    a diameter comparing means for comparing the nugget diameter during welding with the reference nugget diameter, to thereby compute a time at which the nugget diameter exceeds the reference nugget diameter;

    a reference time setting means for setting a reference time shorter than a given time until which welding of intended materials is not terminated;

    a time comparing means for comparing a nugget formation time, at which the nugget diameter during welding exceeds the reference nugget diameter, with the reference time set by said reference time setting means; and

    an output means for outputting a comparison result from said time comparing means;

    whereby when the nugget formation time is shorter than the reference time, the nugget formation time is outputted to said output means.

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