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Spot welding control system and control method

  • US 6,232,572 B1
  • Filed: 04/20/1999
  • Issued: 05/15/2001
  • Est. Priority Date: 04/20/1998
  • Status: Active Grant
First Claim
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1. A spot welding control system comprising:

  • a pair of electrodes pressing a welding object, conducting a current through the welding object;

    an inter-electrode displacement amount detector substantially continuously detecting an inter-electrode displacement amount of the pair of electrodes;

    a regression line calculator calculating a regression line from inter-electrode displacement amounts detected by the inter-electrode displacement amount detector;

    a reference regression line memory having stored therein a reference regression line based on a reference inter-electrode displacement amount;

    a comparator comparing the regression line calculated by the regression line calculator with the reference regression line stored in the reference regression line memory;

    a welding condition setter setting a welding condition of the welding object in accordance with a result of comparison by the comparator; and

    a current conduction controller controlling a current conducting state of the pair of electrodes in dependence on the welding condition set by the welding condition setter.

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