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Method of controlling welding current in direct-current resistance welding machine

  • US 5,406,045 A
  • Filed: 12/22/1993
  • Issued: 04/11/1995
  • Est. Priority Date: 12/24/1992
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a welding current for welding a workpiece successively at a plurality of welding points with a direct-current resistance welding machine, comprising the steps of:

  • welding the workpiece with a stepped welding current having at least a first current value and a second current value greater than said first current value;

    applying both said first and second current values to each of the welding points in a predetermined welding current waveform, wherein said second current value is initiated at a predetermined start time in said welding current waveform;

    if expulsions are produced on the workpiece while it is welded, shifting said predetermined start time when said second current value is applied with respect to each of the welding points, so that said start time occurs earlier in said welding current waveform; and

    if no expulsions are produced on the workpiece while it is welded, shifting said predetermined start time when said second current value is applied with respect to each of said welding points, so that said start time occurs later in said welding current waveform.

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