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Welding control using fuzzy logic analysis of video imaged puddle dimensions

  • US 5,614,116 A
  • Filed: 10/31/1994
  • Issued: 03/25/1997
  • Est. Priority Date: 10/31/1994
  • Status: Expired
First Claim
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1. A welder comprising a welding torch on a controlled robotic arm, imaging means in the torch, a wire feeder on the torch and a weld controller for controlling the position of the torch and electric current supplied by the torch, characterized in that:

  • the weld controller comprises signal processing means for producing a first signal indicating a weld dimension in response to an output signal from the imaging means produced by the weld puddle;

    for providing from a plurality of stored logic sets and in response to the first signal a second signal indicating a degree of membership in a first set calling for a first current change and a third signal indicating a degree of membership in a second set calling for a lesser change in current;

    for providing a fourth signal that represents the product of the second signal and a first stored area value associated with said fist set;

    for providing a fifth signal that represents the product of the third signal and a second stored area value associated with the second set;

    for providing a sixth signal that represents the product of the second signal and a moment value for the first set;

    for providing a seventh signal that represents the product of the third signal and a moment value for the second set; and

    for providing an eighth signal that represents the value of the sixth signal divided by the seventh signal to initiate a change in the electric current.

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