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METHOD AND APPARATUS FOR THE QUALITY INSPECTION OF LASER WELDING

  • US 20120125899A1
  • Filed: 04/26/2011
  • Published: 05/24/2012
  • Est. Priority Date: 11/18/2010
  • Status: Active Grant
First Claim
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1. An apparatus for inspecting the quality of laser welding, comprising:

  • a laser welding system configured to perform a laser welding process on a laser welding part;

    a quality inspection sensor configured to sense a plasma light generated from the laser welding part and then output a plasma light sensing signal; and

    a quality inspection unit configured to receive the plasma light sensing signal outputted from the quality inspection sensor, convert the received plasma light sensing signal into an electrical signal, filter the converted electrical signal, and determine the quality of the laser welding based on an instantaneous variation of the plasma light as an AC component of the filtered electrical signal of the plasma light,wherein the quality inspection unit further comprises a frequency dividing and filtering/amplifying portion configured to divide the plasma light sensing signal outputted from the quality inspection sensor into a plurality of frequency bands, filter one or more of the frequency band divided signals individually, amplify one or more of the frequency band divided signals individually, synthesize the filtered and amplified signals, and output a square of an input value of the synthesized signal through a multiplication amplifier.

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