AUTOMATIC DETECTION OF BURN-THROUGH IN GMA WELDING USING A PARAMETRIC MODEL
✍ Scribed by S. Adolfsson; K. Ericson; A. Grennberg
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 486 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0888-3270
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✦ Synopsis
This paper addresses the problem of automatic detection of burn-through in weld joints. Gas metal arc (GMA) welding with pulsed current is used, and welding voltage and current are recorded. As short-circuitings are common between the welding electrode and the work piece during burn-through, a short-circuit detector is developed to detect these events. To detect another specific characteristic of burn-through-a broadband long-lasting voltage component-this detector is combined with a square-law detector. This second detector is based on a non-linear modification of an autoregressive model with extra input (ARX-model) of the welding process. The results obtained from this compound detector indicate that it is possible to detect burn-through in the welds automatically. The work also indicates that it is possible to design an on-line monitoring system for robotic GMA welding.