Weld Penetration Sensing And Control

W. H. Chen; S. Nagarajan; B. A. Chin

doi:10.1117/12.948309

7 December 1988 Weld Penetration Sensing And Control

W. H. Chen, S. Nagarajan, B. A. Chin

Proceedings Volume 0972, Infrared Technology XIV; (1988) https://doi.org/10.1117/12.948309
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

Penetration depth is a key variable, which needs to be controlled to ensure defect-free welds. One of the major problems involved with adaptive control penetration is the lack of suitable variables which can be viewed directly by the sensor. A proposed sensing technique is to relate the invisible variables, such as penetration depth and thickness of the welded steel plates, to visible variables of thermal images. The sensed infrared information was obtained through digital signal process of the thermal images associated with the high temperature of the molten metal pool and its vicinity during the welding process. Quantitative measurements were conducted to find a relationship between visible and invisible parameters. The thickness of plates being welded was varied and the corresponding changes in both penetration depth and surface temperature distributions were studied quantitatively. A least squares method was used to fit the obtained isotherms to an equation of an ellipse. The penetration depth and thickness of the materials being welded were found to be functions of the minor axes and the area of the ellipse for Gas Tungsten Arc Welding (GTAW). The experimental results can be used to achieve adaptive penetration depth control.

Citation Download Citation

W. H. Chen, S. Nagarajan, and B. A. Chin "Weld Penetration Sensing And Control", Proc. SPIE 0972, Infrared Technology XIV, (7 December 1988); https://doi.org/10.1117/12.948309

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