Imaging the Keyhole in PAW of Aluminum Alloys

[+] Author and Article Information
B. Zheng, R. Kovacevic

Southern Methodist University, Dallas TX 75275

H. J. Wang, Q. L. Wang

Harbin Institute of Technology, Harbin 150001, P. R. China

J. Manuf. Sci. Eng 121(3), 372-377 (Aug 01, 1999) (6 pages) doi:10.1115/1.2832691 History: Received November 01, 1997; Revised December 01, 1998; Online January 17, 2008


This paper presents a technique for front image sensing of the weld pool in variable polarity plasma arc welding of aluminum alloys, and describes the determination of the geometrical size of the keyhole for subsequent real-time feedback control of a full penetration weld. Image formation occurs when the arc light reflects off the concave mirror-like surface of the depressed keyhole weld pool, and passes through a band-pass filter onto the image sensor. The image of the visual keyhole (nominal keyhole) is a two-dimensional projected picture of the actual keyhole weld pool. The variation in area of the nominal keyhole is closely correlated with the variation of the bottom width of the weld bead.

Copyright © 1999 by The American Society of Mechanical Engineers
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