Modeling and Control of Timeshared and Scanned Torch Welding

[+] Author and Article Information
C. C. Doumanidis

Department of Mechanical Engineering, Thermal Analysis for Materials Processing Laboratory, Tufts University, Medford, MA 02155

J. Dyn. Sys., Meas., Control 116(3), 387-395 (Sep 01, 1994) (9 pages) doi:10.1115/1.2899233 History: Received March 02, 1993; Revised June 17, 1993; Online March 17, 2008


Optimization of the weld quality and productivity requires in-process identification and simultaneous regulation of several thermal characteristics of the joint. Since in traditional single-torch welding only a few process variables can be modulated in real-time, multiple source configurations are implemented by a rapidly reciprocated (timeshared) GTAW torch to obtain decoupled control of the weld geometry, structure and properties. Further, to widen the range of achievable weld features, a scanning motion of the torch on the entire part surface generates the necessary heat distribution for any specified thermal field in the weld, which is observed through surface temperature measurements. Analytical, numerical, and experimental thermal modeling techniques are employed for the design of multivariable adaptive and distributed-parameter controllers, applied to girth and flange welding simulations, and tested in seam pipe welding experiments, for rejection of process disturbances and for weld quality regulation performance.

Copyright © 1994 by The American Society of Mechanical Engineers
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