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.
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September 1994
Research Papers
Modeling and Control of Timeshared and Scanned Torch Welding
C. C. Doumanidis
C. C. Doumanidis
Department of Mechanical Engineering, Thermal Analysis for Materials Processing Laboratory, Tufts University, Medford, MA 02155
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C. C. Doumanidis
Department of Mechanical Engineering, Thermal Analysis for Materials Processing Laboratory, Tufts University, Medford, MA 02155
J. Dyn. Sys., Meas., Control. Sep 1994, 116(3): 387-395 (9 pages)
Published Online: September 1, 1994
Article history
Received:
March 2, 1993
Revised:
June 17, 1993
Online:
March 17, 2008
Citation
Doumanidis, C. C. (September 1, 1994). "Modeling and Control of Timeshared and Scanned Torch Welding." ASME. J. Dyn. Sys., Meas., Control. September 1994; 116(3): 387–395. https://doi.org/10.1115/1.2899233
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