Scan Welding: Thermal Modeling and Control of Material Processing

[+] Author and Article Information
G. Korizis, C. Doumanidis

Dept. of Mechanical Engineering, Tufts University, Medford, MA 02155

J. Manuf. Sci. Eng 121(3), 417-424 (Aug 01, 1999) (8 pages) doi:10.1115/1.2832697 History: Received December 01, 1997; Revised June 01, 1998; Online January 17, 2008


This article provides a thermal analysis of scan welding, as a redesign of classical joining methods, employing computer technology to ensure the composite morphologic, material and mechanical integrity of the joint. This is obtained by real-time control of the welding temperature field by a proper dynamic heat input distribution on the weld surface. This distribution is implemented in scan welding by a single torch, sweeping the joint surface by a controlled reciprocating motion, and power adjusted by feedback of infrared temperature measurements in-process. An off-line numerical simulation of the thermal field in scan welding is established, as well as a linearized multivariable model with real-time parameter identification. An adaptive thermal control scheme is thus implemented and validated both computationally and experimentally on a robotic Gas-Tungsten Arc Welding setup. The resulting productivity and quality features of scan welding are comparatively analyzed in terms of material structure and properties of the joint.

Copyright © 1999 by The American Society of Mechanical Engineers
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