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RESEARCH PAPERS

A Study on the Three-Dimensional Analysis of Heat and Fluid Flow in Gas Metal Arc Welding Using Boundary-Fitted Coordinates

[+] Author and Article Information
J.-W. Kim

Department of Mechanical Engineering, Yeungnam University

S.-J. Na

Department of Precision Engineering and Mechatronics, Korea Advanced Institute of Science and Technology, 373-1, Kusongdong, Yusonggu, Taejon, 305-701, Korea

J. Eng. Ind 116(1), 78-85 (Feb 01, 1994) (8 pages) doi:10.1115/1.2901812 History: Received September 01, 1991; Revised December 01, 1992; Online April 08, 2008

Abstract

Computer simulation of three-dimensional heat transfer and fluid flow in gas metal arc (GMA) welding has been studied by considering the three driving forces for weld pool convection, that is the electromagnetic force, the buoyancy force, and the surface tension force at the weld pool surface. Molten surface deformation, particularly in the case of GMA welding, plays a significant part in the actual weld size and should be considered in order to accurately evaluate the weld pool convection. The size and profile of the weld pool are strongly influenced by the volume of molten electrode wire, impinging force of the arc plasma, and surface tension of molten metal. In the numerical simulation, difficulties associated with the irregular shape of the weld bead have been successfully overcome by adopting a boundary-filled coordinate system that eliminates the analytical complexity at the weld pool and bead surface boundary. The method used in this paper has the capacity to determine the weld bead and penetration profile by solving the surface equation and convection equations simultaneously.

Copyright © 1994 by The American Society of Mechanical Engineers
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