Affiliation:
1. Center for Robotics and Manufacturing Systems, University of Kentucky, Lexington, KY 40506
Abstract
A three-dimensional numerical model is developed to describe the fluid flow and heat transfer in weld pools. Both full penetration and free deformation of the top and bottom weld pool surfaces are considered. Temperature distribution and fluid flow field are obtained. In order to analyze the influence of welding parameters on the geometrical appearance of weld pools, a normalized model is developed to characterize the geometrical appearance of weld pools. It is found that welding current can significantly affect the geometrical shape. When welding current increases, the curvature of the pool boundary at the trailing end increases. The effect of the welding speed on the geometrical appearance is slight, although its influence on the pool size is great. In the interest range of arc length (from 1 mm to 4 mm), the arc length can affect both the size and the shape of the weld pool. However, compared with the welding current and speed, its influences are much weaker. GTA welding experiments are performed to verify the validity of the numerical models. The appearance of weld pools was obtained by using machine vision and a high-shutter speed camera. It is found that the calculated results have a good agreement with the experimental ones.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference26 articles.
1. Kou
S.
, and LeY., 1985, “Grain Structure and Solidification Cracking in Oscillated Arc Welds of 5052 Aluminum Alloy,” Metall. Trans., Vol. 16A, p. 13451345.
2. Kou
S.
, and LeY., 1985, “Alternating Grain Orientation and Weld Solidification Cracking,” Metall. Trans., Vol. 16A, p. 18871887.
3. Kou
S.
, and LeY., 1985, “Improving Weld Quality by Low Frequency Arc Oscillation,” Weld. J., Vol. 64, p. 5151.
4. Kou
S.
, and LeY., 1988, “Welding Parameters and the Grain Structure of Weld Metal—A Thermaldynamic Consideration,” Metall. Trans., Vol. 19A, p. 10751075.
5. Savage
W. F.
, LundinC. D., and AronsonA. H., 1965, “Weld Metal Solidification Mechanics,” Weld. J., Vol. 44, pp. 175s175s.
Cited by
17 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献