Title: NUMERICAL SIMULATION OF KEYHOLE'S DYNAMIC VARIATION IN CONTROLLED PULSE PAW PROCESS
Abstract: During the controlled pulse key-holing plasma arc welding (PAW), keyhole shape and size change with the welding current dynamically, and undergo variation of the establishing- expanding-contracting-closing process. Numerical analysis on such dynamic variation process of keyhole shape and size can provide insight into the process mechanism and basic data for optimizing the process parameters. In this study, a three-dimensional transient model is developed to conduct numerical simulation of welding temperature field, weld pool geometry, and keyhole shape and size in controlled pulse PAW. The keyhole shape and size are computed by analyzing the force-action on the weld pool surface, and two situations are considered to deal with partial keyhole and open keyhole. The dynamic variation features of three-dimensional keyhole shapes in weld pool in a pulse cycle are numerically calculated. Experiments are conducted to validate the numerical simulation result of key-holing duration.
Publication Year: 2011
Publication Date: 2011-08-11
Language: en
Type: article
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Cited By Count: 3
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