NUMERICAL SIMULATION OF KEYHOLE’S DYNAMIC VARIATION IN CONTROLLED PULSE PAW PROCESS

doi:10.3724/SP.J.1037.2011.00072

Acta Metall Sin

2011, Vol. 47

Issue (8): 1061-1066 DOI: 10.3724/SP.J.1037.2011.00072

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NUMERICAL SIMULATION OF KEYHOLE’S DYNAMIC VARIATION IN CONTROLLED PULSE PAW PROCESS

SUN Junhua, WU Chuansong, QIN Guoliang

Key Lab for Liquid–Solid Structure Evolution and Materials Processing (Ministry of Education), Shandong University, Jinan 250061

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SUN Junhua WU Chuansong QIN Guoliang. NUMERICAL SIMULATION OF KEYHOLE’S DYNAMIC VARIATION IN CONTROLLED PULSE PAW PROCESS. Acta Metall Sin, 2011, 47(8): 1061-1066.

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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.

Key words: controlled pulse key–holing plasma arc welding keyhole dynamic variation numerical simulation

Received: 14 February 2011

ZTFLH:

TG456.2

Fund:

Supported by National Natural Science Foundation of China (No.50936003) and Specialized Research Fund for the Doctoral Program of Higher Education (No.20090131110023)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00072 OR https://www.ams.org.cn/EN/Y2011/V47/I8/1061

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