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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Integrated Modeling of Transport Phenomena in Keyhole Welding with Plasma Arc

Get access (open in a dialog) DOI: 10.1615/IHTC15.pls.009408
pages 6445-6457

Resumo

Plasma arc welding involves intricate thermal, electrical, magnetic and fluid dynamics phenomena. To date, tremendous research has been carried out on the weld pool or the thermal plasma arc separately. Yet few studies have integrated the both aspects, much less the keyhole effect in addition. Accordingly, as an endeavor to advance the understanding of the transport phenomena in keyhole welding with plasma arc, a two-dimensional axisymmetric mathematical model has been developed to help gain access to the knowledge of energy conversion in the thermal plasma process and heat transfer due to the keyhole effect. In view of the extreme complexity of the arc-liquid-solid phase interactions, the keyhole geometry was pre-established according to previous experimental research. By solving a series of governing equations that contain the mass, the momentum, and the mingled thermal, electric and magnetic energy, temperature and velocity distributions were both exhibited in the arc region as well as in the workpiece, respectively. Results show that the plasma arc is easy to reach and maintain thermal stability. Moreover, arc flows, current density, and electromagnetic force were all predicted to further the understanding of thermal plasma process. It turns out that both shielding and electromagnetic force play an effective role in compressing the plasma arc. Finally, experiment was conducted on the stainless steel plate, and the measured weld pool is very close to that calculated by our model. This paper provided a better into the keyhole plasma arc welding.