Abstract
The effects of flux on fluid flow of the weld pool surface and arc profiles are observed in conventional TIG welding and in A-TIG welding by using high-speed video camera. The fluid flow behavior is visualized in realtime by micro focused X-ray transmission video observation system. The results indicate that stronger inward fluid flow patterns leading to weld beads with narrower width and deeper penetration can be apparently identified in the case of A-TIG welding. The flux can change the direction of fluid flow in welding pool and make the fluid flow speed increase four times. It agrees well with the simulation results.
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