Weldpool flow visualization studies during gas tungsten arc welding of steel and aluminum.
Schupp, Peter E.
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A flow visualization study of current distribution effects on weld pool stirring in GTA steel welds is presented using a pulsed ultraviolet laser vision system. Weld pool stirring is almost eliminated in HY-80 steel by the use of symmetric current flow path within the weld samples. Periodic radial surface pulses are observed at low currents in stationary welds while flows of turbulent nature are observed at higher currents. Autogenous welds on 17.75 cm by 28.0 cm by 1.27 cm thick 6061 aluminum plates are also studied to determine resulting surface flow characteristics and weld pool growth rates. Clockwise stirring in conjunction with a vertical undulation is noted in stationary welds. Solidified weld zone exhibits a profound crater that was not present in welds on HY-80 steel.
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