Determination of GTA welding efficiencies.
Franche, Candonino P.
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A method is developed for estimating welding efficiencies for moving arc GTAW processes. Under quasi-steady conditions, the net heat transfer rate from the weld pool to the workpiece is estimated from a 3-D numerical heat transfer conduction model. The dimensions of the weld pool used in the computational model are obtained experimentally using a laser vision system and by metallurgical examination. The welding efficiency is then calculated by dividing the net heat transfer rate by the total power input during the experiments. Efficiencies are measured for a range of power inputs and torch speeds and then compared with those available in the literature.
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