Study on influence of tungsten electrode spacing on arc characteristics of twin-tungsten electrode TIG welding
A three-dimensional steady state mathematical model was established for the TIG welding arc.The control equations were solved iteratively by assumptions and boundary conditions,and the arc characteristics under different tungsten electrode spacing were analyzed.The arc temperature,plasma velocity and arc pressure were discussed by comparing with single tungsten electrode TIG arc.By analyzing the arc characteristics of different tungsten electrode spacing,the variation rules of arc shape,electromagnetic force and arc pressure were discussed.The results show that the coupling arc shape of twin-tungsten TIG welding is asymmetrically distributed.Compared with single tungsten electrode TIG welding,the arc temperature,plasma velocity and arc pressure can be greatly reduced,and the arc pressure changes slowly in the vertical direction of the two tungsten electrodes.With the increase of tungsten electrode spacing,the interaction force between arcs becomes weaker,and the coupling arc gradually separates into two separate arcs.The direction of the electromagnetic force gradually shifts from the arc center to both sides,and the electromagnetic force gradually decreases.The arc pressure gradually changes from unimodal to bimodal distribution,and the maximum arc pressure drops first and then rises.
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