Abstract
AbstractThree-dimensional time dependent governing equations in non-orthogonal body fitted curvilinear coordinate system for analysis of variable polarity plasma arc welding (VPPAW) process were established. The numerical analysis of VPPAW process for aluminium alloy LF6 was conducted via the developed models, which laid a foundation to guide procedure optimisation for VPPAW process. Functions between temperature and thermophysical properties for aluminium alloy LF6 were established. Fluid flow field, thermophysical properties, temperature field and free surface deformation of the keyhole weld pool were coupled into computation. Effect of wire filling on the geometry of the molten pool and double sided weld reinforcements was considered in the simulation. Dynamic evolutions of geometrical dimensions versus time for both weld pool and keyhole were simulated through the developed computational routines. Moreover, effects of welding current, travel speed and also heat input on geometry and dimensions of the ...
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