Numerical analysis of flow-thermal coupling in micro-plasma welding pool of thin-wall part

The formed characteristics of thin-wall part is studied when it is in the process of MPAW.Finite element method is used to simulate the temperature fiell coupling flow field in the welding of thin-wall part.It is found that hecause of the obvious effect of heat accumulation in cross-section,where the distribution of temperature fielt area presents trapezoidal inverted approximately in the molten pool and the non-molten pool area presents level.The surface tension,the electromagnetic force and buoyancy are considered for analyzing the effects on the fluid flow of welding-pool.It can be obtained that the surface tension is the main driving foree in the welding pool,which is far greater than electromagnetic foree and buoyancy.