双钨极TIG电弧压强分布及其与等离子体喷射的关系

摘要

A three-dimensional (3D) numerical model of a tandem TIG welding is developed to obtain the arc pressure in arc and demonstrate its relation with plasma jet.It has been found that there are high pressure zones in arc:below the electrodes,above the anode,the interchange of two flow of plasma,which is derived from the plasma jet below the cathode.Besides,the maximum pressure calculated on the surface of anode for the tandem TIG arc is smaller than that for the single arc.It built a basis for the application of tandem TIG arc welding.%建立一个三维的统一的双钨极TIG焊模型,利用磁流体动力学理论对双钨极、电弧、阳极三个区域进行统一求解,获到双钨极电弧的压强分布,探究等离子体喷射与对电弧压强的关系.研究发现,双钨极TIG在钨极下方、阳极上方以及两束等离子体流交汇处存在较大的电弧压强,这些高压区的形成与等离子体喷射存在因果关系.计算发现,双钨极TIG焊在阳极表面上的最大压强远小于单钨极TIG焊的,这为双钨极TIG焊的应用提供了一些理论基础.