基于计算机仿真的双钨极间接气体保护焊接电弧参数分布

Research on arc parameters distribution of twin-tungsten indirect gas shielded welding based on the computer simulation

采用计算机仿真方法、针对间接电弧的参数分布特点对双钨极间接气体保护焊进行了数值模拟研究。该焊接方法节能、高效且焊接工件的变形小,但热输入却很低。为了分析其热输入较低的原因,首先利用有限元软件建立了间接电弧的有限元模型,并计算电弧的一系列特征参数,并与实测结果进行对比。结果表明:双钨极间接电弧具有面对称特征,且电弧偏向阳极方向,呈倒钟罩形态。阴极区电弧参数均小于阳极区。与等离子弧焊和钨极惰性气体保护焊(TIG)相比,在该焊接方法中被焊工件并不与电极相连,主要靠弧柱区端部加热,该区域较低的电弧压力、热流密度和等离子体流速使得工件的热输入低,且熔深浅。

According to parameters distribution of indirect arc, numerical simulation method was adopted to study the twin-tungsten indirect gas shielded welding. This welding method saves energy with high efficiency ,and the welding deformation is small ,but the heat input is very low. In order to analyze the cause of the relatively low heat input, the finite element model of indirect arc is first established by the finite element software, and a series of characteristic parameters are calculated and compared with the measured results. The Results show that the twin-tungsten indirect gas shielded welding shows the plane symmetry feature. The arc turns to the anode area with the inverted bell shape. Arc parameters values of the cathode area are less than that of the anode area. Compared with plasma arc welding and tungsten inert gas welding （TIG）, the workpieces are not connected to the electrode during welding, and heated mainly by arc column area with low pressure,heat flux density and plasma arc velocity,which lead to low heat input and melting depth of the workpieces.