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本文提出了电触点电阻钎焊的电热耦合有限元模型,数值分析了电极导热系数对电触点电阻钎焊焊接质量的影响。结果表明:当紫铜电极导热系数增大倍数而不超过5倍时,紫铜上部电极尖端的温度降低,这样就可减少紫铜电极的软化,减少上部紫铜电极与工件之间的粘附,减少上电极尖端的变形,从而减少了虚焊的发生,又不会对电触点的钎焊质量造成影响。当紫铜电极导热系数增大幅度超过这一范围时,焊接面温度分布明显变得不均衡,电触头焊接质量也会大大降低,且焊接时间是原来的1倍以上,大大降低了电阻钎焊的加工效率。这说明,导热系数相对高些的电极有助于降低电极与待焊工件之间粘连、电触头组件虚焊的概率,因此,我们可通过调整电极导热系数来提高电触头组件的焊接质量。
In this paper, the electrothermal coupling finite element model of the electrical contact resistance brazing is proposed. The influence of the electrode thermal conductivity on the quality of the electrical contact resistance brazing welding is analyzed numerically. The results show that when the thermal conductivity of the copper electrode increases by a multiple of not more than 5 times, the temperature of the tip of the copper upper electrode decreases, which can reduce the softening of the copper electrode, reduce the adhesion between the upper copper electrode and the workpiece, reduce the upper electrode Cutting-edge deformation, thereby reducing the occurrence of Weld, without affecting the quality of the electrical contact brazing. When the thermal conductivity of copper electrode increases more than this range, the temperature distribution of the welding surface obviously becomes unbalanced, the welding quality of the electrical contact will be greatly reduced, and the welding time is more than doubled, greatly reducing the resistance brazing Processing efficiency. This shows that the relatively high thermal conductivity of the electrode helps to reduce the electrode and the workpiece to be welded adhesion, the probability of virtual welding of electrical contact components, therefore, we can improve the electrode thermal conductivity of the electrode to improve the welding quality .