电极导热系数对电触头组件焊接质量的影响

发布时间：2018-11-28 20:17

【摘要】：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。
[Abstract]:In this paper, the electrothermal coupling finite element model of electric contact resistance brazing is proposed, and the influence of electrode thermal conductivity on the welding quality of electric contact resistance brazing is numerically analyzed. The results show that when the thermal conductivity of the copper electrode increases by less than 5 times, the temperature at the tip of the copper electrode decreases, thus reducing the softening of the copper electrode and the adhesion between the upper copper electrode and the workpiece. The deformation at the tip of the electrode is reduced, thus the occurrence of virtual welding is reduced, and the soldering quality of electric contact is not affected. When the thermal conductivity of the copper electrode exceeds this range, the temperature distribution of the welding surface becomes unbalanced obviously, and the welding quality of the electric contact will be greatly reduced, and the welding time is more than twice that of the original one. The processing efficiency of resistance brazing is greatly reduced. This shows that the electrode with relatively high thermal conductivity is helpful to reduce the adhesion between the electrode and the workpiece to be welded and the probability of virtual welding of the electric contact assembly. Therefore, we can improve the welding quality of the electrical contact assembly by adjusting the thermal conductivity of the electrode.
【作者单位】：浙江大学材料科学与工程博士后科研流动站;温州宏丰电工合金股份有限公司;
【分类号】：TM503.5;TG454

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