铝合金超声波钎焊过程中液态钎料的填缝及界面润湿行为

Filling and Wetting Behaviors of Liquid Filler Metal in the Process of Ultrasonic Soldering of Aluminum Alloy

研究了超声波振动作用下6061Al和2024Al合金焊缝中液态钎料的填缝过程,并分析了加热温度、焊缝预留间隙值对该过程的影响。结果表明,超声波振动作用下液态钎料的填缝行为与传统毛细填缝行为有很大差别,该条件下液态钎料在不润湿母材的基础上就迅速发生填缝过程,钎料初始液-气界面为凸状;随着填缝进行,填缝速度有所下降,填缝前沿钎料/母材界面润湿程度提高,钎料液-气界面形状转变为凹状。加热温度对超声波作用下液态钎料的填缝过程无明显影响,焊缝预留间隙值增加,钎料填缝长度减小,液-气界面形态发生变化。

Filling of liquid filler metal into the joint clearance of 6061Al and 2024Al alloys under the action of ultrasonic vibration was investigated.The effects of heating temperature and joint clearance value on the filling process were concerned with.The results show that the filling of liquid filler metal under the action of ultrasonic vibration is quite different from that induced by the traditional capillary effect.The non-wetting liquid filler fills rapidly into the joint clearance once the ultrasonic vibration is applied and the morphology of the liquid-gas interface appears convex at the initiate stage.With the development of the filling process,the filling velocity decreases and the wetting between the liquid filler and the base metal at the filling front is improved,giving rise of the transition of the morphology of the liquid-gas interface from convex to concave.Heating temperature shows no obvious influence on the filling process.The filling length decreases and the morphology of liquid-gas interface tend to change with the joint clearance increase.