中文摘要：

设计了基于超声跨态处理条件下的激光焊接热循环测试试验,分析超声振动对焊接过程的热影响表明,功率超声对焊接过程的热影响主要集中在声学效应、传热学效应及机械搅拌作用三个方面;研究了不同超声振动功率对焊接最高温度、加热速度、高温停留时间以及冷却时间等特征参数的影响规律,并结合功率超声对焊接过程的热影响分析对其本质原因进行了深入研究.结果表明,随超声功率的增加,焊接最高温度和高温停留时间均呈先降低后升高最后再降低的趋势,并且焊接最高温度在超声振动功率为1 200 W左右达到最大值;升温时间呈持续增加的趋势,但不同超声功率所对应的增加速率各不相同,而冷却时间则保持减小趋势.

英文摘要：

Thermal cycle experiments of laser welding with ultrasonic processing across different phases was designed,the analysis of the effect of ultrasonic vibration on welding thermal process showed that the influence of ultrasonic treatment to welding thermal process were mainly consisted of acoustic effect,heat transfer effect and mechanical stirring effect. The influence law of different ultrasonic vibration power to the characteristic temperature parameters includes welding maximum temperature,the heating speed,the high temperature residence time and cooling time was studied. By considering the root cause of the influence of ultrasonic treatment on welding thermal process the results show that the welding maximum temperature and the high temperature residence time both presented a trend that reducing first and then rising and reducing at last with the increase of ultrasonic power,meanwhile,the welding maximum temperature reached maximum when ultrasonic vibration power was 1 200 W.The heating rate kept increasing trend with the increase of ultrasonic power,but the rate of increase corresponding to the differ-ent ultrasonic power were not identical,and the cooling time was kept decreasing.