He Longbiao, Yang Ping, Li Luming, Wu Minsheng
National Institute of Metrology, Beijing 100013, China.
National Institute of Metrology, Beijing 100013, China.
Ultrasonics. 2014 Dec;54(8):2178-83. doi: 10.1016/j.ultras.2014.06.003. Epub 2014 Jun 24.
To solve the difficulty of introducing traditional ultrasonic transducers to welding molten pool, high frequency current is used to modulate plasma arc and ultrasonic wave is excited successfully. The characteristics of the excited ultrasonic field are studied. The results show that the amplitude-frequency response of the ultrasonic emission is flat. The modulating current is the main factor influencing the ultrasonic power and the sound pressure depends on the variation of arc plasma stream force. Experimental study of the welding structure indicates grain refinement by the ultrasonic emission of the modulated arc and the test results showed there should be an energy region for the arc ultrasonic to get best welding joints.
为解决传统超声换能器引入焊接熔池的难题，采用高频电流调制等离子弧，成功激发了超声波。研究了所激发超声场的特性。结果表明，超声发射的幅频响应平坦。调制电流是影响超声功率的主要因素，声压取决于电弧等离子体流力的变化。对焊接结构的实验研究表明，调制电弧的超声发射可细化晶粒，试验结果表明，电弧超声存在一个能获得最佳焊接接头的能量区域。
