高频调制电弧的声学特性及其细化焊缝组织的应用  

The acoustic characteristics of high frequency modulated arc and its application in welding structure refinement

作　　者：何龙标[1] 李路明[2] 吴敏生[2] 

机构地区：[1]中国计量科学研究院,北京100013 [2]清华大学,北京100084

出　　处：《应用声学》2010年第3期222-226,共5页Journal of Applied Acoustics

基　　金：国家自然科学基金(50375080)资助项目

摘　　要：以等离子体电弧作为声源,利用高频电流进行调制,激发电弧可以产生超声波。研究了高频调制电弧的激发特性和声场特征,发现调制电弧所发射超声波在激励频段内呈现平坦的幅频特性,激励电流是影响电弧超声强度的主要因素,声压幅值与电弧等离子体流力的变化量成正比,声场呈现轴向强两侧弱的特征。同时介绍了利用电弧激发超声波在改善焊缝组织性能方面的应用。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 characteristics of the ultrasonic emission is fiat, and that the exciting 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 refinement by the ultrasonic emission of the modulated arc.

关 键 词：高频调制电弧 超声 焊缝组织细化 

分 类 号：TN248.4[电子电信—物理电子学]