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高频调制电弧的声学特性及其细化焊缝组织的应用
引用本文:何龙标,李路明,吴敏生.高频调制电弧的声学特性及其细化焊缝组织的应用[J].应用声学,2010,29(3):222-226.
作者姓名:何龙标  李路明  吴敏生
作者单位:1. 中国计量科学研究院,北京,100013
2. 清华大学,北京,100084
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。

关 键 词:高频调制电弧  超声  焊缝组织细化

The acoustic characteristics of high frequency modulated arc and its application in welding structure refinement
HE Long-Biao,LI Lu-Ming and WU Min-Sheng.The acoustic characteristics of high frequency modulated arc and its application in welding structure refinement[J].Applied Acoustics,2010,29(3):222-226.
Authors:HE Long-Biao  LI Lu-Ming and WU Min-Sheng
Institution:1 National Institute of Metrology, Beijing 100013) (2 Tsinghua University, Beijing 100084)
Abstract: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 flat, 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 refmement by the ultrasonic emission of the modulated arc.
Keywords:High frequency modulated arc  Ultrasonic  Welding structure refinement
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