论文部分内容阅读
超声复合电弧作为一种新的焊接热源,在电弧焊接过程中可利用超声实现对熔融金属的深度处理,但是超声与电弧等离子体间相互作用机理还不清晰,这成为阻碍该技术工程应用的关键问题.本文通过实验与相应理论针对外加超声场对焊接电弧调控特性进行了研究.为说明电弧特性,针对试验中高速摄像采集的电弧图片进行了处理.对比未加超声情况,超声复合电弧受内外声场共同作用等离子体拘束程度明显提高,电弧亮度增强,弧柱高温区范围扩展至阳极,中间粒子出现团聚并以一定频率上下抖动.通过改变超声激励电流大小和声发射端高度,电弧结构产生显著变化,在谐振点附近,电弧挺直度最强,脉动频率最大.试验结果显示通过外加超声可以达到对焊接电弧热等离子体调控的目的.最后结合波动方程和二维声边界元模型,分析了电弧内部声传播过程以及声场结构对等离子体粒子的作用规律,这为进一步理解超声对电弧的调控机理打下良好基础.
Ultrasonic composite arc as a new welding heat source can be used to process the molten metal during ultrasonic welding. However, the mechanism of the interaction between ultrasonic and arc plasma is unclear, which is the key to hinder the application of this technology Problem.In this paper, the experimental study and the corresponding theory of applied ultrasonic field on the welding arc control characteristics were studied.In order to illustrate the arc characteristics, for the test of high-speed video capture arc images were processed.Compared with no ultrasonic case, ultrasonic composite arc by internal and external The interaction between the sound field and plasma is significantly enhanced, the brightness of the arc is enhanced, the high temperature range of the arc column is extended to the anode, the middle particles are agglomerated and jitter up and down at a certain frequency, and the structure of the arc is significantly changed by changing the size of the ultrasonic excitation current and the height of the sound emitting end The results show that the ultrasonic welding can achieve the purpose of controlling the thermal plasma of welding arc.Finally, combining the wave equation and two-dimensional acoustic boundary element model, Internal acoustic arc propagation process and sound field structure equivalent Ion particles of the law of action, which for further understanding of ultrasonic regulation of the arc laid a good foundation.