交流TIG电弧过零时段的时间-能量分布特征  

Characteristic of time-energy distribution at current-zero period on AC TIG welding arc

作　　者：杨晓红[1] 宋永伦[1] 胡坤平[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《焊接学报》2009年第2期21-24,共4页Transactions of The China Welding Institution

基　　金：国家自然科学资金项目(50375005)

摘　　要：借助于高时间分辨率的增强型CCD光谱分析系统,对交流TIG电弧在方波、梯形波、正弦波3种波形条件下不同过零速度的发射光谱进行了观测与分析,应用谱线Stark展宽理论计算得到了电子密度及其时间的变化.结果表明,对应于不同电流波形的电子密度在过零时段表现出一种滞后现象,并且滞后时间与电流过零速率、能量输入以及电弧输入功率变化率有关,探讨了焊接弧源系统能量转换过程中的非傅里叶效应的存在及其条件.Based on high-time-resolution spectral instruments with an image-intensified charge-coupled detector,emission spectra of AC TIG welding arc under different conditions of current wave forms,such as square wave,trapezoidal wave and sine wave,were investigated and analyzed.The dependence of electron density on time was obtained using the theory of spectral line Stark broadening.The experimental results show that there is a time delay for electron density alone with welding current crossing the zero point.It is discussed,furthermore,that the delay-time has relationship with velocity of current,energy input and the rate of change of arc input power with respect to time nearby zero point.Thus,non-Fourier effect is revealed and the condition of existence is discussed during thermal energy transport of the arc-power system.

关 键 词：交流TIG电弧 光谱诊断 电子密度 滞后时间 非傅里叶效应 

分 类 号：TG115.28[金属学及工艺—物理冶金]