弧焊熔滴过渡的高速摄像与电信号测试分析

针对焊接熔滴过渡频率高、难以观察的特点，以焊接电流、电弧电压、熔滴过渡图像为信息源，建立了高速摄像与电信号小波分析系统，论文阐述该系统的构成并分析系统构建中的关键技术，利用该系统对自行研制的脉冲MIG焊电源熔滴过渡信号进行了测试与分析。结果表明，脉冲MIG焊短路过渡发生时，电弧电压信号、弧焊电流信号发生突变，有明显的特征变化，可直接用于过程控制；而射流过渡、射滴过渡发生时，电弧电压信号、弧焊电流信号变化平稳，没有明显的特征变化，可通过提取熔滴特征信息用于过程检测和质量控制。

Testing and Analyzing of High-speed Video and Electrical Signals in Metal Transfer of Arc Welding

Due to the difficulties of observing fast changing process of melted drop transition, a proper high-speed video system with electrical signals wavelet analyzing in synchronism is established for recording the welding process. Structure of the system and the key techniques are introduced. The welding current, the arc voltage and the melted drop pictures in metal transfer of pulse MIG welding is collected and analyzed. The experimental results show: when short current transition occurs, the obvious changing characteristics of the pulse MIG welding current wave and arc voltage wave can be applied to control the welding quality directly; when spray transition occurs, the smooth wave of the pulse MIG welding current and arc voltage can not be used to control the welding quality directly, whereas the obtained characteristics of the melted drop can be used for the welding process analyse and quanlity control.