激光—双丝复合焊接电弧等离子体温度计算及耦合机理分析

采用光纤式光谱仪，对激光—双丝脉冲MIG复合焊接电弧等离子体辐射规律进行探讨，结合焊接过程中的高速摄像图片探讨激光与电弧的耦合机理，并运用Boltzmann图法计算出电弧等离子体的电子温度。结果表明，加入激光后，电弧的亮度提高，辐射增强，电弧偏向激光作用位置，同时电弧收紧，电弧截面减小，电弧稳定性增强;激光功率、焊接电流和焊丝间距对电弧等离子体温度有比较大的影响，随着激光功率的增加、焊接电流增大和焊丝间距的减小，电弧等离子体电子温度升高。

Plasma Temperature Calculation and Coupling Mechanism Analysis of Laser-Double Wire Hybrid Welding

The plasma radiation of laser-double wire hybrid welding was collected by using fiber spectrometer, the coupling mechanism of arc with laser was studied through high-speed photography during welding process, and the temperature of hybrid plasma was calculated by using the method of Boltzmann plot. The results indicated that with laser hybrid, luminance was enhanced; radiation intensity became stronger; arc was attracted to the laser point; cross section contracted and arc was more stable. The laser power, welding current and arc-arc distance are important factors that have great influence on electron temperature. Increase in the laser power, amplification of welding current and reduction of arc-arc distance can all result in the rise of temperature.