低功率YAG激光-MAG电弧复合焊接的研究

本文以低功率YAG激光-MAG电弧复合热源和单脉冲MAG焊接不锈钢为基础，对低功率激光复合焊接中的一些特点进行了初步研究。试验结果表明，焊接速度是复合焊接过程中的一个重要参数，焊接熔深主要由激光的能量决定；低功率复合热源和单MAG焊缝组织都是由奥氏体和枝状的δ-铁素体组成，但在同样的焊接熔深下复合焊接组织晶粒比单MAG焊缝中的晶粒细小；发现复合焊接中由于YAG激光的加入，在激光作用点上方粒子的热运动和电离程度比单MAG焊接强烈；复合焊接电弧等离子体的电子温度和电子密度大于单MAG焊接电弧等离子体的电子温度和电子密度。

The study on low-power YAG laser-MAG arc hybrid welding

This paper studied the low- power YAG laser- MAG arc hybrid welding process of austenitic stainless steel and that was based on the comparison between hybrid welding process and single pulsed MAG arc welding process. In low- power YAG laser- pulsed MAG arc hybrid welding, the welding speed is a important factor, welding penetration is decided by laser energy in hybrid welding. The WB microstructures were composed of columnarγ - austenite and δ- ferrite phase, the crystal grain of hybrid welding seam was smaller than that of single MAG welding seam. Comparing with simple MAG welding case, a zone above laser - heated spot with higher electron temperature and greater electron density is seen in hybrid welding process. Due to the input of YAG laser in hybrid welding process, a nine with higher electron temperature and greater electron density in contrast with simple MAG arc is seen above the laser- heated spot. The thermal motion and ionization of particles of hybrid arc above the laser- heated spot are obviously increased.