不锈钢脉冲激光/TIG复合焊接过程中焊接参数对焊缝形貌及热效率的影响

Effects of major welding parameters on the weld geometry and heat transfer efficiency are investigated for pulsed Nd:YAG laser/TIG hybrid welding of 304 stainless steel plate. The results show that cross sectional area of hybrid weld is larger that the sum of cross sectional area of laser weld and that of TIG weld, which means synergetic effect occurs during hybrid welding process. Weld width, weld depth, weld cross sectional area and heat transfer efficiency increase with the increase of laser power. When defocusing distance increase from -3mm to 5mm, weld width, weld depth, weld cross sectional area and heat transfer efficiency would increase and reach the maximum when defocusing distance is -1mm, and then decrease with the further increasing of defocusing distance. There exits an optimum laser-arc distance and Weld width, weld depth, weld cross sectional area and heat transfer efficiency increase and heat transfer efficiency would get their maximum at this optimum laser-arc distance. With the decreasing of welding speed, weld width, weld depth and weld cross sectional area would increase and heat transfer efficiency would decrease.