Optimizing of Processing Parameters for NC CO₂ Laser Welding of DOGAL 800DP Zinc Coated High Strength Steel

Welding seams were tested and experiment of laser welding of DOGAL 800DP zinc coated high strength steel was performed using orthogonal test method.The optimum processing parameter for numeric control CO2 laser welding of zinc coated high strength steel with 1.5 mm thickness are as follows:adopting N2 as protective gas,coaxial gas feed rate of 3.0 m3·h-1,laser power of 1 300 W,defocusing amount of -0.4 mm,welding speed at 0.8 m·min-1,corner dimension with horizontal direction of side blown gas at 40°,gas feed rate of side blown gas at 2.1 m3·h-1.