采用激光-MAG复合焊接10 mm厚的Q345B钢板, 利用多元线性回归的方法分析得到了激光功率、MAG电流、离焦量和焊接速度对焊缝熔深及熔宽的影响。利用MATLAB算法优化该模型并得到了最优的焊接工艺参数组合。实验结果表明, 当激光功率为3 kW、电流为320 A、离焦量为-2 mm、焊接速度为8.3 mm/s时, 焊缝的熔深熔宽比达到最大, 验证所求的结果与实际值相差不超过5%, 该数学模型可以有效的预测焊接质量。

Welding 10 mm Q345B steel plate by using laser-MAG hybrid welding, the effects of laser power, MAG current, defocusing amount and welding speed on weld penetration and width were analyzed by multiple linear regression method. The MATLAB algorithm was used to optimize the model and get the best combination of welding process parameters. The experimental results show that when the laser power is 3 kW, the current is 320 A, the defocusing amount is-2 mm, and the welding speed is 8.3 mm/s, the weld penetration width ratio is maximized, and the verification result is not more than 5% from the actual value, the mathematical model can effectively predict the welding quality.