基于响应面法的DP800车用高强钢激光-电弧复合焊接焊缝成形研究

Study on Weld Formation of Laser-Arc Hybrid Welding of DP800 Automotive High Strength Steel Based on Response Surface Method

为了优化DP800车用高强钢复合焊接的焊缝成形和工艺参数,基于响应面法建立了激光-电弧复合焊接主要工艺参数与焊缝特征参数之间的数学模型,并进行了方差分析。以特定熔深和最小化熔宽为目标,对激光功率、焊接电流、焊接速度进行了优化,得到最优工艺参数,并进行了试验验证。研究结果表明:激光功率和焊接电流与焊缝熔深呈正相关,焊接速度与焊缝熔深呈负相关;随着焊接电流的增加或焊接速度的降低,焊缝熔宽逐渐增大,激光功率几乎不对熔宽产生影响。在最优工艺参数下通过试验验证了模型的准确性,熔深和熔宽的误差率均在5%以内。

In order to optimize the weld formation and process parameters of DP800 vehicle high strength steel composite welding,based on the response surface method,the mathematical model between the main process parameters and weld characteristic parameters of laser-arc hybrid welding is established,and the analysis of variance is carried out.Aiming at specific penetration depth and minimum penetration width,the laser power,welding current and welding speed are optimized to obtain the optimal process parameters,which are verified by experiments.Results show that laser power and welding current are positively correlated with weld penetration,and welding speed is negatively correlated with weld penetration.With the increase of welding current or the decrease of welding speed,the weld width increases gradually,and the laser power has little effect on the weld width.The accuracy of the model is verified by experiments under the optimal process parameters,and the error rates of penetration depth and width are less than 5%.