基于响应曲面法的涡轮增压器废气阀门激光焊接工艺优化研究

Research on Laser Welding Process Optimization of Turbocharger Waste⁃gate Based on Response Surface Methodology

激光焊接技术凭借其高效、高精度的特点已广泛应用在汽车制造产业,在涡轮增压器的生产中,激光焊接也逐步被应用于实现废气阀门与阀杆的连接。虽然当前对于激光焊接的工艺研究很多,但对工艺参数的优化也一直缺少一个科学有效的方法。本文以熔接深度、熔接宽度和内部缺陷作为响应变量,选取焊接功率、焊接速度作为因子,运用响应曲面法(RSM)设计实验方案,通过对响应结果进行分析,研究焊接参数对焊接质量的影响,拟合能够预测最优参数的数学模型,最终将获得的最优参数运用到生产中进行验证。

Laser welding technology with its high efficiency,high precision has been widely used in automobile manufacturing industry.In the production of turbocharger,laser welding has been gradually applied to realize the connection between waste⁃gate and lever.Although there are a lot of laser welding process research,but the optimization of process parameters has been lack of a scientific and effective method.In this paper,taking weld depth,weld width and the internal defects as response variables,se⁃lecting welding power,welding speed as factors,the response surface method(RSM)was used to design the test scheme.According to contrast test result,the effects of process parameters on welding quality was studied.A mathematical model which could optimize process parameters was proposed.Finally,the optimized parameters were proved valid in production.