基于正交试验设计的汽车消声器焊接工艺优化

Welding process optimization of automotive muffler based on orthogonal experimental design

针对汽车消声器结构的特点,研究了前消总成中催化器总成环焊缝的特点。文中运用正交试验设计方法,以焊接残余应力为评价指标,对催化器总成焊接的工艺参数进行优化设计,然后采用有限元模拟软件Marc对最优焊接工艺的焊接残余应力进行数值模拟,获得了催化器总成焊接环焊缝的残余应力分布情况。结果表明,电弧电压对焊接残余应力影响最为显著,其次为气体输出流量、焊接速度、焊接电流和焊丝直径等。研究结果为优化消声器焊接工艺、有效控制焊接残余应力提供了参考。

According to the characteristics of the automobile muffler structure,the characteristics of the catalytic converter assembly girth weld in the front general assembly were studied. The method of orthogonal experiment design was used to optimize the catalytic converter assembly welding process by taking the welding residual stress as evaluation index. The finite element simulation software Marc was used to simulate the welding residual stress of the optimal welding process,and the residual stress distribution of the welded joint of the catalytic converter assembly was obtained. The results showed that the arc voltage has the most significant influence on welding residual stress,and the influencing factors are the gas output flow,welding speed,welding current and wire diameter in turn. The research results provide a reference for optimizing muffler welding process and effectively controlling the welding residual stress.