论文部分内容阅读
基于有限元法,以峰值功率和脉冲宽度为参数,建立了304不锈钢薄板激光焊接有限元模型,并进行瞬态热分析,获得了各参数对熔池形状和温度的影响规律。基于正交试验设计,分析了各参数对熔池形状和温度的影响程度,并得出最优参数组合。结果表明:随着峰值功率和脉冲宽度的增加,熔宽、熔深、深宽比和熔池温度增加,当峰值功率为280 W,脉冲宽度大于或等于4 ms时,熔池温度超过材料沸点;峰值功率对熔池形状和温度的影响较脉冲宽度大,最优参数组合为峰值功率为240 W,脉冲宽度为5 ms。分析结果可为激光焊接304不锈钢工艺参数的选择提供理论依据和技术指导。
Based on the finite element method, the finite element model of laser welded 304 stainless steel sheet was set up based on the peak power and pulse width, and the transient thermal analysis was carried out. The influence of each parameter on the shape and temperature of the molten pool was obtained. Based on orthogonal experimental design, the influence of each parameter on the shape and temperature of the weld pool was analyzed and the optimal combination of parameters was obtained. The results show that with the increase of peak power and pulse width, the melting width, penetration depth, aspect ratio and bath temperature increase. When the peak power is 280 W and the pulse width is greater than or equal to 4 ms, the bath temperature exceeds the boiling point of the material The influence of peak power on the shape and temperature of the weld pool is larger than that of the pulse width. The optimal combination of parameters is the peak power of 240 W and the pulse width of 5 ms. The results of the analysis can provide theoretical basis and technical guidance for the selection of 304 stainless steel laser welding parameters.