峰值功率和脉冲宽度对激光焊接质量的影响

Effects of Peak Power and Pulse Width on Laser Welding Quality

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 finite element method,the peak power and pulse width were took as parameters,a finite element model on laser welding of 304 stainless steel sheet was established,and a transient heat analysis was did,influence rules of various parameters on the weld pool shape and temperature were obtained.Based on orthogonal experimental design,the influence extent of various parameters on the weld pool shape and temperature were analyzed,and the optimal parameters combination was obtained.Results indicate that with the peak power and pulse width increase,the bead width,weld depth,ratio of the weld depth to the bead width and weld pool temperature increase,when the peak power achieves 280 W and the pulse width is greater than or equal to 4 ms,the weld pool temperature exceeds the boiling point;The peak power has larger influence than the pulse width on the weld pool shape and temperature,the optimal parameters combination is that the peak power is 240 W and the pulse width is 5 ms.These analysis results could provide theoretical basis and technical guidance for the selection of technological parameters on laser welding of 304 stainless steel.