基于灰色关联的DP1180/DP590异质点焊接头工艺参数优化

Multi-objective optimization of resistance spot welding parameters for DP1180/DP590 using grey relational analysis based Taguchi

以正交试验为基础,利用灰色关联度研究了不等厚异质点焊接头的多目标优化,通过极差分析得到以熔核直径、压痕率和最大拉剪力为衡量因子的最优参数,通过方差分析研究了各点焊参数对衡量因子的影响程度。结果表明:1.2mm的DP1180和1.5mm的DP590异质点焊接头最优工艺参数是:焊接电流为9.5kA、焊接时间为22cycles、电极压力为8.48kN,此时点焊接头的熔核直径为6.76mm、压痕率为17.70%、最大拉剪力为19.49kN,在保证点焊接头强度的同时降低了压痕率。点焊参数对衡量因子影响的主次顺序为焊接电流、焊接时间和电极压力。

Based on Taguchi orthogonal test,the multi-objective optimization problem of dissimilar thickness DP1180/DP590 resistance spot welding was studied using grey relation analysis.The optimum parameters were derived by considering the responses such as nugget diameter,indentation rate and lower peak load by difference analysis.Analysis of variance（ANOVA）was used to analyze the effects of different parameters on the responses.Based on the results,welding current 9.5 kA,welding time 22 cycles and electrode force 8.48 kN evolved as the optimized parameters.Under the optimized parameters,the nugget diameter,indentation rate and peak load of the spot joint are 6.67 mm,17.70% and 19.49 kN,respectively.The joint in with the optimized parameters ensures the strength and reduces the indentation rate.The influence degrees of the spot welding parameters on the measuring factors are in the order：welding current,welding time and electrode force.