基于响应面法的超高频电弧增材制造工艺优化

Optimization of UHFP-GTAW process based on response surface method

采用响应面法对超高频电弧增材制造工艺(UHFP-GTAW)进行了优化.通过建立函数关系得到了焊缝尺寸关于焊接电流、送丝速度及焊接速度的多元二次回归模型,并运用方差分析验证了回归模型的可靠性.设置优化条件选取了相应的焊接参数,并将焊缝尺寸的预测结果与试验结果进行了对比.结果表明,模型预测尺寸与实际试验测得的焊缝尺寸误差分别为焊缝宽度5.4%和焊层高度6.6%.对沉积成形的GH4169高温合金薄壁构件分别进行了水平方向和垂直方向的拉伸力学性能测试,其强度极限分别达到1130.93和1126.04 MPa,断后伸长率分别为18.1%和16.56%,断面收缩率分别达到20.6%和20.2%.

The ultra-high frequency pulsed gas tungsten arc welding process was optimized by response surface method(RSM).By establishing the functional relation,the regression model of weld bead size on welding current(Ib),wire feed speed(WFS)and travel speed(TS)is obtained,and the reliability of the regression model is verified by variance analysis.The corresponding welding parameters are selected by setting the optimization conditions and the size of weld bead is predicted.The error between the predicted size from the model and the actual size is 5.4%of bead width and 6.6%of bead height,respectively.After the deposition of thin-wall GH4169 superalloy part,the mechanical properties are tested,including the horizontal and vertical tensile properties,the ultimate strength are 1130.93 MPa and 1126.04 MPa,respectively,the elongation rate are 18.1%and 16.56%,respectively,the reduction of area are 20.6%and 20.2%,respectively.