基于响应面法的5052铝合金搅拌摩擦焊接工艺参数研究

目的 建立搅拌摩擦焊接工艺参数与焊接接头抗拉强度之间关系的响应曲面模型，并依此模型研究焊接工艺参数变化对接头抗拉强度所产生的影响，得到最佳工艺参数，提高焊接接头强度。方法 以5052-H112铝合金为研究对象，基于响应面法优化设计试验方法，以转速、焊接速度、轴肩压入深度为因素，焊接接头的抗拉强度为响应值设计试验，建立对应的响应函数与回归模型，对模型进行方差分析，根据模型得到最佳工艺参数值，并与试验结果作比较。结果 成功建立了响应模型，在分析模型和试验验证后发现，在选定的工艺参数范围内，当转速为737 r/min、焊接速度为60 mm/min、轴肩压入深度为0.3mm时，接头抗拉强度达到最优值227MPa。结论 通过响应面分析得到，转速和焊接速度对抗拉强度的影响最大，且两者交互作用显著，在给定范围内随着转速和焊接速度的提高，抗拉强度增大至峰值后下降，轴肩压入深度单独对接头抗拉强度的影响较小，其与转速交互影响显著。通过响应曲面法优化后的焊接工艺参数明显提高了5052-H112铝合金搅拌摩擦焊焊接头抗拉强度。

Process Parameters of 5052 Aluminum Alloy Friction Stir Welding Based on Response Surface Method

The work aims to establish a response surface model of the relationship between the friction stir welding process parameters and the tensile strength of friction stir welded joints, and analyze the effects of the changes of welding process parameters on the tensile strength of joints, to obtain the best process parameters and improve the strength of welded joints. With 5052-H112 aluminum alloy as the research object, with rotating speed, welding speed, shaft shoulder pressing depth as factors, and with welded joint tensile strength as the response value, the experiment was designed based on the response surface method optimization design experiment method. The corresponding response function and regression model were established for variance analysis. The best process parameters obtained from the model were compared with the experimental results. Finally, the mathematical model was established successfully. After the analysis of the model and the test verification, it was found that the optimal joint tensile strength was 227 MPa when the rotating speed was 737 r/min, the welding speed was 60 mm/min and the shaft shoulder pressing depth was 0.3 mm in the selected process parameters. The conclusion can be obtained from response surface analysis that rotating speed and welding speed have the greatest influence on tensile strength, and the interaction between the two is significant. In a given range, with the increase of rotating speed and welding speed, the tensile strength increases to the peak and then decreases. The depth of shoulder pressing has a small influence on the tensile strength of the joint alone, and the interaction effect with the speed is significant. The welding parameters optimized by response surface method can obviously improve the tensile strength of 5052-H112 aluminum alloy friction stir welded joint.