基于响应面法7A52高强铝合金FSW接头抗拉强度预测及优化  

Prediction and optimization of tensile strength of 7A52 aluminum alloy friction stir welding joints based on response surface methodology

作　　者：范文学[1] 陈芙蓉[1] FAN Wenxue;CHEN Furong(Inner Mongolia University of Technology,Hohhot,010051,China)

机构地区：[1]内蒙古工业大学,呼和浩特010051

出　　处：《焊接学报》2021年第9期55-60,I0004,共7页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51765053);内蒙古自治区高等学校科学研究项目(NJZZ21020);内蒙古工业大学校级项目(ZD201721).

摘　　要：为了研究7A52铝合金搅拌摩擦焊的焊接速度、搅拌头转速及轴肩压深对接头抗拉强度的影响,采用响应面法的中心复合试验设计法设计20组试验,并建立抗拉强度响应函数关系式.为了验证响应函数关系式的精确性,通过方差分析和回归分析确定该回归模型为显性,相关性系数R^(2)的偏差为3.17%.通过单一焊接参数因素和双因素焊接参数对抗拉强度的影响分析,进一步验证了模型的准确性,最后通过拉伸试验验证.结果表明,基于响应面法拟合的搅拌摩擦焊焊接速度、搅拌头转速及轴肩压深与接头抗拉强度响应函数关系式能精确的预算不同焊接参数组合所对应的接头抗拉强度,并获得接头最佳参数组合为焊接速度110 mm/min、搅拌头转速1436 r/min和轴肩压深0.55 mm,得到最大预测抗拉强度为380 MPa.创新点:把响应面法应用到焊接工艺参数优化组合的分析中,以较少的试验获得最佳的焊接工艺参数.In order to study the effects of welding speed,stirring head rotation speed and pressure deep of shaft shoulder on tensile strength of 7A52 aluminum alloy friction stir welding.20 groups of tests were designed by response surface methodology based on central composite test design,and response function relationship were established.In order to verify the accuracy of the response function relationship,variance analysis and regression analysis were used to determine the dominance of the regression model,and the deviation of correlation coefficient R^(2) was only 3.17%.The accuracy of the model was verified by analyzing the influence of single welding parameter and double welding parameter on tensile strength.Finally,the model was verified by tensile test.The results show that the joint tensile strength can be predicated based on response function relationship of response surface methodology fitting,and the best combination of welding parameter(welding speed 110 mm/min,stirring head rotation speed 1436 r/min,pressure deep of shaft shoulder 0.55 mm)was gained.The maximum predication tensile strength was 380 MPa.

关 键 词：搅拌摩擦焊 7A52铝合金 响应面法 抗拉强度 

分 类 号：TG456.7[金属学及工艺—焊接]