2195铝锂合金焊接缺陷固相准等强修复技术  

Solid state quasi-equal strength repairing for welding defects of 2195 Al-Li alloys

作　　者：刘立安[1] 陈思浩 赵耀邦[1] 孟祥晨[2] 黄永宪[2] Liu Li’an;Chen Sihao;Zhao Yaobang;Meng Xiangchen;Huang Yongxian(Shanghai Aerospace Precision Machinery Institute,Shanghai 201600,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]上海航天精密机械研究所,上海201600 [2]先进焊接与连接国家重点实验室,哈尔滨工业大学,哈尔滨150001

出　　处：《焊接》2021年第6期24-27,62,63,共6页Welding & Joining

基　　金：中国航天科技集团有限公司第八研究院产学研合作基金(SAST2020-108);黑龙江省博士后面上资助(LBH-Z20055)。

摘　　要：针对2195铝锂合金搅拌摩擦焊(Friction stir welding,FSW)焊后匙孔缺陷,采用填充式搅拌摩擦焊(Filling friction stir welding,FFSW)开展固相准等强修复。该方法热输入低,界面处材料相互挤压,摩擦充足,材料流动混合充分,界面结合质量高。结果表明,通过额外填充棒的引入,匙孔缺陷得到有效填充,且搅拌摩擦处理有利于对修复区域的二次顶锻,促进修复界面的冶金结合效果。通过焊接工艺参数优化,当旋转速度为1600 r/min时,修复后接头的抗拉强度为358.1 MPa,达到了优质FSW接头的90.7%;断后伸长率为3.17%,达到了优质FSW接头的90.6%,实现了2195铝锂合金的固相准等强修复。Aiming at the keyhole defects after friction stir welding(FSW)of 2195 Al-Li alloys,the solid state quasi-equal strength repairing based on filling friction stir welding(FFSW)was performed.This method was characterized by low heat input,sufficient friction and material flow and high strength of interfacial bonding.The results showed that introducing the additional filling stud could make the sufficient filling of the keyhole,while the friction stir processing was beneficial to the second forging effects on the repairing regions.By optimizing the welding parameters,when the rotating velocity was 1600 r/min,the tensile strength of the repaired joint was 358.1 MPa,up to 90.7%that of high quality FSW joint,while its elongation was 3.17%,up to 90.6%that of high quality FSW joint.It realized the solid state quasi-equal strength repairing of 2195 Al-Li alloys.

关 键 词：2195铝锂合金 填充式搅拌摩擦焊 匙孔修复 界面结合 

分 类 号：TG453[金属学及工艺—焊接]