轴肩辅助加热6082铝合金摩擦塞补焊接头组织及力学性能  

Microstructure and mechanical properties of friction plug repair welding joint by shoulder auxiliary heating for 6082 aluminum alloy

作　　者：李德福 王希靖[1,2] 赵早龙[2] 徐秋苹 LI Defu;WANG Xijing;ZHAO Zaolong;XU Qiuping(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou,730050,China;Lanzhou University of Technology,Lanzhou,730050,China;Lanzhou Jiaotong University,Lanzhou,730070,China)

机构地区：[1]兰州理工大学,省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学,兰州730050 [3]兰州交通大学,兰州730070

出　　处：《焊接学报》2022年第1期36-41,I0005,共7页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(04008011);甘肃省高等学校创新基金项目(2021A-045)。

摘　　要：为了解决搅拌摩擦焊匙孔类体积型缺陷修复问题,在填充式搅拌摩擦焊基础上,采用轴肩与母材摩擦辅助加热的方法对同种材料铝合金匙孔类缺陷进行摩擦塞补焊,在不同的塞棒转速下得到了成形良好的塞补焊接头.结果表明,由于热输入和材料形变作用,接头不同区域组织发生了明显变化.不同塞棒转速下接头组织及分布状态相似.一个完整的塞补焊接头可分为焊核区、填充区、结合面区、轴肩影响区、热力影响区和热影响区6个部分.焊核区和轴肩影响区为细小的等轴晶,填充区保留了原始塞棒组织,结合面区为母材与塞棒过渡区,热力影响区晶粒变形明显,热影响区晶粒有所长大.接头显微硬度高于母材,抗拉强度最高达260 MPa,为母材的83.9%,断后伸长率为6.5%,断口韧性特征明显.Friction plug repair welding by shoulder auxiliary heating based on filling friction stir welding(FSW) for 6082 aluminum alloy was used to repair keyhole volume defects by(FSW). Well-formed plug repair welding joints were obtained at different rotation speeds of plug. The results shown that microstructure in different areas of the joint changed obviously due to heat input and material deformation. The microstructure and distribution of the joint were similar under different rotation speed of plug rod. The welding joint can be divided into 6 parts: nugget zone, filling zone, bonding surface zone, shoulder affected zone, thermos-mechanically affected zone and heat affected zone. Nugget zone and shoulder affected zone have fine equiaxed grains, filling zone retained the original plug rod structure. The bonding surface zone is the transition zone between the base metal and the plug rod. The grain deformed obviously in thermos-mechanically affected zone, and the grain grown up in heat affected zone. The microhardness of the joint was higher than that of the base metal, the tensile strength was up to 260 MPa, which is 83.9% of the base metal, the elongation after fracture is 6.5%, and the fracture toughness is obvious.

关 键 词：6082铝合金 轴肩辅助加热 摩擦塞补焊 接头组织 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]