Microstructure and mechanical/conductivity properties of pure copper joint welded by friction stir welding  

作　　者：Ju Chuan Gong Wenbiao Liu Wei Jiang Fan Wang Wenquan 鞠川;宫文彪;刘威;姜帆;王文权(Laboratory of Advanced Structural Materials,Changchun University of Technology,Changchun 130012,China;Department of Materials Science and Engineering,Jilin University,Changchun 130025,China)

机构地区：[1]Laboratory of Advanced Structural Materials,Changchun University of Technology,Changchun 130012,China [2]Department of Materials Science and Engineering,Jilin University,Changchun 130025,China

出　　处：《China Welding》2020年第3期26-32,共7页中国焊接（英文版）

基　　金：the Changchun Science and Technology Innovation“Double Ten Project”(17SS024).

摘　　要：Copper plates with 3 mm thickness were friction stir welded at a rotation rate of 800 r/min and different welding velocity.The effects of microstructure and the mechanical/conductivity properties of the FSW joints were studied.The results indicate that the grain sizes of nugget zones are 2.49,2.13 and 5.07μm for welding speed of 100,150 and 200 mm/min,respectively.Furthermore,lower density of dislocation was obtained in the nugget zone.Under the welding speed of 200 mm/min,annealing twins had been observed.When the speed is 150 mm/min,the tensile strength of the stir welded joint is 264 MPa that can reach 98%of the base metal.The mechanical properties of the joints with the welding speed of both 100 mm/min and 200 mm/min are lower than the base metal.The corrosion resistance of weld is higher than that of base metal.Electrical resistivity measurement shows no obvious change in the welded joints compared to the base metal at the room temperature.

关 键 词：friction stir welding MICROSTRUCTURE mechanical properties corrosion resistance electrical resistivity 

分 类 号：TG453.9[金属学及工艺—焊接]