Microstructure and Mechanical Properties of Friction Plug Welding Joint of 6082 Aluminum Alloy
ZHANG Zhongke1,2, ZHAO Zaolong1, LI Defu1, ZHENG Jianghui1
1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: In this work, friction plug welding (FPW) process of 5 mm thick 6082-T8 aluminium alloy with 6082-T6 plug aluminium was performed at diffe-rent welding speeds. The metal fluidity, microstructure, second phase distribution, temperature field, mechanical properties, hardness and fracture morphology of FPW joint were analyzed and tested respectively. The results show: the upper half of FPW joint section has good metal flui-dity; the lowest friction heat at the root of the weld makes it the weak zone of FPW joint; in the friction interface zone (FIZ) of FPW joint, a large number of fine equiaxed grains in plug mental (PM) penetrate into the strip grains of base metal (BM) tightly, thus realizing the close bonding of FPW joint; the size, quantity and direction of β (Mg2Si) phase in different areas of welded joints have different changes; the FPW joint has the best welding mechanical properties at the welding speed of 2 200 r/min, the tensile strength and elongation of the joint reach more than 75% and 64% of BM, respectively; at the fracture position of the joint in the FIZ, the crack extends from the weak joint zone at the root of the weld to the surface of the weld, showing ductile fracture; hardness test results indicate that the lowest hardness occurred in base thermo-mechanically affec-ted zone and heat affected zone.
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2020, Vol. 34 
