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Xuebo Liang,Xinjian Yuan,Haodong Wang,Xiuyang Li,Ci Li,Xueyu Pan 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.12
Resistance spot welding of 22MnB5/HSLA350 and its weldability are investigated. From base material to the nugget, the microstructure of 22MnB5 side can be expressed as M/tempered M+ granular carbides/F+M/fine M/lath M, and on HSLA350 side, F+M/F+flocculent P+tempered M/F+flocculent P+M/F+M/lath M are observed. The heat-affected zone (HAZ) of 22MnB5 exhibits obvious softening region and strengthening region caused by the tempered M and quite fine M, respectively. The peak load of welded joints undergoes two stages of a dramatic increase and a subsequent decrease with increases in the welding current. The maximum value (13.82 kN) of peak load is achieved at a welding current of 8 kA. The failure modes involving interfacial failure (IF), pullout failure from the galvanized steel (PFG), pullout failure from boron steel and tearing of the galvanized steel (PFB-TG) and pullout failure from the boron steel (PFB) are discussed in detail.
Xinjian Yuan,Xuebo Liang,Xiuyang Li,Miao Hong,Kunlun Tang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Brazing of a titanium alloy and an aluminum alloy was performed in a vacuum furnace with a pure tin foil interlayer. The microstructure and mechanical property of the brazed joint were investigated as functions of parameters including post bonding heat treatment. The results indicated that Al-Ti-Sn secondary phases were present in the joining region. These secondary phases coarsened clearly with increasing temperature from 450oC to 500oC. At 450oC, the unbonded zone appeared in the interface area between the Ti alloy and the joining zone. At 500oC, some cracks and coarsened secondary phases were observed in the joint. From 450oC to 500oC, the strength of the joint gave a hill-shaped curve change. The fracture was mainly brittle fracture. As the post bonding heat treatment was applied, the interdiffusion region with about 6 μm was found in the interface zone between the Ti alloy and the joining area, the secondary phases distributed with a small and dispersed pattern, and the tensile strength of the joint was improved to a higher value. Failure mode with lots of dimples was a ductile pattern.