Transactions of Nanjing University of Aeronautics & Astronautics
Microstructure and Mechanical Properties of Ti-4Al-1.5Mn Resistance Spot Welding Joints
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Abstract:
Ti-4Al-1.5Mn dual phase titanium alloy sheet was spot welded by pneumatic resistance spot welder. The effects of different welding parameters on shear load and nugget diameter were studied. The results show that the maximum shear load of solder joint increases first and then decreases with the increase of electrode pressure and welding current， while the nugget diameter increases with the increase of electrode pressure and welding current. Electrode pressure of 0.20 MPa and welding current of 46 A are the optimal process parameters， under which the maximum shear load of solder joint reaches 8.80 kN. The microstructure of nugget zone is coarse acicular martensite， and the solder joints fail in a mixed mode of intergranular brittle-ductile fracture.
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This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institution and Beijing Institute of Aeronautical Materials （No.KZ82171509）.
Clc Number:
TG146;TG668
CHINA AERO-SCIENCES
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