摘要
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.
采用气动电阻点焊机对Ti-4Al-1.5Mn双相钛合金薄板进行了点焊。研究了不同焊接工艺参数对剪切载荷和熔核直径的影响。结果表明,焊点的最大剪切载荷随电极压力和焊接电流的增大先增大后减小,而熔核直径随电极压力和焊接电流的增大而增大。最佳工艺参数为电极压力0.20 MPa,焊接电流46 A,焊点最大剪切载荷为8.80 k N。熔核区组织为粗针状马氏体,焊点以晶间脆-韧性断裂的混合方式失效。
基金
supported by the Priority Academic Program Development of Jiangsu Higher Education Institution and Beijing Institute of Aeronautical Materials(No.KZ82171509)。
