磁场电流对TA2钛合金焊接接头组织和性能的影响

Effect of Magnetic Field Current on Microstructure and Mechanical Properties of Welded Joint of TA2 Alloy

将纵向磁场引入到钛合金的非熔化极钨极氩弧焊(TIG)中,焊接过程中调节磁场电流的大小,通过对不同磁场电流下焊接接头进行相应的拉伸试验、硬度试验和显微组织分析,探究磁场电流对焊接接头的力学性能和显微组织的作用规律。结果表明:外加磁场可以提升焊接接头的综合性能,当磁场电流为6 A、频率为20 Hz时,焊接接头的力学性能达到了最佳值,此时抗拉强度为452.6 MPa,伸长率为29.84%,硬度为351 HV,焊缝显微组织的细化最明显。

The titanium alloy was welded by argon tungsten arc welding（TIG） under longitudinal magnetic field. The magnetic field current was adjusted during the welding process. The tensile test, hardness test and microstructure of the welded joint were detected to explore the rules of magnetic field current for mechanical properties and microstructure of the welded joint, under different magnetic field current. The results show that： the external magetic field can improve the comprehensive properties of welded joints, when the electric current is 6A, frequency is 20 Hz, the mechanical properties of the welding joints achieve the best value, then the tensile strength is 452.6MPa, elongation is 29.84%, hardness is HV351,then,the most significant refinement of the microstructure can obtained.