TA2钨极氩弧焊焊接工艺的优化

为了研究TA2钨极氩弧焊的最佳工艺参数,采用自动TIG焊对厚度为5 mm的TA2试板进行了焊接实验.焊后对焊接接头进行了拉伸实验和硬度实验,并对焊接接头的显微组织和拉伸断口进行了观察.结果表明,在焊接电流为170 A、焊接速度为2.0 mm/s的最优参数条件下,焊接接头的抗拉强度为598.3 MPa,断后伸长率为26.7%,断面收缩率为38.5%,焊缝硬度为209 HB,热影响区硬度为182 HB.适宜的焊接工艺参数能够减少焊接接头中马氏体和魏氏组织的产生,并提高焊接接头的强度和塑性.

Optimization of tungsten argon arc welding technology for TA2

In order determine the optimum technological parameters of tungsten argon arc welding for TA2, the welding test for the TA2 test plate with a thichness of 5mm was performed with automatic TIG welding. The tensile test and hardness test as well as the observations on the microstructure and tensile fracture surface were performed for the welded joints. The results show that under the optimum condition with the welding current of 170 A and the welding speed of 2.0 mm/s, the ultimate tensile strength of welded joint is 598.3 MPa, the elongation to failure is 26.7%, the reduction rate in area is 38.5%, the hardness of welded seam is 209 HB, and the hardness of heat affected zone is 182 HB. The appropriate welding parameters can reduce the formation of martensite and widmanstatten structures in the welded joints, and improve the strength and plasticity of welded joints.