焊接电流对双相不锈钢机器人TIG焊焊接接头组织和性能的影响  

EFFECT OF WELDING CURRENT ON MICROSTRUCTURE AND PROPERTIES OF TIG WELDING JOINT OF DUPLEX STAINLESS STEEL ROBOT

作　　者：刘蒙恩 汪涵迪 LIU Meng-en;WANG Han-di(School of Mechanical and Automotive Engineering,Nanyang Institute of Technology,Nanyang 473004,China)

机构地区：[1]南阳理工学院机械与汽车工程学院,河南南阳473004

出　　处：《南阳理工学院学报》2020年第4期76-79,共4页Journal of Nanyang Institute of Technology

基　　金：河南省科技厅2018年度科技攻关项目(182102210463)。

摘　　要：采用机器人TIG焊对双相不锈钢进行了连接,研究了不同焊接电流对焊接接头组织和性能的影响。利用电子显微镜、拉伸试验机和微观硬度计等设备对接头性能进行了测试分析。结果表明:随着焊接电流逐渐增加,接头中奥氏体相所占比例先增加后减小;焊接接头的综合力学性能(抗拉强度、伸长率、硬度)出现了先增加,后减小的趋势;当焊接电流为55 A时得到的焊接接头性能最佳,抗拉强度最高达674 MPa,伸长率为26.5%,焊缝中心硬度最大值为191.4 HV,热影响区硬度最大值为217.6 HV。The effect of different welding currents on the microstructure and properties of the welded joint was studied.The joint performance was tested and analyzed by means of electron microscope,tensile testing machine and micro hardness tester.The results show that with the increase of welding current,the proportion of austenite phase in the joint increases first and then decreases.The comprehensive mechanical properties(tensile strength,elongation and hardness)of welded joints increased first and then decreased.When the welding current is 55 A,the welding joint has the best performance,the highest tensile strength is 674 MPa,the elongation is 26.5%,the maximum hardness of the weld center is 191.4 HV,and the maximum hardness of the heat affected zone is 217.6 HV.

关 键 词：双相不锈钢 焊接电流 奥氏体 硬度 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]