李雨,徐望辉,谢伟峰,余陈,赵荣泽

• 1:东北电力大学机械工程学院
• 2:广东省科学院中乌焊接研究所

摘要(Abstract)：

针对304不锈钢窄间隙TIG(非熔化极惰性气体保护电弧焊)焊接焊缝晶粒粗大、接头拉伸性能较差等问题，采用将超声振动头施加在试板，在TIG焊接过程引入超声振动的方法对其进行焊接，研究了焊接接头的组织和力学性能。结果表明：引入超声振动后，在热力学和动力学综合作用下，焊缝熔深增加，焊缝区柱状晶向等轴晶转变速率提高，等轴晶占比增多，晶粒细化；与常规TIG相比，引入超声振动后改善了304不锈钢窄间隙焊接接头的焊缝组织，提高了其力学性能，焊缝区的硬度明显提高，接近于母材，焊接接头的抗拉强度和屈服强度也均高于常规TIG焊接接头，伸长率也得到提高；当超声振幅为40μm时，焊接接头的抗拉强度最高，为674 MPa,屈服强度也较高，为376 MPa,断后伸长率为25%。

关键词(KeyWords)： 304不锈钢;超声振动;TIG焊接;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52005112);; 广州市科技计划项目(201604046026);; 广东省科技计划项目(2021B0101250001);; 广东省海洋经济发展专项资金项目(粤自然资合[2021]46号)

作者(Author): 李雨,徐望辉,谢伟峰,余陈,赵荣泽

DOI: 10.13289/j.issn.1009-6264.2023-0060

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