厚壁钛合金激光填丝焊接接头组织性能及应力分析  

Microstructure,Properties and Stress Analysis of Thick-Walled Titanium Alloy Laser Welded Joint with Filler Welding Wire

作　　者：武鹏博 冯志强 方乃文[1] 路全彬 黄瑞生[1] 廖志谦 孙徕博 秦建 黎泉 常云峰 牛董山钰 Wu Pengbo;Feng Zhiqiang;Fang Naiwen;Lu Quanbin;Huang Ruisheng;Liao Zhiqian;Sun Laibo;Qin Jian;Li Quan;Chang Yunfeng;Niudong Shanyu(Harbin Welding Institute Limited Company,Harbin 150028,China;Beibu Gulf University,Qinzhou 535011,China;China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450000,China;Luoyang Ship Material Research Institute,Luoyang 471023,China;Harbin Institute of Technology Suzhou Research Institute,Suzhou 215104,China)

机构地区：[1]中国机械总院集团哈尔滨焊接研究所有限公司,黑龙江哈尔滨150028 [2]北部湾大学,广西钦州535011 [3]中国机械总院集团郑州机械研究所有限公司,河南郑州450000 [4]中国船舶集团有限公司第七二五研究所,河南洛阳471023 [5]哈尔滨工业大学苏州研究院,江苏苏州215104

出　　处：《稀有金属材料与工程》2025年第2期401-412,共12页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2021YFB3401100);国家自然科学基金(52261044);泰山产业领军人才工程专项(2024001)。

摘　　要：采用Ti-Al-V-Mo系药芯焊丝作为填充金属,实现了96 mm厚TC4钛合金板的超窄间隙激光填丝焊接,并系统研究了焊接接头层间区域的组织演化规律,同时采用数值模拟技术分析激光填丝焊接过程应力分布特征。结果表明,焊接接头上、中、下3部分的抗拉强度平均数值为935 MPa、屈服强度平均为794 MPa、断后伸长率为20%;上、中、下焊接接头3部分的室温冲击韧性测试结果平均数值为31 J,沿壁厚方向焊接接头的组织性能分布较为均匀;随着焊接道数增加焊缝中心由压应力转变为拉应力,横向和纵向残余应力的高应力距离表面约6 mm,最大拉应力值为1030 MPa。To realize high quality and high efficiency welding of large thickness titanium alloy,a flux-cored welding wire was developed by optimizing the synergistic mechanism of metal powder cores.The microstructure evolution of the interlayer region of the welded joint was studied,the stress distribution in the process of laser welding was analyzed by numerical simulation,and the ultra-narrow gap laser welding of TC4 titanium alloy plate with 96 mm in thickness was realized.The results show that the average tensile strength of the upper,middle and lower parts of the welded joint is 935 MPa,the average yield strength is 794 MPa,and the elongation is 20%.The average value of the impact toughness of the upper,middle and lower welded joints at room temperature is 31 J,and the microstructure and properties of the welded joints are well distributed along the wall thickness direction.With the pass of welding increasing,the change from compressive stress to tensile stress occurs in the welded seam center;the high stress zone of transversal and longitudinal residual stress is not in the surface of the sample,but in the welded seam with 6 mm to the surface,and the maximum tensile stress is 1030 MPa.

关 键 词：厚壁钛合金 窄间隙激光填丝焊 组织性能 应力分析 

分 类 号：TG457.1[金属学及工艺—焊接]