钛合金激光窄间隙填丝焊接接头组织与性能研究  

Research on Microstructure and Properties of Titanium Alloy Laser Narrow Gap Wire Filling Welding Joints

作　　者：马照伟 符成学 廖志谦[1,2] 余巍 闫晨昊[1] 张文豪 杜志博 王伟超 MA Zhaowei;FU Chengxue;LIAO Zhiqian;YU Wei;YAN Chenhao;ZHANG Wenhao;DU Zhibo;WANG Weichao(Luoyang Ship Material Research Institute,Luoyang 471023,Henan,China;National Key Laboratory of Marine Corrosion and Protection,Luoyang 471023,Henan,China)

机构地区：[1]洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所),河南洛阳471023 [2]海洋腐蚀与防护全国重点实验室,河南洛阳471023

出　　处：《焊管》2025年第3期18-22,共5页Welded Pipe and Tube

摘　　要：为满足钛合金厚板激光窄间隙填丝焊焊接接头的性能要求,采用摆动激光窄间隙填丝焊接技术开展了80 mm厚TC4钛合金的焊接试验,分析了焊接接头微观组织及力学性能。结果显示,当激光功率为6 kW、离焦量为+10 mm、焊接速度为0.6 m/min、送丝速度3 m/min时,焊缝成形良好;母材和焊丝的熔合良好,未发现层间及侧壁未熔合缺陷;焊缝区组织主要为粗大β柱状晶、片层状α'和晶间β相;热影响区组织呈现明显的过渡形貌。焊缝区的硬度高于热影响区和母材区,热影响区硬度逐渐降低;焊缝区根部至表面的硬度变化不大,焊缝硬度均匀性良好。拉伸测试结果显示,接头的平均抗拉强度为956 MPa,力学性能优良。In order to meet the performance requirements of laser narrow gap wire filler welding joint for titanium alloy thick plate,the welding test of 80 mm thick TC4 titanium alloy was carried out using the swing laser narrow gap wire filling welding technology.The microstructure and mechanical properties of the welded joint were analyzed.The results show that when the laser power is 6 kW,the defocus is+10 mm,the welding speed is 0.6 m/min,and the wire feeding speed is 3 m/min,the weld is well formed.The metallographic test results show that the welding wire has good fusion and no interlayer or sidewall fusion defects have been found.The microstructure of the weld zone consists of coarseβcolumnar crystals with obvious grain boundaries,and the intragranular structure consists of acicular martensiteα'+intergranularβphase.The structure of the heat affected zone exhibits a clear transitional morphology.The hardness of the weld zone is higher than that of the heat affected zone and the base metal zone,and a low hardness zone appears in the heat affected zone.The hardness from the root of the weld zone to the surface of the weld varies from decrease to increase to decrease.The tensile test results show that the average tensile strength of the joint is 956 MPa,with excellent mechanical properties.

关 键 词：钛合金厚板 窄间隙激光焊 焊接接头 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]