大厚度TC4合金熔池导流电子束焊接成形  

Electron Beam Welding and Forming on Large-Thickness TC4 Alloy With Induced Molten Pool Flow

作　　者：付鹏飞 唐振云 李立航 耿康 毛智勇 赵桐 FU Pengfei;TANG Zhenyun;LI Lihang;GENG Kang;MAO Zhiyong;ZHAO Tong(Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]中国航空制造技术研究院高能束流研究所,北京100024

出　　处：《航空制造技术》2025年第1期14-20,共7页Aeronautical Manufacturing Technology

基　　金：国防基础科研计划(JCKY2022205A001)。

摘　　要：为满足飞机大型结构件研制需求,针对170 mm厚TC4钛合金开展电子束焊接技术研究,采用熔池导流电子束焊接方法。通过变聚焦焊接试验方法,获得了2415~2400 mA聚焦电流状态的焊接工艺,最大焊接熔深达162mm,焊缝呈近似平行形貌,实现了大厚度钛合金熔池金属流动、焊缝成形的调控。试验结果表明,焊缝区存在粗大的柱状晶和针状α'马氏体组织,随着焊接熔深的增加,焊缝晶粒和显微组织逐渐细化均匀;接头显微硬度呈马鞍形分布,沿熔深由上至下从337HV逐渐增加至356HV。研究结果验证了熔池导流电子束焊接技术可改善大厚度钛合金的熔透成形、焊缝形貌及组织均匀性。To content large part manufacturing of the airplane,electron beam welding(EBW)was employed on TC4 titanium alloy with 170 mm thickness,which was investigated by the method of induced molten poolflow.The experiments with variable focusing welding were conducted on the plates,which achieved the underfocusing processing under the current of 2415–2400 mA.The maximum of welding depth reaches 162 mm,and weld morphology is parallel,which contributing to thefluidity of molten pool and welding formation.The microstructures in weld area are coarse crystals and acicular martensiteα',which became gradually refining and homogeneity with the welding penetration increasing.The microhardness of the joint presents the saddle-shaped distribution along the cross section,which gradually increases from 337HV to 356HV along welding depth direction.The investigation verified effectiveness of the EBW processing with induced molten poolflow,which can improve the penetration forming,weld morphology,and microstructure uniformity of large-thickness titanium alloys.

关 键 词：钛合金 电子束焊接 熔池导流 焊缝形貌 组织性能 

分 类 号：TG456.3[金属学及工艺—焊接] V261.34[航空宇航科学与技术—航空宇航制造工程]