电焊机2025，Vol.55Issue(6)：125-131,139,8.DOI:10.7512/j.issn.1001-2303.2025.06.17
小径TA16钛合金管对接焊缝的缺陷修复工艺研究
Defect Repair Process for Butt Welds of Small Diameter TA16 Ti Alloy Pipes
陈坤 1徐少峰 1潘晓冬 1王建1
作者信息
- 1. 中国核动力研究设计院,四川 成都 610213
- 折叠
摘要
Abstract
To address the challenges in repairing porosity defects in butt welds of small-diameter TA16 titanium alloy tubes,a defect rework process synergistically optimized through mechanical machining and finite element simulation is proposed.Radiographic testing and metallographic dissection revealed that porosity defects primarily concentrate in the central weld zone(at depths of 1/2 to 2/3 of the weld thickness).Based on this finding,a rework groove with specific dimensions was de-signed via mechanical machining.A three-dimensional thermo-mechanical coupling model was established using Abaqus soft-ware,incorporating dual-ellipsoid heat source calibration and dynamic temperature field simulation.This approach eluci-dated the molten pool evolution and internal wall thermal cycling characteristics during rework welding,identifying gradient-controlled parameters(peak current:35 A,base current:30 A)to achieve precise root penetration and controllable internal convexity.Repair welding trials on 15 defective welds using optimized parameters demonstrated complete elimina-tion of porosity defects.Microstructural analysis revealed no significant broadening of the heat-affected zone,while fully re-melted weld centers exhibited lamellar α-phase structures with high aspect ratios.The repaired welds exhibited room-temperature and 350℃high-temperature tensile strengths of 567 MPa and 368 MPa,respectively,both exceeding base mate-rial specifications,with fractures occurring in the parent material zone,confirming no mechanical degradation induced by the repair process.This study establishes a process optimization framework for defect repair in thin-walled titanium alloy tubes,offering significant engineering value for enhancing the reliability of titanium components in aerospace and related fields.关键词
TA16钛合金管/对接焊缝/气孔缺陷/缺陷修复/有限元模拟Key words
TA16 titanium alloy pipe/butt weld/porosity defect/defection repair/finite element simulation分类
金属材料引用本文复制引用
陈坤,徐少峰,潘晓冬,王建..小径TA16钛合金管对接焊缝的缺陷修复工艺研究[J].电焊机,2025,55(6):125-131,139,8.
