TC4钛合金磁控窄间隙TIG焊试板热处理前后三维应力

doi:10.3901/JME.2019.06.061

机械工程学报 ›› 2019, Vol. 55 ›› Issue (6): 61-66.doi: 10.3901/JME.2019.06.061

• 特邀专栏：焊接力学与结构设计 • 上一篇下一篇

TC4钛合金磁控窄间隙TIG焊试板热处理前后三维应力

余陈¹, 陈静², 陈怀宁², 张宇鹏¹, 房卫萍¹

1. 广东省焊接技术研究所(广东省中乌研究院)广东省现代焊接技术重点实验室广州 510650;
2. 中国科学院金属研究所沈阳 110016

收稿日期:2018-02-23 修回日期:2019-02-02 出版日期:2019-03-20 发布日期:2019-03-20
通讯作者: 陈怀宁(通信作者),男,1962年出生,博士,研究员。主要研究方向为焊接接头质量控制。E-mail:hnchen@imr.ac.cn
作者简介:余陈,男,1991年出生,硕士,工程师。主要研究方向为高能束流加工、高效弧焊技术、焊接有限元模拟等。E-mail:yuch@gwi.gd.cn
基金资助:
广东省科技（2017A070701026，2016B070701025）、广州市科技（201704030112，201807010035）和攀钢科技合作（2014-03、2015-10）资助项目。

Triaxial Stresses in TC4 Ti-alloy Weldments by Magnetically Controlled Narrow Gap TIG Welding before and after PWHT

YU Chen¹, CHEN Jing², CHEN Huaining², ZHANG Yupeng¹, FANG Weiping¹

1. Guangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute(China-Ukraine E. O. Paton Institute of Welding), Guangzhou 510650;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received:2018-02-23 Revised:2019-02-02 Online:2019-03-20 Published:2019-03-20

摘要/Abstract

摘要： 针对100 mm和31 mm厚TC4钛合金磁控窄间隙非熔化极惰性气体保护（Tungsten inert gas，TIG）焊试板，采用压痕应变法测量表面残余应力分布，采用全释放应变法测量厚度方向的三维残余应力分布。结果表明，两种厚度试板的焊接残余应力数值有所不同：100 mm厚试板表面纵向和横向残余应力峰值高达600～700 MPa，接近材料屈服强度的70%～80%；31 mm厚试板表面纵向和横向残余应力峰值较低，仅达到材料屈服强度的40%～50%。两种厚度残余应力差异较大的原因主要由较大厚度下横向收缩的累积效应造成。经过650℃的真空焊后热处理，两种厚度的焊接试板纵向和横向应力均显著降低，应力降低幅度最高超过50%，剩余残余应力峰值均不超过200 MPa，焊缝处沿厚度方向分布的各向残余应力均接近零值，表面残余应力出现了重新分布。

关键词: 薄壁管, 弹复, 工艺原理, 三辊矫圆, 数学归纳法, 往复弯曲, TC4钛合金, 残余应力, 磁控窄间隙TIG, 焊后热处理

Abstract: For 100 mm and 31 mm thick TC4 Ti-alloy magnetically controlled narrow gap TIG weldments, residual stresses distribution of the surface is measured by indentation strain-gage method and triaxial stresses distribution in the thickness direction is measured by sectioning relaxation strain-gage method. Results show that welding residual stresses values of the two weldments are different. Longitudinal and transverse stresses peak values of the 100 mm thick weldment reached as high as 600-700 MPa, close to 70%-80% of the material yield strength. Longitudinal and transverse stresses peak values of the 31 mm thick weldment are low, only 40%-50% of the material yield strength. The reason for large difference of residual stresses between the two thicknesses weldments was mainly due to the cumulative effect of lateral shrinkage in large thickness weldment. After 650℃ vacuum heat treatment, longitudinal and transverse stresses of the two thickness weldments are significantly reduced, maximum stress reduction is more than 50%, remaining residual stresses peak values do not exceed 200 MPa, and stresses along the thickness direction of the weld is close to zero, stresses at surface are also redistributed.

Key words: mathematical induction method, process mechanism, reciprocating bending, springback, thin-walled pipe, three-roller setting round, magnetically controlled narrow TIG welding, PWHT, residual stress, TC4 Ti-alloy

中图分类号:

TG407

余陈, 陈静, 陈怀宁, 张宇鹏, 房卫萍. TC4钛合金磁控窄间隙TIG焊试板热处理前后三维应力[J]. 机械工程学报, 2019, 55(6): 61-66.

YU Chen, CHEN Jing, CHEN Huaining, ZHANG Yupeng, FANG Weiping. Triaxial Stresses in TC4 Ti-alloy Weldments by Magnetically Controlled Narrow Gap TIG Welding before and after PWHT[J]. Journal of Mechanical Engineering, 2019, 55(6): 61-66.

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TC4钛合金磁控窄间隙TIG焊试板热处理前后三维应力

Triaxial Stresses in TC4 Ti-alloy Weldments by Magnetically Controlled Narrow Gap TIG Welding before and after PWHT

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