高强钛合金TIG焊接工艺研究

冯靖; 樊立民; 耿乃涛; 杨柳; 武少杰; 程方杰

doi:10.7513/j.issn.1004-7638.2021.06.023

高强钛合金TIG焊接工艺研究

doi: 10.7513/j.issn.1004-7638.2021.06.023

冯靖^1,,
樊立民¹,
耿乃涛²,
杨柳³,
武少杰¹,
程方杰^{1, 4, ,}

1.
天津大学材料科学与工程学院，天津 300350
2.
鞍钢集团北京研究院有限公司，北京 102200
3.
成都先进金属材料产业技术研究院股份有限公司，四川成都 610300
4.
天津市现代连接技术重点实验室，天津 300350

基金项目: 天津市科技计划项目（项目编号：18ZXJMTG00140）

详细信息

作者简介:
冯靖（1999—），男，陕西榆林人，硕士研究生，主要研究方向为先进连接技术研究，E-mail：18851197936@163.com

通讯作者:
程方杰（1971—），工学博士，教授/博士生导师，主要研究方向为先进焊接工艺和电弧增材制造，E-mail：chfj@tju.edu.cn

中图分类号: TF823, TG456
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出版历程
- 收稿日期: 2021-08-05
- 刊出日期: 2021-12-31

Research on TIG welding process of high strength titanium alloy

1.
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
2.
Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China
3.
Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610300, Sichuan, China
4.
Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China

摘要

摘要: 采用一种新型Ti-V-Mo系高强钛合金，通过TIG自动送丝和手动填丝两种方式进行了焊接工艺试验，对焊接接头的成形、组织和力学性能进行了分析测试。结果表明：两种焊接方式下的焊缝外观成形都很美观，没有飞溅和咬边等缺陷，焊道表面呈银白色；母材是一种等轴α相含量较高的双态组织，热影响区晶粒十分粗大，内部主要是针状α'相，焊缝区晶粒也十分粗大，主要由层片α相转变组织构成，含有少量针状α'相；自动送丝TIG和手动填丝TIG的接头抗拉强度分别为822 MPa和612 MPa，热影响区的冲击吸收功分别达到了72.2 J和84.9 J，表明该钛合金在TIG焊接工艺下，热影响区具有良好的韧性特征。
- 高强钛合金 /
- TIG焊 /
- 手工填丝 /
- 自动送丝 /
- 微观组织 /
- 热影响区
Abstract: A new type of high strength Ti-V-Mo titanium alloy was used as raw material. Welding test was carried out respectively by TIG automatic wire feeding and manual wire filling. The microstructure, forming, and mechanical properties of the joint were analyzed. The results show that the weld appearance shape is very smooth with no splash and edge defects. The base material has a duplex microstructure with higher content of equiaxed α phase. The grain size of the heat affected zone of Ti-V-Mo titanium alloy is very rough with needlelike α' phase inside the alloy. The grain size of weld area is very bulky, made up of a large number of layer α transitional phase structure and a small amount of needlelike α' phase structure. The tensile strength of the joint by TIG automatic and manual wire filling is 822 MPa and 612 MPa, respectively. And the impact absorbing energy of heat affected zone by TIG automatic and manual wire filling is 72.2 J and 84.9 J respectively. It shows good toughness characteristics in heat affected zone through the TIG welding process.
- high-strength titanium alloy /
- TIG welding /
- manual wire-filled /
- automatic wire-feeding /
- microstructure /
- heat-affected zone

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图 1 接头取样示意（单位：mm）

Figure 1. Schematic of joint sampling (Unit：mm)

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图 2 拉伸试样尺寸示意（单位：mm）

Figure 2. Schematic of the tensile sample size (Unit：mm)

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图 3 硬度测试试验示意

Figure 3. Schematic of hardness test

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图 4 两种TIG焊接方式下的焊缝表面成型

Figure 4. Weld surface forming of two TIG welding methods

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图 5 两种TIG焊接方式下的焊缝截面成型

Figure 5. Weld cross-section forming of two TIG welding methods

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图 6 母材金相组织

Figure 6. Metallographic structure of base metal

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图 7 两种TIG焊接方式下的热影响区组织与焊缝微观组织

Figure 7. The microstructure of the heat affected zone and the weld of two TIG welding methods

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图 8 两种TIG焊接方式下焊缝的显微硬度分布

Figure 8. The micro-hardness distribution of welds of two TIG welding methods

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图 9 拉伸试样断裂位置

Figure 9. Fracture position of tensile specimen

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图 10 试样断口形貌

Figure 10. Fracture morphologies of sample

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图 11 焊缝及热影响区冲击功结果

Figure 11. Impact energy results of welds and heat-affected zone

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图 12 焊缝及热影响区断口形貌

Figure 12. Fracture morphologies of weld and heat-affected zone

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表 1 两种TIG方式下焊接参数

Table 1. Welding parameters of two TIG methods

I/A U/V v_f/(m·min⁻¹) v_w/(m·min⁻¹)

自动TIG 122 9.6 0.36 0.26
手工TIG 80～110 9.6

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表 2 自动TIG和手工TIG焊拉伸性能

Table 2. Tensile properties of automatic TIG and manual TIG welding

编号抗拉强度/MPa 平均值/MPa

ZD-TIG-1 728 822
ZD-TIG-2 916
SG-TIG-1 599 612
SG-TIG-2 625

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