A study on fatigue damage behavior of single-wire MIG welding joint for TC4 titanium alloy

Zhang Long; Li Qingbo; Dai Yu; Chen Donggao; He Yifan

doi:10.7513/j.issn.1004-7638.2022.02.010

Volume 43 Issue 2

May 2022

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Zhang Long, Li Qingbo, Dai Yu, Chen Donggao, He Yifan. A study on fatigue damage behavior of single-wire MIG welding joint for TC4 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 62-67. doi: 10.7513/j.issn.1004-7638.2022.02.010

Citation:

Zhang Long, Li Qingbo, Dai Yu, Chen Donggao, He Yifan. A study on fatigue damage behavior of single-wire MIG welding joint for TC4 titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 62-67. doi: 10.7513/j.issn.1004-7638.2022.02.010

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A study on fatigue damage behavior of single-wire MIG welding joint for TC4 titanium alloy

doi: 10.7513/j.issn.1004-7638.2022.02.010

Zhang Long^1
,,
Li Qingbo²,
Dai Yu¹,
Chen Donggao^{1
,
,},
He Yifan¹

1.
Ningbo Branch of China Ordnance Research Institute, Ningbo 315103, Zhejiang, China
2.
Harbin First Machinery Group Co., Ltd., Harbin 150056, Heilongjiang,China

Received Date: 2022-03-28
Available Online: 2022-05-11
Publish Date: 2022-04-28

Abstract

Abstract

A single-wire MIG welding process was carried out to weld TC4 titanium alloy with a thickness of 15 mm. The base metal and welded joint microstructure, tensile, and fatigue properties were analyzed and tested. The results showed that the welded joints were divided into the base metal, heat-affected zone, and weld zone. The base metal had an α+β equiaxed structure, and the heat-affected zone was a mixture of α+β and α′-martensite. The grains in the weld zone presented a coarse state under the intense thermal shock; meanwhile, the α′-martensite structure formed the interior of the grain. The tensile specimen fractured at the base metal, and the elongation after fracture was 10.5%. The fatigue life of base metal and welded joints decreased with increased stress levels. The fatigue life of base metal was higher than that of base metal at high-stress levels but opposite at low-stress levels. The fatigue source of the base metal was located at the surface scratches of the sample, and the joint fatigue originated from the internal pores. Many secondary cracks formed in the fatigue propagation zone of the joint, the spacing of the fatigue bands in the fatigue propagation zone was more minor than that of the base metal, and there were many dimples in the transient fracture zone of the joint and the base metal.
- TC4 titanium alloy,
- single-wire MIG welding,
- microstructure,
- α′-martensite,
- fatigue performance

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References(12)

References

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