Study on the microstructures and properties of high speed laser welded joints of CP800 high strength steel

Jiang Tong; Wang Dafeng; Zou Shengguang; Zeng Haolin; Ma Bing; Chen Donggao

doi:10.7513/j.issn.1004-7638.2024.03.025

Volume 45 Issue 3

Jul. 2024

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Jiang Tong, Wang Dafeng, Zou Shengguang, Zeng Haolin, Ma Bing, Chen Donggao. Study on the microstructures and properties of high speed laser welded joints of CP800 high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 182-187. doi: 10.7513/j.issn.1004-7638.2024.03.025

Citation:

Jiang Tong, Wang Dafeng, Zou Shengguang, Zeng Haolin, Ma Bing, Chen Donggao. Study on the microstructures and properties of high speed laser welded joints of CP800 high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 182-187. doi: 10.7513/j.issn.1004-7638.2024.03.025

Citation:

Jiang Tong, Wang Dafeng, Zou Shengguang, Zeng Haolin, Ma Bing, Chen Donggao. Study on the microstructures and properties of high speed laser welded joints of CP800 high strength steel[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(3): 182-187. doi: 10.7513/j.issn.1004-7638.2024.03.025

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Study on the microstructures and properties of high speed laser welded joints of CP800 high strength steel

doi: 10.7513/j.issn.1004-7638.2024.03.025

Ningbo Branch of China Ordnance Research Institute, Ningbo 315103, Zhejiang, China

More Information

Received Date: 2023-11-28
Publish Date: 2024-07-02

Abstract

Abstract

In order to further improve the laser welding speed and solve the problem of weld depression in the process of high speed welding, carried out high speed laser welding of CP800 high strength steel was carried out at 12 m/min, and the influence of laser incidence angle on weld forming was studied. Under the optimal welding process parameters, the weld forming, weld quality, weld joint structure, hardness and mechanical properties were studied. The results show that when the laser incidence angle is +10°, there is basically no spatter on the surface of the weld, and the depression is minimal. In addition, under the optimal welding parameters of 12500 W laser power, 12 m/min welding speed and laser incidence angle of +10°, the surface and internal quality of the weld are better, the weld melt width is about 1.15 mm, and the width of the heat-affected zone is about 0.35 mm. Weld structure mainly consists of lathed martensitic, acicular ferrite and slight granular bainite. The measured hardness (HV) in weld ranges 402.5~408.5. The tensile strength and impact energy at room temperature of weld joint can achieve 96% and 87.5% of those of base metal respectively.
- CP800 high strength steel,
- high speed laser welding,
- laser incidence angle,
- microstructure,
- mechanical property

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References(11)

References

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