Influence mechanism and improvement strategy of aspect ratio on the poor fusion between laser cladding channels

YANG Gaolin; ZHENG Quanhang; QIAN Haokai; FAN Wen; ZHANG Qunli; SHI Yuelin; YAO Jianhua

doi:10.12073/j.hjxb.20230307002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(10): 49-56. > DOI: 10.12073/j.hjxb.20230307002

YANG Gaolin, ZHENG Quanhang, QIAN Haokai, FAN Wen, ZHANG Qunli, SHI Yuelin, YAO Jianhua. Influence mechanism and improvement strategy of aspect ratio on the poor fusion between laser cladding channels[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(10): 49-56. DOI: 10.12073/j.hjxb.20230307002

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Influence mechanism and improvement strategy of aspect ratio on the poor fusion between laser cladding channels

YANG Gaolin^{1, 2,},
ZHENG Quanhang^{1, 2},
QIAN Haokai^{1, 2},
FAN Wen^{1, 2},
ZHANG Qunli^{1, 2},
SHI Yuelin³,
YAO Jianhua^{1, 2, ,}

1.
Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, 310023, China
2.
Collaborative Innovation Center of High-End Laser Manufacturing Equipment, Hangzhou, 310023, China
3.
Zhoushan Dingzun Intelligent Technology Co., Ltd., Zhoushan, 316031, China

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Received Date: March 06, 2023
Available Online: October 09, 2023

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Abstract

Abstract

Poor fusion is a common process defect in laser cladding. In order to explore the mechanism of poor fusion during inter-track overlap, single-track single-layer cladding test, multi-track single-layer cladding test, multi-track remelting test and single-layer tail-track remelting test were designed, and the simulation of temperature field during single-track cladding was carried out. The results show that the formation mechanism of the poor fusion defect is that the upper part on edge of the deposited area is raised, and the heat dissipation is slower and the melting is faster when the laser irradiates its surface. The laser energy input at the edge root is low and the shape is concave. so the heat dissipation is fast and the melting is slow. The molten liquid is turned out by the upper convex part and connected with the molten part of the root and the substrate, resulting in the gap between the root of the cladding layer and the laser, resulting in poor fusion defects. In order to reduce the occurrence of such poor fusion defects, a single-layer multi-pass lap test of the inclined cladding head was designed according to the mechanism of poor fusion. The results show that the inclined cladding head can effectively reduce the occurrence of poor fusion defects.
- poor fusion,
- width-height ratio,
- laser cladding,
- additive manufacturing

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References (27)

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Influence mechanism and improvement strategy of aspect ratio on the poor fusion between laser cladding channels