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The International Journal of Advanced Manufacturing Technology
Published in: The International Journal of Advanced Manufacturing Technology 1-2/2022

02-11-2021 | ORIGINAL ARTICLE

Effect of welding heat input on pores in laser-arc hybrid welding of high nitrogen steel

Authors: Bo Cui, Shuangyu Liu, Fulong Zhang, Tianwen Luo, Mingjia Feng

Published in: The International Journal of Advanced Manufacturing Technology | Issue 1-2/2022

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Abstract

This study explores the laser-arc hybrid welding process of high nitrogen steel (HNS) in order to circumvent the problem of welding porosity. The influence of welding heat input on welding porosity has been elucidated by analyzing the changes in the morphological characteristics of the laser keyhole and the molten pool temperature. The results show that the pore ratio increases with a rise in laser power. Meanwhile, the pore ratio first decreases and then increases as the welding current intensifies. Additionally, it decreases as the welding speed and defocus amount increase. The lowest pore ratio of the weld is considered as the desired value, and the response surface method (RSM) is used to optimize the heat input parameters. When the laser power ranges from 2.80 to 2.85 kW, the welding current becomes 260 A, welding speed ranges from 0.73 to 0.80 m/min, defocus amount ranges from 0 to 1 mm, and pore ratio of the weld exhibits its minimum value (4.29 to 4.67%).
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Metadata
Title
Effect of welding heat input on pores in laser-arc hybrid welding of high nitrogen steel
Authors
Bo Cui
Shuangyu Liu
Fulong Zhang
Tianwen Luo
Mingjia Feng
Publication date
02-11-2021
Publisher
Springer London
Published in
The International Journal of Advanced Manufacturing Technology / Issue 1-2/2022
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI
https://doi.org/10.1007/s00170-021-08113-z

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