Dynamic behavior of molten pool backside during full-penetration laser welding of Ni-based superalloys

Cheng, Hao; Li, Kang; Wang, Chao; Li, Qijun; Chang, Baohua; Du, Dong

doi:10.1007/s00170-021-08187-9

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…In addition, metal vapor (i.e., fumes) adhering to the substrate was observed. It has been reported that recoil pressure is generated by evaporation on the surface of the molten metal formed by laser irradiation, which affects the morphology of the melt pool [24,25]. It is considered that the effects of the recoil pressure on the morphology of the molten metal become signi cant at higher laser powers.…”

Section: Quality Assessment Of the Built Structurementioning

confidence: 99%

Single track formation of pure copper in directed energy deposition using a blue laser

Yamaguchi

Yamazaki²,

Funada³

et al. 2022

Preprint

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Additive manufacturing (AM) techniques, including directed energy deposition (DED), have been developed and applied in the copper parts manufacturing. DED processes with conventional infrared lasers require more energy owing to the low laser absorptivity of copper. Moreover, local thermal gradients cause large residual stresses, resulting in cracks, deformation, and failure of parts. This study focused on the DED process of pure copper using a blue laser with a wavelength of 445 nm and addressed the following deficiencies. Firstly, the influence of process parameters on the geometry and surface defects of the built structure, such as meandering, distortion, and cracking, were investigated. Secondly, the chemical composition of cross-sections of the built structure was analyzed using an electron probe microanalyzer (EPMA). Finally, a prediction of surface defect-free building conditions was presented. The results indicated that the laser power directly affected the built width and penetration depth, while the built height varied with the rate of powder supplied, and that the traverse speed was inversely proportional to the built height and width. The meandering and distortion of the built structure may be attributed to changes in the melting of the powder and process instability due to obstructions in the optical path of the laser. Meanwhile, the cracks generated owing to shrinkage during solidification when the molten area was formed by laser irradiation are insufficient. A structure without defects can be obtained at a powder feed rate of 20 mg/s, laser power between 60–270 W, and traverse speeds between 10–20 mm/s.

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Section: Quality Assessment Of the Built Structurementioning

confidence: 99%

Single track formation of pure copper in directed energy deposition using a blue laser

Yamaguchi

Yamazaki²,

Funada³

et al. 2022

Preprint

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show abstract

“…The high-energy density welding techniques, namely electron beam welding (EBW) and laser welding (LW), represent the best solutions for repairing the defects. In fact, they produce narrow joints with a high-penetration depth and low-thermal load reducing residual stresses in the MZ and HAZ [19][20][21][22][23][24]. However, even with EBW and LW, some problems related to the partitioning of alloying elements, γ ′ amount and formation of undesired phases in the MZ arise; thus, some post-welding heat treatments (PWHTs) are necessary [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Process Optimization in Laser Welding of IN792 DS Superalloy

Barbieri,

Cognini,

de Crescenzo

et al. 2024

Metals

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Ni-base superalloys are employed to produce parts of aeronautic engines, space vehicles and power plants. During the production process or lifetime of components, cracks may occur which affect their performance. Reliable repairs can be carried out through high-energy density welding techniques. This work investigated laser welding of the directionally solidified IN792 DS superalloy. The characteristics of the original material and their evolution in the base metal, heat-affected zone and melt zone after laser welding in different conditions and post-welding heat treatment were investigated through micro-hardness tests, light and scanning electron microscopy observations. The study allowed to optimize the process parameters and post-welding heat treatment, obtaining joints without macro-defects, such as cracks and pores, and with properties and microstructures of the melt zone like those of base metal.

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Influence of process parameters on the geometry and surface defects of the single-line track in the directed energy deposition of pure copper onto 304 stainless steel using a blue laser

Yamaguchi

Yamazaki

Funada

et al. 2022

Int J Adv Manuf Technol

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Dynamic behavior of molten pool backside during full-penetration laser welding of Ni-based superalloys

Cited by 7 publications

References 35 publications

Single track formation of pure copper in directed energy deposition using a blue laser

Single track formation of pure copper in directed energy deposition using a blue laser

Process Optimization in Laser Welding of IN792 DS Superalloy

Influence of process parameters on the geometry and surface defects of the single-line track in the directed energy deposition of pure copper onto 304 stainless steel using a blue laser

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