Study of an annular laser beam based axially-fed powder cladding process

Govekar, Edvard; Jeromen, Andrej; Kuznetsov, Alexander; Levy, Gideon; Fujishima, Makoto

doi:10.1016/j.cirp.2018.04.082

Cited by 32 publications

(15 citation statements)

References 8 publications

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“…The catchment efficiency of powders generally depends on the feed rate of powders, the flow rate of carrier gas, the diameter distribution of powders, the beam profile of the laser, the scan speed of the laser, etc. [42,72,94]. Despite the maximum catchment efficiency of powders was reported to be nearly 90% for a specific case, the material usage efficiency of LAM-DED process is generally less than 30% [42,57,74].…”

Section: Effects Of Deposition Parametersmentioning

confidence: 99%

“…5 [42,[57][58][59][60][94][95][96][97]. The power of the laser, the scan speed of the laser and the feed rate (mass flow rate) of powders are major parameters affecting the bead formation, joining between successive layers, the porosity, the microstructure, and the residual stress [42,60,98].…”

Section: Effects Of Deposition Parametersmentioning

confidence: 99%

“…( 1) and ( 2) [42,60,98]. The beam diameter and the profile of the laser beam affect the minimum size of the feature and the formation of the molten pool [60,94]. The catchment efficiency of powders generally depends on the feed rate of powders, the flow rate of carrier gas, the diameter distribution of powders, the beam profile of the laser, the scan speed of the laser, etc.…”

Section: Effects Of Deposition Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Directed Energy Deposition (DED) Process: State of the Art

Ahn

2021

Int. J. of Precis. Eng. and Manuf.-Green Tech.

321

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Metal additive manufacturing technologies, such as powder bed fusion process, directed energy deposition (DED) process, sheet lamination process, etc., are one of promising flexible manufacturing technologies due to direct fabrication characteristics of a metallic freeform with a three-dimensional shape from computer aided design data. DED processes can create an arbitrary shape on even and uneven substrates through line-by-line deposition of a metallic material. Theses DED processes can easily fabricate a heterogeneous material with desired properties and characteristics via successive and simultaneous depositions of different materials. In addition, a hybrid process combining DED with different manufacturing processes can be conveniently developed. Hence, researches on the DED processes have been steadily increased in recent years. This paper reviewed recent research trends of DED processes and their applications. Principles, key technologies and the state-of-the art related to the development of process and system, the optimization of deposition conditions and the application of DED process were discussed. Finally, future research issues and opportunities of the DED process were identified.

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Section: Effects Of Deposition Parametersmentioning

confidence: 99%

Section: Effects Of Deposition Parametersmentioning

confidence: 99%

Section: Effects Of Deposition Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Directed Energy Deposition (DED) Process: State of the Art

Ahn

2021

Int. J. of Precis. Eng. and Manuf.-Green Tech.

321

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show abstract

“…1(a), consists of an ALB-DWD head, a wire-feeding unit, a workpiece translation stage, a process-monitoring system and a continuous, 2.5-kW, fiber laser source with a wavelength of 1080 nm. Using a laser beam shaping unit in the ALB-DWD head [8,9], a collimated laser beam is transformed into an ALB. By means of two reflective mirrors, the ALB is guided coaxially to the axis of the wire-guiding tube and focused on the workpiece surface using focusing optics.…”

Section: Annular Laser Beam Wire-deposition Setup and Wipmentioning

confidence: 99%

Initial transient phase and stability of annular laser beam direct wire deposition

Kotar

Fujishima

Levy³

et al. 2019

CIRP Annals

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In this paper the stability of the annular laser beam (ALB) direct wire-deposition process, which enables process symmetry and a well-defined ALB workpiece irradiation proportion (WIP) and related energy input onto the workpiece and the wire surface is considered. Various initial process phase strategies with respect to different initial wire-end positions and WIPs were analysed based on the process visualization and outcome, and the melt pool temperature. It was shown that in addition to a precise synchronization of the mutually time-dependent ALB power, wire and workpiece feeding velocity, the fastest and the most robust transition into a stable stationary process could be achieved with the initial position of the wire-end on the workpiece surface. Additionally, the WIP was shown to have a strong and nonlinear influence on the process stability.

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“…Laser cladding is a coating technology that deposits multiple layers of composite material on the substrate to improve the physical properties of the work-piece such as wear resistance and corrosion resistance [1][2][3][4] . Laser cladding technology is widely used in surface enhancement and wear repair of parts [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Optimization of Process Parameters of Laser Cladding 304L Alloy Powder Based on Orthogonal Experiment

Shu¹,

Wang²,

He³

2020

Mech. Eng. Sci.

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In order to find the optimal combination of process parameters for laser cladding 304L alloy powder on the surface of 45 steel, a combination method of single factor test and multi-factor orthogonal experiment was used to perform the single pulse laser cladding experiment. The effects of process parameters (pulse current A, pulse width B, pulse frequency C,defocus distance D, scan velocity E) on the morphology and performance of cladding layer was studied by range analysis, and the optimal combination of cladding parameters is calculated by fuzzy comprehensive evaluation. The results show that different process parameters have different effects on the morphology of the cladding layer and scanning velocity E and defocus distance D are the most important influencing factor of cladding morphology. The effect on cladding width is D> C > A > B > E and the effect on cladding height is E > A > C > D > B. The optimal combination of cladding width is A4B4C4D4E2. The optimal combination of cladding high is A2B1C1D4E1. The comprehensive optimal process parameters are pulse current 210A, pulse width 3.6ms, pulse frequency 16Hz, defocus distance +10mm and scanning speed 240mm/min. The average hardness of the cladding layer, melting pool, heat-affected zone and substrate under the optimal process parameters is 406.2 HV0.5, 470.8 HV0.5, 230.5HV0.5 and 202.0HV0.5, respectively. The 304L cladding layer on 45 steel surface is stable in width, height and surface quality under comprehensive optimal parameters.

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Study of an annular laser beam based axially-fed powder cladding process

Cited by 32 publications

References 8 publications

Directed Energy Deposition (DED) Process: State of the Art

Directed Energy Deposition (DED) Process: State of the Art

Initial transient phase and stability of annular laser beam direct wire deposition

Optimization of Process Parameters of Laser Cladding 304L Alloy Powder Based on Orthogonal Experiment

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