Effects of interface gap and shielding gas on the quality of alloy AA6061 fiber laser lap weldings

Pellone, Luca; Inamke, G.V.; Hong, Kyung-Min; Shin, Yung C.

doi:10.1016/j.jmatprotec.2019.01.025

Cited by 27 publications

(10 citation statements)

References 23 publications

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“…The effects of parameters on the machined surface structure were studied, and the impact levels were determined. Laser pulse energy, duration, spot size and gas type are the key process parameters to obtain the machined product properties such as appearance, depth, width, amount of vaporized material and minimum defect [21,23,32,33].…”

Section: Experimental Design According To Taguchi Methodsmentioning

confidence: 99%

“…Due to the focusing of the laser beam at a point above the material, a plasma plume can form on the material resulting from a high energy density. Absorption of the laser energy by the plasma via the inverse bremsstrahlung causes less energy transfer to the material [33]. While the plasma slows down the transfer of heat to the lower material levels, it causes the material to spread over a larger area.…”

Section: Experimental Design According To Taguchi Methodsmentioning

confidence: 99%

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Laser parameter optimization for surface texturing of inconel 625

Fi̇dan

Canel

Sınmazçelik

2021

Materialwissenschaft Werkst

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The optimum laser parameters required for the inconel 625 alloy surfaces to have the desired properties have been determined. Process parameters were optimized to get maximum heat affected zone depth (HAZ) and width and maximum aspect ratio and minimum defect outside of the spot area independently of each other. Also, the effect rates of the examined process parameters on the treated surface quality were determined separately for each surface feature. As a result of optimization using Taguchi method, the most effective parameters to obtain the desired surface were obtained as gas type with 72.26 % for heat affected zone depth, gas type with 90.46 % for heat affected zone width, gas type with 81.57 % for aspect ratio, pulse energy with 30.99 % for minimum defect outside of the spot area. The best results were obtained on the surfaces obtained as a result of the confirmation experiment with the new parameters obtained with the Taguchi method. Since the results of the confirmation experiments are highly compatible with the results suggested by the Taguchi method, the Taguchi method may be concluded as reliable in the laser ablation of the inconel 625 surface.

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Section: Experimental Design According To Taguchi Methodsmentioning

confidence: 99%

Section: Experimental Design According To Taguchi Methodsmentioning

confidence: 99%

Laser parameter optimization for surface texturing of inconel 625

Fi̇dan

Canel

Sınmazçelik

2021

Materialwissenschaft Werkst

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“…The deposition rate increases and becomes uniform on increasing the flow of carrier gas. Pellone et al 157 investigated the influence of shielding gas during the laser lap welding of alloy AA6061. The porosity was found to be reduced after using helium as shielding gas.…”

Section: Effect Of Shielding Gas and Absorption Due To Plasma Plumementioning

confidence: 99%

State-of-the-art review on laser cladding process as an in-situ repair technique

Raj

Maity

Das

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The present work reviews the laser cladding process as a repairing technique and the conventional repairing techniques and different heat source models. In this review work, the authors have tried to address the various traditional methods studied for repairing and surface modification. The dominantly used heat source model for numerical modelling of the repairing techniques and the mechanism of the laser cladding process, along with its advantages over the conventional repairing techniques, is also reviewed. This paper also focuses on the predominantly used laser of high power for the cladding process and the effect of process parameters on the quality of the clad layer. The different materials used as clad materials for repairing purposes during the laser cladding process have also been discussed briefly. In this paper, the authors have surveyed literature from different regions of the globe and considered the literature since 1969. This review discusses the various conventional repairing techniques used for repairing, heat source model, process parameters, and different materials used in the laser cladding process. The authors have also briefed the advantages, disadvantages, and application in each of the sections. The use of laser cladding for in-situ repairing process, development of a precise model, use of low-power laser, and application of laser cladding for actual engineering components was also considered in future research work.

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“…Additionally, the control of bead shape is important because it determines the resolution and layer height achieved in the process. It is known that for laser welding and other AM techniques the shielding conditions used can have an important effect on the melting behaviour, geometry and microstructure of the manufactured parts [4,5]. Hence, it is expected that optimizing the shielding atmosphere during PBF could have a significant impact on the process characteristics and can be used as a way to control bead profile and minimize defects.…”

Section: Introductionmentioning

confidence: 99%

Effect of shielding conditions on bead profile and melting behaviour in laser powder bed fusion additive manufacturing

Caballero

Suder

Chen

et al. 2020

Additive Manufacturing

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A series of experiments were performed using a 500W continuous wave fibre laser on a single powder bed layer using different processing variables. The aim was to investigate the effect of different shielding conditions on melting behaviour and bead profile in laser powder bed fusion (PBF). Through high-speed imaging, it was found that under an argon atmosphere a strong plasma plume is generated from the meltpool. Laser beam-plasma plume interactions caused strong instabilities during melting, including laser wandering, track instability and continuous fluctuations between melting regimes (conduction and keyhole). Hence, it was not possible to control the profile of the melted tracks under this condition. By using a helium atmosphere, a smaller plasma was obtained, reducing the disruptions caused by laser-plasma interactions. This led to a stable melting regime that allowed control of the melt bead profile.This condition was used to study the effect of laser-material fundamental interaction parameters on the bead geometry in powder bed melting. It was found that during melting of single tracks, the dominant regime of melting is conduction for the range of parameters tested.Penetration and melt width were found to increase with increasing energy density. For longer interaction times, melt widths were found to be up to ten times the size of the beam diameter used. Fluid flow modelling showed that this is due to strong melt flow as consequence of surface tension gradients generated by very high temperature gradients.

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Effects of interface gap and shielding gas on the quality of alloy AA6061 fiber laser lap weldings

Cited by 27 publications

References 23 publications

Laser parameter optimization for surface texturing of inconel 625

Laser parameter optimization for surface texturing of inconel 625

State-of-the-art review on laser cladding process as an in-situ repair technique

Effect of shielding conditions on bead profile and melting behaviour in laser powder bed fusion additive manufacturing

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