Experimental study on weld formation of Inconel 718 with fiber laser welding under reduced ambient pressure

Li, Liqun; Peng, Genchen; Wang, Jiandong; Gong, Jianfeng; Li, Huizhi

doi:10.1016/j.vacuum.2018.02.008

Cited by 34 publications

(7 citation statements)

References 19 publications

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“…At elevated pressure, melt pool penetration depth decreases and width increases, relative to the nominal results at 0 psig. This is consistent with sub-atmospheric studies of L-PBF and laser welding experiments, where weld depth increased and width decreased with lower pressure [14,15,16,17,18,22]. In the present elevated pressure experiments, the normalized enthalpy at which d/w exceeds 0.5 grows slightly with pressure (e.g., approximately ∆H/h s = 1.6 at 150 psig, and ∆H/h s = 2.1 at 300 psig), and the deviation in d/w grows with increased normalized enthalpy.…”

Section: Laser Melting At Elevated Pressuresupporting

confidence: 90%

“…Recent work focusing on laser welding and L-PBF in sub-atmospheric conditions suggests that ambient gas pressure may be used to expand such process windows. Specifically, weld penetration increases and melt pool width decreases with decreasing pressure below 1 bar [14,15,16,17,18]. For example, Pang et al [19] developed a 3D multiphase model of a laser weld keyhole and the resultant vapor plume, and found that adding ambient pressure into the simulation resulted in much lower (and more accurate) gas plume velocity estimates.…”

Section: Introductionmentioning

confidence: 99%

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A Testbed for Investigation of Selective Laser Melting at Elevated Atmospheric Pressure

Griggs¹,

Gibbs²,

Baker³

et al. 2021

Preprint

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Metal additive manufacturing (AM) by laser powder bed fusion (L-PBF) builds upon fundamentals established in the field of laser welding which include the influence of gas and plume dynamics on weld depth and quality. L-PBF demands a thorough investigation of the complex thermophysical phenomena that occur where the laser interacts with the metal powder bed. In particular, melt pool turbulence and evaporation are influenced by the ambient gas chemistry and pressure. This paper presents the design and validation of high pressure laser melting (HPLM) testbed; this accommodates bare metal plate samples as well as manually-coated single powder layers, and operates at up to 300 psig. The open architecture of this testbed allows for full control of all relevant laser parameters in addition to ambient gas pressure and gas flow over the build area. Representative melt tracks and rasters on bare plate and powder are examined in order to validate system performance, and preliminary analysis concludes that pressure has a significant impact on melt pool aspect ratio. The HPLM system thus enables careful study pressure effects on processing of common L-PBF materials, and can be applied in the future to materials that are challenging to process under ambient pressure, such as those with high vapor pressures.

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Section: Laser Melting At Elevated Pressuresupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A Testbed for Investigation of Selective Laser Melting at Elevated Atmospheric Pressure

Griggs¹,

Gibbs²,

Baker³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…This is the reason for lower heat input when welding Inconel 718. Laser welding could be an effective method because its low heat input and faster cooling rates [14,15]. Higher cooling rates greatly reduce the Laves phase formation in the part [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on heat affected zone microstructure of additively manufactured Inconel 718

Lindqvist,

Kivirasi,

Lipiäinen

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Laser powder bed fusion for metals is a method of producing end use components for industrial use. Powder bed fusion machines are relatively small, and are usually used to create only the critical part of the larger assembly. Therefore, L-PBF manufactured parts must be attached to each other for example by welding. The industrial world needs to be able to join the printed superalloy components to the traditionally manufactured components to reach better corrosion, wear and/or heat resistance in selected parts in an assembly. The problem is that there is limited amount of information about the suitable welding parameter values for these applications. This study examines how the standard heat treatment cycles affect to the quality of the weld, and if the post-heat treatment is reducing undesired phases in the heat affected zone. Test has shown that post heat treatment highlights cuboidal shaped niobium rich carbides throughout the material to the heat affected zone grain boundaries.

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“…The results illustrated that the microstructure of the weld zone near Inconel 625 was columnar dendrites, while near the S.S 316, metal was predominantly cellular. Li et al [22] evaluated the quality of laser welding performed by fiber laser on Inconel 718. The results indicated that the welding quality and appearance could be bright and smooth by reducing the ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of temperature distribution and melt flow in fiber laser welding of Inconel 625

Tlili

Băleanu

Sajadi

et al. 2022

Int J Adv Manuf Technol

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In these days, laser is a useful and valuable tool. Low input heat, speed, accuracy, and high controllability of laser welding have led to widespread use in various industries. Nickel-based superalloys are creep-resistant materials used in high-temperature conditions. Also, these alloys have high strength, fatigue, and suitable corrosion resistance. Inconel 625 is a material that is strengthened by a complex deposition mechanism. Therefore, the parameters related to laser welding affect the microstructure and mechanical properties. Therefore, in this study, the effect of fiber laser welding parameters on temperature distribution, weld bead dimensions, melt flow 2 velocity, and microstructure was investigated by finite volume and experimental methods. In order to detect the temperature history during continuous laser welding, two thermocouples were considered at a distance of 2 mm from the welding line. The heat energy from the laser beam was modeled as surface and volumetric heat flux. The results of numerical simulation showed that Marangoni stress and buoyancy force are the most important factors in the formation of the flow of liquid metal. Enhancing the laser power to 400 W led to the expansion of the width of the molten pool by 1.44 mm, which was in good agreement with the experimental results.Experimental results also showed that increasing the temperature from 500 °C around the molten pond leads to the formation of a coarse-grained austenitic structure.

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Experimental study on weld formation of Inconel 718 with fiber laser welding under reduced ambient pressure

Cited by 34 publications

References 19 publications

A Testbed for Investigation of Selective Laser Melting at Elevated Atmospheric Pressure

A Testbed for Investigation of Selective Laser Melting at Elevated Atmospheric Pressure

Effect of post-weld heat treatment on heat affected zone microstructure of additively manufactured Inconel 718

Numerical and experimental analysis of temperature distribution and melt flow in fiber laser welding of Inconel 625

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