Keyhole Welding

Ion, John C.

doi:10.1016/b978-075066079-2/50019-2

Cited by 8 publications

(5 citation statements)

References 63 publications

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“…A deep and narrow vapor cavity, the keyhole, is then formed, which allows multiple internal reflections of the beam and, consequently, very efficient power deposition. The keyhole is surrounded by molten material, forming a fusion zone, and by an adjacent solid distinct region, which is the HAZ [1,2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Nd: YAG Pulsed Laser Dissimilar Welding of UNS S32750 Duplex with 316L Austenitic Stainless Steel

et al. 2019

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Duplex stainless steels (DSSs), a particular category of stainless steels, are employed in all kinds of industrial applications where excellent corrosion resistance and high strength are necessary. These good properties are provided by their biphasic microstructure, consisting of ferrite and austenite in almost equal volume fractions of phases. In the present work, Nd: YAG pulsed laser dissimilar welding of UNS S32750 super duplex stainless steel (SDSS) with 316L austenitic stainless steel (ASS), with different heat inputs, was investigated. The results showed that the fusion zone microstructure observed consisted of a ferrite matrix with grain boundary austenite (GBA), Widmanstätten austenite (WA) and intragranular austenite (IA), with the same proportion of ferrite and austenite phases. Changes in the heat input (between 45, 90 and 120 J/mm) did not significantly affect the ferrite/austenite phase balance and the microhardness in the fusion zone.

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Section: Introductionmentioning

confidence: 99%

Nd: YAG Pulsed Laser Dissimilar Welding of UNS S32750 Duplex with 316L Austenitic Stainless Steel

et al. 2019

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“…This may lead to the formation of a keyhole, as it is similarly known in laser welding. 58 One 56 can also contribute to the formation of entrapped gas pores.…”

Section: Single Track Scansmentioning

confidence: 99%

Additive Manufacturing of Metals via Selective Laser Melting: Process Aspects and Material Developments

Kruth

Dadbakhsh²,

Vrancken³

et al. 2015

Additive Manufacturing

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“…In contrast, micro-laser spot welding offers several advantages over the micro-RSW process including non-contact joining, single-sided access, up to five times faster placement of spots, easy automation and flexibility in nugget size [14,15]. However, there are challenges associated with micro-laser welding as well, especially for joining ultra-thin sheets to thick sheets, such as (i) ensuring intimate contact between the mating surfaces [16], (ii) controlling heat input to avoid cutting through the thin upper sheet [17] and (iii) proper selection of laser welding parameters to control welding defects such as cracks, porosity or under-weld/no-weld conditions [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Substituting Resistance Spot Welding with Flexible Laser Spot Welding to Join Ultra-Thin Foil of Inconel 718 to Thick 410 Steel

et al. 2022

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This paper investigated various aspects of replacing existing micro-resistance spot welding (micro-RSW) with micro-laser spot welding for joining Inconel 718 thin foils to thick 410 steel stack-up to allow faster, non-contact joining together with flexibility in spot positioning and removal of tip dressing required for RSW electrodes. The joint quality was evaluated based on the mechanical strength, microstructural characteristics and joint strength at elevated temperature as these joints are often used for high-temperature applications. Experimental investigations were performed using micro-RSW and micro-laser spot welding to obtain the 90° peel and lap shear specimens, each comprising four spots. The obtained strength from laser joints was significantly higher than that of micro-RSW joints due to larger weld nugget formation and interface width. The process map for obtaining good quality welds was also identified, and about a 17% reduction in joint strength was obtained when welded specimens were subjected to elevated temperature (i.e., 500 °C) in comparison with room temperature. This reduction was compensated for using the flexibility of laser welding to add two extra spots. The overall performance of the micro-laser spot welds was found to be better than the micro-RSW considering joint strength, flexibility in placing the spots and time to produce the welds.

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Keyhole Welding

Cited by 8 publications

References 63 publications

Nd: YAG Pulsed Laser Dissimilar Welding of UNS S32750 Duplex with 316L Austenitic Stainless Steel

Nd: YAG Pulsed Laser Dissimilar Welding of UNS S32750 Duplex with 316L Austenitic Stainless Steel

Additive Manufacturing of Metals via Selective Laser Melting: Process Aspects and Material Developments

Substituting Resistance Spot Welding with Flexible Laser Spot Welding to Join Ultra-Thin Foil of Inconel 718 to Thick 410 Steel

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