Diode laser welding of stainless steel 304L

Alcock, John; Baufeld, Bernd

doi:10.1016/j.jmatprotec.2016.09.019

Cited by 27 publications

(9 citation statements)

References 9 publications

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“…where E is the energy supplied by the power source, q the energy generated by the power source, L the joint length, t the welding time, P the generated power, and V the welding speed. Alcock and Baufeld [6], Tan and Shin [7],…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis and multi-objective optimization of tungsten inert gas (TIG) welding based on numerical simulation

Paes

Andrade

Lobato

et al. 2022

Int J Adv Manuf Technol

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In welding processes, many factors contribute in achieving a required quality of the welds. Those factors are numerous and they may interact with each other, affecting response parameters such as welding penetration and the Heat Affected Zone (HAZ) size. Some factors are more important while the influence of others is negligible.To find an optimum factor combination in order to maximize penetration and minimize the HAZ is not an easy task. This contribution is aimed to evaluate the influence of welding energy (E) versus the influence of current (I) and welding speed (Vw) on the penetration and HAZ volume in the autogenous Tungsten Inert Gas (TIG) welding process. For this purpose, phenomenological and empirical models are proposed. The first considers an in-house Finite Volume numerical model, and the second is based on Response Surface Method. A sensitivity analysis of the empirical model using two strategies is also performed. In addition, to determine the best-operating conditions, a multi-objective optimization problem is proposed and solved. The presented empirical models were found to provide good concordance in terms of coefficient of determination and p-value, indicating its significance. Each model (with one or more independent variables) represents detailed information about the physical process and can be used for optimization. The sensitivity analysis demonstrates that the current affects penetration and HAZ volume much stronger than the welding speed does. Physically, this is due to the fact current has linear (arc coupling) and non-linear (Joule effect and pressure gradient) influence, and the welding speed contributes linearly, modulating the heat conduction. Finally, it was demonstrated a compromise between the penetration and the HAZ volume by addressing multi-objective optimization. In this context, point C (I = 250 A; VW= 24.8 cm/min) of the Pareto curve is the optimal option for operation since it provides a lower relative HAZ volume while keeping the same penetration and higher productivity (welding speed).

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Section: Introductionmentioning

confidence: 99%

Sensitivity analysis and multi-objective optimization of tungsten inert gas (TIG) welding based on numerical simulation

Paes

Andrade

Lobato

et al. 2022

Int J Adv Manuf Technol

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“…In some alloys, austenite is stable from room temperature to the melting temperature range. The predominance of an austenitic structure in these steels gives rise to their excellent ductility and toughness [15,16,17,18,19].…”

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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“…Parameters, such as welding speed, power and focal point, have an eect on the stability [14,23]. Parameters aect the quality and prole of the weld bead.…”

Section: Parameters Eect On Laser Weldingmentioning

confidence: 99%

Overview of laser-welded thin-walled joints fatigue performance and a statistical method for defect analysis

Kokko

Vaara

Kuivaniemi

et al. 2020

RakMek

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Welding always has a deteriorating effect on fatigue strength in structures under dynamic loading. Weld joints induce discontinuity in structure geometry and the microstructure. Welding induced discontinuity, and defects allow for potential fatigue cracks that lead to the failure of welded parts or structures. The laser welding process differs from conventional arc welding in process and joint type. The most significant advantage in laser welding comes from the deep penetrating mode of welding, which also brings challenges to the soundness of the weld. The benefits of laser welding are most evident in the manufacture of sheet metal products such as sandwich panels. In literature, laser welding is generally dealt with by using different parts of the overall process without taking the fatigue point of view into account. In this article, the process of laser welding is discussed, while keeping fatigue strength in perspective. The fatigue data of laser welded joints is studied in order to find defect distribution that explains fatigue strength distribution in tests. The suitability of traditional fatigue assessment for laser welding is also discussed.

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Diode laser welding of stainless steel 304L

Cited by 27 publications

References 9 publications

Sensitivity analysis and multi-objective optimization of tungsten inert gas (TIG) welding based on numerical simulation

Sensitivity analysis and multi-objective optimization of tungsten inert gas (TIG) welding based on numerical simulation

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

Overview of laser-welded thin-walled joints fatigue performance and a statistical method for defect analysis

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