Laser beam welding of heat-resistant mixed joints using laser-based pre- and post-heating

Saffer, J.; Dörres, T.; Schaumberger, Kerstin; Ermer, Jakob; Kaufmann, Florian; Wittmann, Alexander; Roth, Stephan; Schmidt, Michael

doi:10.1016/j.procir.2020.09.105

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…One advantage of using a secondary beam superimposed on the primary beam is the possibility of in-situ pre-heating or post-heating without the need for additional scans. The effects of laser based pre-heating and post-heating have previously been investigated by Saffer et al [32].…”

Section: Beam Shape Optimizationmentioning

confidence: 99%

A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

et al. 2021

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Keyhole laser beam welding (LBW) of 304L stainless steel sheets with a gap in between was numerically simulated with a three—dimensional, transient, multi—physical model for laser material processing based on the finite volume method (FVM). First, the model’s ability to reproduce experimental results on a relatively coarse computational mesh within reasonable computing time, so as to serve as process optimization tool, is presented. An example of process optimization is shown, wherein a given set of weld seam quality criteria is fulfilled by iteratively optimizing a secondary laser beam. The relatively coarse mesh, in combination with a good model calibration for the experimental conditions, allows for sufficiently fast simulations to use this approach for optimization tasks. Finally, using a finer spatial and temporal discretization, the dynamic processes in the vicinity of the keyhole leading to the formation of pores are investigated. The physical phenomena predicted by the simulation are coherent with experimental observations found in literature.

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Section: Beam Shape Optimizationmentioning

confidence: 99%

A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

et al. 2021

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“…Several researchers have discussed the phenomena during beam welding of grey cast iron with spheroidal graphite and proposed procedures for improved weldability in similar and dissimilar welds [8][9][10][11][12][13][14]. Rüthrich et al investigated the influence of an in situ heat treatment using an electron beam.…”

Section: Introductionmentioning

confidence: 99%

“…In order to manipulate the thermal cycle during welding, Vollmer et al [13] used electromagnetic induction to impose pre-and post heat-treatment on grey cast iron specimens welded by fiber-laser and reported a reduction of crack formation as well as hardness. In continuance of this approach, Saffer et al studied the capabilities of a defocused laser beam to enable a pre-and post heat-treatment of the weld seam during LBW and reported a reduction of hardness [14].…”

Section: Introductionmentioning

confidence: 99%

Laser Welding of Grey Cast Iron with Spheroidal Graphite-Influence of Process Parameters on Crack Formation and Hardness

Sommer

Lehto

Völkers

et al. 2021

Metals

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In the investigation at hand, sheets of ferritic and pearlitic grey cast iron with spheroidal graphite are welded using a fiber-laser. The influence of varying laser power and welding speed on the macroscopic characteristics of the weld seam and crack formation are analyzed and discussed. Substantial crack formation with crack densities of up to 2.93/cm are found. Furthermore, hardness measurements are conducted to evaluate the formation of brittle phases within the weld metal and heat-affected zone. Peak hardness values of up to 860 HV0.3 and 975 HV0.3 are identified in EN-GJS-400-15 and EN-GJS-700-2, respectively. Subsequently, a proposition on the dependence of crack formation on weld seam width is given. Furthermore, the influence of nickel-containing filler material on the microstructure, crack formation and hardness is studied. It can be derived from the results that laser-beam welding of grey cast iron with spheroidal graphite requires further research in order to achieve crack-free weld seams and hinder the formation of undesirable, brittle phases.

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Investigating Failure in Laser-Welded Joints of Microalloyed Steel: A Systematic Review

Saini,

Kaushik

2024

Trans Indian Inst Met

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Laser beam welding of heat-resistant mixed joints using laser-based pre- and post-heating

Cited by 4 publications

References 5 publications

A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

A Numerical Investigation of Laser Beam Welding of Stainless Steel Sheets with a Gap

Laser Welding of Grey Cast Iron with Spheroidal Graphite-Influence of Process Parameters on Crack Formation and Hardness

Investigating Failure in Laser-Welded Joints of Microalloyed Steel: A Systematic Review

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