Influence of an oxygen-free atmosphere on laser beam brazing of aluminium with prior surface deoxidation by pulsed laser radiation

Aman, Witali; Nothdurft, Sarah; Hermsdorf, Jörg; Kaierle, Stefan; Szafarska, Maik; Gustus, René; Maus‐Friedrichs, W.; Overmeyer, Ludger

doi:10.1016/j.procir.2022.08.122

Cited by 5 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A tangible example for deoxidation during a process is laser beam brazing of aluminum alloys, where a pulsed laser beam with 45 ns pulse duration is employed for deoxidation. [ 46 ] At pulse energies of 60 μJ no deoxidation effect is observed. At 180 μJ, the existing oxide layer is reduced and the subsequent laser beam brazing process is facilitated (see Section 3.2 for further information).…”

Section: Methods and Technologymentioning

confidence: 99%

“…Cross-sections of bead on plate seams brazed under silane-doped atmosphere on AlMgSi1 with a wire feed of 2.0 m min À1 . Reproduced with permission [46] Copyright 2022, Elsevier. [46] Copyright 2022, Elsevier.…”

Section: Compound Castingmentioning

confidence: 99%

“…Adjusting the spot diameter of the cw source to 2.9 mm and deoxidizing with the pw beam prior to brazing with the cw beam instead of using superimposed beams led to significantly less melting of the base material in silane‐doped argon atmosphere but higher wetting angles. [ 46 ] Seams produced at various laser beam powers p cw and pulse energies E p of 120 μJ or 180 μJ feature sufficient wetting angles without critical melting of the base material and exhibit a metallurgical bond as shown in Figure 8. Experiments in argon at similar parameters did not produce a seam even at p cw = 2.4 kW and E p = 240 μJ.…”

Section: Oxygen‐free Production Processesmentioning

confidence: 99%

“…Aman et al tested this approach for aluminum alloys with high magnesium content, e.g., AlMg3 (EN AW‐5754), which are only brazeable with corrosive fluxes. [ 46 ] Melting of the base material already occurred at low laser beam powers of around 1.4 kW, therefore the challenge to increase the seam quality while reducing melting remains for those alloys. On the microscopic scale, wetting angles of around 30° were achieved for AlMgSi1, here the challenge is to achieve those angles on the macroscopic scale as well.…”

Section: Oxygen‐free Production Processesmentioning

confidence: 99%

“…Figure 9. a) Comparison of bead on plate seams brazed under pure argon and b) silane-doped argon atmosphere with p cw = 2.4 kW and E Puls = 240 μJ on AlMgSi1. Reproduced with permission[46] Copyright 2022, Elsevier.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Oxygen‐Free Production—From Vision to Application

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Methods and Technologymentioning

confidence: 99%

Section: Compound Castingmentioning

confidence: 99%

Section: Oxygen‐free Production Processesmentioning

confidence: 99%

Section: Oxygen‐free Production Processesmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Oxygen‐Free Production—From Vision to Application

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

Effect of silane-doped argon shielding gases for gas metal arc welding of S355

Treutler,

Neef,

Wesling

2024

Weld World

View full text Add to dashboard Cite

The welding of steel grades relies primarily on the interaction of the weld metal with doped oxygen components of the shielding gas. This mainly serves to decrease the viscosity and reduce the surface tension of the melt in order to achieve an adjusted material transition. Interference with the ambient atmosphere is undesirable in this context. In order to prevent material-related changes in the microstructure, slag initiators are admixed which promote the precipitation of low-density oxides on the weld seam surface. Manufacturing technology is increasingly striving to eliminate the interaction of atmospheric oxygen in the production process. It is primarily intended to counteract the negative effects of oxygen during manufacturing. For this objective, silane-doped gases for subtractive manufacturing processes and additive manufacturing via the PBF-LB/M process have been considered. Small amounts of silane in conventional inert shielding gases allow partial pressures of oxygen that are comparable to a high vacuum. In the scope of this publication on investigations for welding applications, blind welds on S355 substrate plates were performed using G3Si1 filler material. In addition to the recommended M21, an argon shielding gas with 1.5% silane doping and argon 4.6 are applied for welding. Apart from the observation of the resulting energy input, the weld seams are metallographically characterized. For this purpose, the formation of silicates on the weld seam surface and the development of the weld seam within the base material are investigated. The volume of the weld seam is reduced as a result of the silane doping compared to the M21 application. The composition of the weld metal is significantly influenced by the silane content, leading to an increased manganese content in particular. The silane doping results in an intensified formation of an acicular bainitic structure and an accompanying hardening within the weld metal.

show abstract