Influence of focal spot diameter and beam oscillation on the process efficiency of laser beam welding utilizing a direct diode laser

Schaumberger, Kerstin; Mann, Vincent; Mödl, Michael; Hofmann, Konstantin; Stein, Stefan; Roth, Stephan; Schmidt, Michael

doi:10.1016/j.procir.2018.08.149

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…In the case of laser welding of 321 SS, high cooling rates lead to the fact that not all of the δ-ferrite is transformed into austenite [20]. Technological methods such as beam defocusing, wobbling or oscillations (longitudinal, transverse, circular) or the concurrent heating [21,22,23,24,25] are used to reduce the cooling rates during laser welding and electron beam welding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Kuryntsev

2019

Materials

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The effect of heat treatment of welded joints made of steel 321 on corrosion resistance, phase composition, residual stresses, and distribution of alloying elements was studied using optical microscope (OM) and scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), X-ray diffraction (XRD), and intergranular corrosion testing (IGC). Samples previously obtained by the authors using defocused laser beam, which led to the formation of directionally crystallized austenite with lathy and skeletal δ-ferrite, were investigated. Based on X-ray diffraction studies in the base metal, the maximum number of peaks of various phases was presented, which decreased after exposure to the heating effect of the welding process and subsequent heat treatment. The distribution of alloying elements, in particular, Ti and Si, was significantly affected by heat treatment depending on the regimes. A spot chemical analysis showed that the nickel content differs in δ-ferrite and austenite by 1.5%–2% whereas the chromium content in these phases is not significantly different. Tests have shown that all samples have high resistance to intergranular corrosion, which can be explained by the insufficient dissolution of titanium carbides in austenite and the absence of chromium carbides formation along austenite grain boundaries, due to high cooling rates when welding by a defocused laser beam, and as a result, the high δ-ferrite content in which chromium dissolves.

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Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Kuryntsev

2019

Materials

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“…У цьому випадку розподіл енергії зазвичай моделюється гаусовим законом, а ефективний діаметр модової плями вважається приблизно постійним вздовж усієї довжини лінії [6]. Характерно, що навіть під час практичних досліджень у напрямку підвищення просторової когерентності випромінювання міцних промислових лазерів [17] розподіл енергії у модовій плямі також моделюється гаусовою функцією. Тому розподіл енергії  vx ( , ) у модовій плямі в полярних координатах будемо вважати гаусовим у радіальному напрямку…”

Section: теоретичні основи методикиunclassified

Method of calculating the optical fiber geometric parameters with multiple cores

Odegov,

Tatarnytska

2021

ПТ

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The paper considers a simplified method for calculating the geometric parameters of an optical fiber with many cores. Such a fiber allows for an increase in the throughput of fiber-optic transmission systems by the method of spatial multiplexing. The proposed technique is based on the concept of light energy distribution in the mode spot and the allowable level of mutual influence between different cores. Algorithmic and software that implements the proposed technique has been developed. A comparative analysis of the triangulation and rectangular structure of fiber with many cores was performed. The technique considers the influence options from the nearest cores and the far layers cores. The analysis of the stability of the received results to minor deviations of actual parameters from the accepted ones in the model is executed. The technique is resistant to minor deviations in the shape of the cores from the circular and to small bends of the optical fiber. The method’s theoretical basis is used representations of wave optics and relatively simple representations of geometric optics. The obtained formulas are quite simple to analyze. Therefore, the obtained results can be offered for fast analysis of complex geometric structures of an optical fiber with many cores. Direct measurements or more complex theories compared the obtained results with the known estimates. It is shown that more than 100 cores can be concentrated in a fiber with a diameter of 200-400 μm, taking into account the typical values of noise in real fiber-optic transmission systems. That is, with a slight increase in the size of the optical cable, you can increase the total transmission rate by more than 100 times.

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Welding characteristics and mechanical property of rotating laser welding-brazing of aluminum alloy to steel

Cai

Xie

Wang

et al. 2022

Optics & Laser Technology

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Influence of focal spot diameter and beam oscillation on the process efficiency of laser beam welding utilizing a direct diode laser

Cited by 3 publications

References 5 publications

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Method of calculating the optical fiber geometric parameters with multiple cores

Welding characteristics and mechanical property of rotating laser welding-brazing of aluminum alloy to steel

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