Characteristics of plasma plume in fiber laser welding of aluminum alloy

Gao, Ming; Chen, Cong; Hu, Ming; Guo, Lianbo; Wang, Zemin; Zeng, Xiaoyan

doi:10.1016/j.apsusc.2014.11.136

Cited by 68 publications

(12 citation statements)

References 24 publications

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“…Kawahito et al [14] found that the plume induced when fibre laser welding stainless steel at 10 kW was not significant enough to influence penetration depth. Gao et al [19] on the other hand, studied the effect of laser power on the characteristics of fibre laser induced plume via emission spectroscopic analysis and found that a strong plasma shielding effect dominated by inverse bremsstrahlung absorption appeared when a laser power greater than 5 kW was used. The relatively small influence of ionisation on fibre laser induced plume was expected to enhance the welding process stability and lower the threshold power density for keyhole formation because of the enhanced Fresnel absorption and reduced beam attenuation and scattering.…”

Section: Introductionmentioning

confidence: 99%

The effect of Ar and He shielding gas on fibre laser weld shape and microstructure in AA 2024-T3

Ahn

Chen

et al. 2017

Journal of Manufacturing Processes

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Section: Introductionmentioning

confidence: 99%

The effect of Ar and He shielding gas on fibre laser weld shape and microstructure in AA 2024-T3

Ahn

Chen

et al. 2017

Journal of Manufacturing Processes

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“…The emitted radiation is less absorbed by the plasma above the surface of the welded material. However, Gao et al [55] found when the laser power was in their study lower than 5 kW, the laser power absorbed by the plume was no more than 5 % because it was a weakly ionized plasma. At that stage, the plasma shielding effect could be ignored, and the weld penetration depth increased with laser power proportionally.…”

Section: Computed Tomographymentioning

confidence: 88%

Influence of shielding gases on porosity during laser welding of AZ31B magnesium alloy

Vyskoč¹

2021

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The paper deals with the evaluation of the shielding gases' influence on the porosity of AZ31B magnesium alloy weld joints produced with disk laser. Butt weld joints were produced under different shielding gas types, namely Ar 4.6, He 4.6, Ar + 5 vol.% He, Ar + 30 vol.% He. Light and electron microscopy, computed tomography, microhardness measurements, and tensile testing were used to evaluate weld joint properties. He shielded weld joints were the narrowest ones (1.79 mm). On the other hand, Ar shielded weld joints exhibited the largest weld width (2.11 mm). The choice of shielding gas had a significant influence on the porosity level of welds. The lowest porosity was observed in weld joint produced in Ar 4.6 shielding atmosphere (only 0.05 mm 3 ), while the highest level of porosity was detected in weld joint produced in pure He 4.6 (0.41 mm 3 ). K e y w o r d s : laser welding, AZ31B magnesium alloy, AZ61 filler wire, porosity

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“…The plasma plume 38 attenuates the beam and reduces the amount of energy transferred to the workpiece, causing the phenomena known as plasma absorption 17 or plasma shielding effect. 37 On the other hand, the other four samples (1.3 to 1.6) showed full penetration. Considering samples 1.3 to 1.6, it could be seen that the penetration was not significantly influenced by the CO 2 content or current mode.…”

Section: Cross-sections and Geometric Characteristicsmentioning

confidence: 90%

“…Sample 1.2 (Ar þ 2% CO 2 and pulsed current) showed lack of penetration, which is an unacceptable imperfection, according to the ISO 12932:2013 standard. 35 Chung et al 36 showed how Ar-rich welding gases result in low penetration in LBW joints, due to the formation of a plasma plume (also known as laser-induced plasma), 37 which is highly concentrated above the workpiece. The plasma plume 38 attenuates the beam and reduces the amount of energy transferred to the workpiece, causing the phenomena known as plasma absorption 17 or plasma shielding effect.…”

Section: Cross-sections and Geometric Characteristicsmentioning

confidence: 99%

Influence of welding gases and filler metals on hybrid laser-GMAW and Laser-FCAW welds

Wallerstein

Vaamonde

Prada

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hybrid Laser-Arc Welding (HLAW) is a relatively new joining technique that combines advantages from both laser beam welding and arc welding. The interaction between laser beam and arc welding provides advantageous synergic effects, especially for thick joints. On the other hand, this interaction brings extra complexity to HLAW, limiting its acceptance in industry. Therefore, it is still necessary to elucidate some features of HLAW, such as the influence of parameters and consumables on the characteristics of the resulting joints. In the present study, the effects of welding gases (Ar + CO2 in different proportions) and filler metals (solid and flux-cored wires) on thick S355 structural steel joints are assessed. The best welds in terms of geometric characteristics, microstructures, and mechanical behavior were fabricated with high CO2 content welding gases and flux-cored welding wires. The use of flux-cored wires promoted higher penetration, lower hardness, and formation of acicular ferrite, avoiding the formation of martensite encountered in joints welded with solid wires. Moreover, the application of flux-cored wires could lead to cost savings in future applications, by reducing the laser power required to produce sound joints.

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Characteristics of plasma plume in fiber laser welding of aluminum alloy

Cited by 68 publications

References 24 publications

The effect of Ar and He shielding gas on fibre laser weld shape and microstructure in AA 2024-T3

The effect of Ar and He shielding gas on fibre laser weld shape and microstructure in AA 2024-T3

Influence of shielding gases on porosity during laser welding of AZ31B magnesium alloy

Influence of welding gases and filler metals on hybrid laser-GMAW and Laser-FCAW welds

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