Emission of scattered radiation from the process zone of welding processes using high-power diode lasers

Hilck, Alexander; Hustedt, Michael; Seffer, Oliver; Nothdurft, Sarah; Hermsdorf, Jörg; Kaierle, Stefan

doi:10.1016/j.procir.2022.08.099

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…High power semiconductor lasers have broad applications in industrial, medical, military and communication fields because of their small size, high efficiency, broad wavelength coverage, high reliability, long life, and direct modulation [1,2]. The semiconductor laser bar has the significant advantage of high output power.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermal characteristics of microchannel-cooled photonic crystal laser diode bars

Zheng

Qu²,

Liu³

et al. 2022

Semiconductor Lasers and Applications XII

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Photonic crystal laser diode bars have the advantages of low vertical divergence angle and high resistance to catastrophic optical mirror damage. However, with the increase of output power, the waste heat problem is becoming more serious, affecting the further improvement of laser performance. Therefore, it is of great significance to study the thermal characteristics of bars. In this paper, the fluid-solid coupling conjugate heat transfer model of a microchannel cooled photonic crystal laser diode bar is established through the finite element method (FEM) and computational fluid dynamics (CFD) numerical methods. The transient thermal behavior, steady-state characteristics, and temperature distribution of photonic crystal laser diode bars under continuous (CW) operating states are studied in detail. The simulation results show that the junction temperature is 55.48°C, and the thermal resistance is 0.48 K/W. The closer the emitter is to the bar center, the easier the thermal crosstalk occurs. In the experiment, the continuous output power of the photonic crystal laser bar is 112.13 W at 120 A, the junction temperature is 57.14 °C, and the thermal resistance is 0.50 K/W. The simulations of bars are consistent with the experiment.

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Section: Introductionmentioning

confidence: 99%

Analysis of thermal characteristics of microchannel-cooled photonic crystal laser diode bars

Zheng

Qu²,

Liu³

et al. 2022

Semiconductor Lasers and Applications XII

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Ultra high power laser cutting of 1-m reinforced concrete with gravity

Kawahito,

Ozaki,

Mori

et al. 2024

Optics and Lasers in Engineering

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Investigations on laser beam welding of thick steel plates using a high-power diode laser beam source

Seffer

Nothdurft

Hilck

et al. 2022

Journal of Laser Applications

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For joining of thick steel plates, commonly arc welding and partially laser-arc hybrid welding are used. Both techniques offer individual disadvantages besides their advantages. Arc welding processes are typically characterized by low welding speeds, high heat inputs, high distortions, and high filler material consumptions. Laser-arc hybrid welding processes are limited to weldable material thicknesses regarding weld imperfections as well as the ability to bridge gaps. Therefore, the investigations presented are about high-power diode laser beam welding of steel with plate thicknesses t between 15 and 30 mm using output powers PL of up to 60 kW and welding speeds v between 0.5 and 1.0 m/min. The welding experiments contain butt welds by using weld backing materials. Among other things, influence of energy per unit length (laser beam power PL, welding speed v), focal position z, and plate thickness t are analyzed for different reproducible processes. The evaluation of weld seams includes visual inspection, metallographic analyses regarding geometric characteristics, and weld imperfections as well as radiographic inspections. The investigations show achievable qualities and characteristics of the weld seams depending on the plate thickness t by using high-power diode laser beam sources. Weld seams on plates with thicknesses t of 15 and 22 mm were welded without cracks or other weld imperfections according to metallographic analyses and radiographic testing by using a laser beam power PL of 40 kW and the suitable process parameters developed. As a result, relatively high plate thicknesses t can be welded in a single layer with high quality as well as comparatively high welding speed v.

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Emission of scattered radiation from the process zone of welding processes using high-power diode lasers

Cited by 3 publications

References 2 publications

Analysis of thermal characteristics of microchannel-cooled photonic crystal laser diode bars

Analysis of thermal characteristics of microchannel-cooled photonic crystal laser diode bars

Ultra high power laser cutting of 1-m reinforced concrete with gravity

Investigations on laser beam welding of thick steel plates using a high-power diode laser beam source

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