Specific features of the welding of metals by radiation of high-power fiber laser

Yermachenko, Valery M.; Kuznetsov, A. P.; Petrovskiy, V N; Prokopova, N M; Strel'tsov, A P; Uspenskiy, S A

doi:10.1134/s1054660x11160043

Cited by 37 publications

(11 citation statements)

References 15 publications

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“…As it is seen from Fig. 6, the instrument makes it possible to monitor the welding process: formation of small molten pools, wave patterns on the weld seam, flows and fluctuations in the melt [20]. The same group obtained important results on the modification of the cathode surface, including cases with the intense background radiation of non-equilibrium low-temperature plasma of erosive capillary discharge [21].…”

Section: Requirements For the Brightness Amplifiers Of Active Opticalmentioning

confidence: 84%

From a metal vapor laser projection microscope to a laser monitor (by the 50 year-anniversary of metal vapor lasers)

Евтушенко

2015

SPIE Proceedings

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The paper presents the history of active optical systems development from a laser projection microscope to a laser monitor. The examples of object visualization and diagnostics of high speed processes hidden by the intense background radiation are discussed. These are the processes of laser-surface interaction, self-propagating high-temperature synthesis (SHS), the corona discharge in the air, the nanoparticle production process using a high-power fiber laser, and etc. The results obtained by different research groups suggest that high-speed metal vapor brightness amplifiers and active optical systems based on them need further research, development and novel applications.

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Section: Requirements For the Brightness Amplifiers Of Active Opticalmentioning

confidence: 84%

From a metal vapor laser projection microscope to a laser monitor (by the 50 year-anniversary of metal vapor lasers)

Евтушенко

2015

SPIE Proceedings

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“…Compared with the plasma induced by a CO 2 laser and an arc [13,16,20,22,29], the plasma induced by the fiber laser has a lower electron temperature. This result reveals that the plasma has a lower absorptivity to a fiber laser than to a CO 2 laser [7,16,21]. The electron density of the keyhole plasma indicated in figure 5(a) changes from 7.54 × 10 22 m −3 to 10.16 × 10 22 m −3 .…”

Section: Calculation Of Plasma Parametersmentioning

confidence: 91%

“…In our research team, Jin et al and Zhang et al have done some work on the keyhole plasma during low power CO 2 laser deep penetration welding, by using the 'sandwich' experimental method [17][18][19]. In contrast, the electron temperature of the plasma induced by a fiber laser is much lower than that generated during the CO 2 laser welding process [11,[20][21][22], and the absorption rate of the plasma induced by a fiber laser is also different from that induced by a CO 2 laser [7,16,22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of keyhole plasma during 10 kW high power fiber laser welding

Zhang

et al. 2014

Laser Phys.

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During high power fiber laser deep penetration welding, the laser induced plasma/vapor has a great effect on the weld pool flow and keyhole stability. In this paper, experiments on 10 kW fiber laser welding of stainless steel have been carried out. A long keyhole and keyhole plasma have been observed. The distinct spectral lines of the keyhole plasma induced by the high power fiber laser were measured and used to calculate the parameters of the plasma. The pressure of the plasma was investigated experimentally. The welding images showed a clear long keyhole and uneven distribution of the keyhole plasma. The data demonstrated that, compared with the results during CO 2 laser welding, the electron temperature was lower during fiber laser welding, while the electron density remained at a similar level. The ionization degree was found to be low. The pressure of the plasma was found to be much higher than atmospheric pressure. The results revealed that the low fiber laser absorptivity of the plasma and the high atomic density of the vapor induced by the high power fiber laser were the factors that dominated the values of the plasma parameters. In particular, the high pressure plasma was ascribed to the high atomic density of the metallic vapor.

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“…New methods for visual and optical monitoring are also required to study the processes of formation of a cloud of nanoparticles. One of those methods is the visualization with the use of brightness amplifiers -laser projection microscopes and laser monitors [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…As it has been already mentioned in a number of previous works, the visualization of fast processes blocked by the broadband background radiation is possible with the use of systems with brightness amplifiers based on metal vapors [2][3][4] and their halides [5,6]. The use of such systems -laser monitors -allows to perform high speed video recording of processes, while the time resolution is specified by a video recorder and a brightness amplifier.…”

Section: Introductionmentioning

confidence: 99%

Brightness amplifiers with PRF up to 100 kHz

Trigub

Shiyanov

Vlasov

2014

2014 15th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM)

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In this paper the design of high speed brightness amplifiers on transitions of copper and manganese atoms is discussed. A possibility of obtaining images in active optical systems with a brightness amplifier operating at 100 kHz frequency is demonstrated. The results of comparing the images obtained using brightness amplifiers on copper bromide and manganese bromide vapors are given.Index terms -Laser projection microscope, CVL, high-speed imaging, high pulse repetition rate.

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Specific features of the welding of metals by radiation of high-power fiber laser

Cited by 37 publications

References 15 publications

From a metal vapor laser projection microscope to a laser monitor (by the 50 year-anniversary of metal vapor lasers)

From a metal vapor laser projection microscope to a laser monitor (by the 50 year-anniversary of metal vapor lasers)

Investigation of keyhole plasma during 10 kW high power fiber laser welding

Brightness amplifiers with PRF up to 100 kHz

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