METHOD FOR PRELIMINARY ESTIMATION OF THE CRITICAL POWER DENSITY IN LASER TECHNOLOGICAL PROCESSES

Lyubomir Lazov; Nikolay Angelov; Edmunds Teirumnieks

METHOD FOR PRELIMINARY ESTIMATION OF THE CRITICAL POWER DENSITY IN LASER TECHNOLOGICAL PROCESSES

Lyubomir Lazov, Nikolay Angelov, Edmunds Teirumnieks

Last modified: 29.04.2019

Abstract

For a number of new laser technology processes, it is essential to plan an experimental plan for primary experimental engineering activities in terms of quality. The assessment of the critical power density to reach the melting or evaporation temperature of the surface with a suitable theoretical model is an important stage in the development of a particular manufacturing technology. With the help of numerical experiments, this report provides a method for pre-examining the influence of wavelength on the laser technological process. The calculations are performed with a specialized program, running MATLAB. A series of temperature fields were obtained at a change in power density and wavelength at laser impact for concrete types of structural steel. The temperature dependence of the optical and thermo-physical characteristics of the material is also reporded. The analysis is made for laser technology complexes working with lasers emitting in the ultraviolet, visible, near and distant infrared areas. For these wavelengths the critical power density of melting and evaporation is determined.

Keywords

laser processing of materials; numerical experiments; temperature fields; structural steel; wavelength; power density

References

[1] Sobotova, L., Demec P. (2015), Laser Marking of Metal Materials, Modern Machinery Science Journal, December 2015, 808-812

[2] Valiulin A., Gorniy S., Grechco Y., Patrov M., Yudin K., Yurevich V. Lazerna markirovka materialov. Nauchno-technicheskij zhurnal Fotonika, 2007, 3, pp 16-22 (in Russian)

[3] Angelov N. Optimizacija na procesa markirane s lazerno lychenie na obrazci ot instrumentalna stomana. Disertacionen trud za pridobivane na stepen doktor. TU-Gabrovo, 2011 (in Bulgarian)

[4] Pauli, G., The Method behind the Mark, Small Arms Survey, Number 1, December 2010

[5] Jianmei Li, Aiqun Wang, Yusong Wuab, ZhuoMa, Xinxin Fang, LiangTao, Experimental investigation and mathematical modeling of laser marking two-dimensional barcodes on surfaces of aluminum alloy, Journal of Manufacturing Processes, Volume 21, January 2016, pp 141-152

[6] Qi, J., K. Wang, Y. Zhu (2003), A study on the laser marking process of stainless steel, Journal of Materials Processing Technology, 2003, 20 August, Volume 139, Issues 1-3, 273-276

[7] Senthilkumar, V., Laser cutting process – A Review International Journal of Darshan Institute on Engineering Research & Emerging Technologies, Vol. 3, No. 1, 2014

[8] Blecher, J., T. Palmer, T. Debroy, Mitigation of Root Defect in Laser and Hybrid Laser-Arc Welding, Welding Journal, 94(3),73-82, March 2015

[9] www.splav-kharkov.com/main.php

[10] Belev I. Sreda za presmyatane na lazerno inducirani temperaturni poleta. Diplomna rabota, TU-Gabrovo, 2009 (in Bulgarian)

[11] www.pulsligth.net

[12] www.axsys.de

[13] www.spilasers.com

ENVIRONMENT. TECHNOLOGY. RESOURCES 15th International Scientific and Practical Conference. June 27-28, 2024, ''Vasil Levski'' National Military University, Veliko Tarnovo, Bulgaria