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

Lyubomir Lazov, Nikolay Angelov, Edmunds Teirumnieks

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

Full Text:

PDF

References


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

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)

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)

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

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

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

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

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

www.splav-kharkov.com/main.php

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

www.pulsligth.net

www.axsys.de

www.spilasers.com




DOI: http://dx.doi.org/10.17770/etr2019vol3.4140

Refbacks

  • There are currently no refbacks.