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Advances in Materials Science and Engineering
Volume 2016, Article ID 1242565, 8 pages
Research Article

High-Power Laser Cutting of Steel Plates: Heat Affected Zone Analysis

1Department of Mechanical Engineering, College of Engineering, Aljouf University, Sakaka 2014, Saudi Arabia
2College of Sciences, Research Unit MEER, University of Gafsa, 2100 Gafsa, Tunisia
3Department of Industrial Engineering, College of Engineering, Hail University, Hail, Saudi Arabia

Received 19 November 2015; Revised 7 February 2016; Accepted 11 February 2016

Academic Editor: Anna Richelli

Copyright © 2016 Imed Miraoui et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The thermal effect of CO2 high-power laser cutting on cut surface of steel plates is investigated. The effect of the input laser cutting parameters on the melted zone depth (MZ), the heat affected zone depth (HAZ), and the microhardness beneath the cut surface is analyzed. A mathematical model is developed to relate the output process parameters to the input laser cutting parameters. Three input process parameters such as laser beam diameter, cutting speed, and laser power are investigated. Mathematical models for the melted zone and the heat affected zone depth are developed by using design of experiment approach (DOE). The results indicate that the input laser cutting parameters have major effect on melted zone, heat affected zone, and microhardness beneath cut surface. The MZ depth, the HAZ depth, and the microhardness beneath cut surface increase as laser power increases, but they decrease with increasing cutting speed. Laser beam diameter has a negligible effect on HAZ depth but it has a remarkable effect on MZ depth and HAZ microhardness. The melted zone depth and the heat affected zone depth can be reduced by increasing laser cutting speed and decreasing laser power and laser beam diameter.