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Journal of Applied Mechanics and Technical Physics

2015 year, number 4

Mechanical Characteristics of High-Quality Laser Cutting of Steel by Fiber and CO2 Lasers

V. M. Fomin, A. A. Golyshev, A. G. Malikov, A. M. Orishich, V. B. Shulyat'ev
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: лазерная резка, СО2-лазер, волоконный лазер, критерии качества реза, скорость резки, laser cutting, CO2 laser, fiber laser, cut quality criterion, cutting velocity

Abstract

The quality of cutting of low-carbon and stainless steel by beams of fiber and CO2 lasers with oxygen or nitrogen being used as a process gas is compared. The cut surface roughness for sheets from 3 to 10 mm thick is determined. Domains of optimal (in terms of the minimum roughness criterion) application of lasers of various types in the space of dimensionless parameters (Peclet number and dimensionless power) are found. It is demonstrated that the CO2 laser is more effective for laser-oxygen cutting, while the fiber laser is more beneficial for cutting with the use of a neutral gas.