Abstract

The Effect of Selected Technological Parameters of Laser Cutting on the Cut Surface Roughness

Highlights

  • Experimental investigations were performed on samples made of the S235JR steel, with application of different laser cutting technological parameters, while observing the surface roughness Rz and Ra

  • Laser cutting of metallic materials is done by the focused laser beam impact on the cut material

  • The changes of values within the interval from 3 mm, to −3 mm; the beam diameter gradually reduces along the material, and its focus point is situated at 1 mm below the bottom edge of the cut material

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Summary

INTRODUCTION

Laser cutting of metallic materials is done by the focused laser beam impact on the cut material. Based on the above effect, it is possible to obtain a higher speed of structural steel cutting than in fusion cutting This property can, in turn, in continuous operation, lead to deterioration of the cutting process quality due to the cutting gap width, depth of the cutting surface roughening and heat affected zone. The structural applications of the S235 JR steel include freight cars, dump trucks, cranes and transmission towers, trailers, bulldozers and excavators, forestry machines, railway wagons, pipes, highway bridges, building structures, oil and gas platforms and offshore structures, fans, pumps, lifting equipment, etc Laser cutting of these steel elements is a widely applied form of material processing [21]. For these experiments, the test samples were made by using the TruLaserL3030 laser-cutting machine (by TRUMPF). The S235JR steel's chemical composition is shown in Tab. 1. [10, 11]

The Position of the Laser Beam Focus Point
The Cutting Speed
RESULTS AND DISCUSSION
Effect of the Cutting Speed on the Cut Surface Roughness
Effect of the Assist Gas Pressure on the Cut Surface Roughness
CONCLUSIONS
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