Dynamic Phenomena in Laser Processing - The Generation of the Surface Heat-Spot in the Sheet High-Speed Cutting with the Fiber Laser and Change of the Heating Domain

Takeji Arai

doi:10.4028/www.scientific.net/DDF.370.52

Paper Titles

An Analytical Framework for the Study of Solid Body Cooling
p.1

Experiments on Dissimilar Valve Lift (DVL) for Turbulence Increment on a Bi-Fuel Compressed Natural Gas (CNG) Engine
p.19

Effects of Longitudinal Alignments on the Time-Mean Flow Structures of Side-by-Side Circular Cylinders of Diameter Ratio Two
p.29

Optimized Pressure Determined in Accordance with Variable Plunger Stroke of Internal Injector NGV
p.41

Dynamic Phenomena in Laser Processing - The Generation of the Surface Heat-Spot in the Sheet High-Speed Cutting with the Fiber Laser and Change of the Heating Domain
p.52

Measuring the Thermal Characteristics of Concretes Exposed to Extreme Conditions
p.68

Analysis of Physical-Mechanical and Surface Properties of Wood Plastic Composite Materials to Determine the Energy Balance
p.78

Sliding Mode Control of a Water-Displacement Based Mechanism Applied to the Orientation of a Parabolic-Trough Solar Concentrator
p.90

Analysis of the Fluid Diffusion Characteristics in Platelet Pre-Mixer
p.98

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 370Dynamic Phenomena in Laser Processing - The...

Dynamic Phenomena in Laser Processing - The Generation of the Surface Heat-Spot in the Sheet High-Speed Cutting with the Fiber Laser and Change of the Heating Domain

Abstract:

A laser beam with a fixed diameter emitted from an oscillator acts as a heat-spot (or hot-spot by the heat source) on the surface of the material that irradiates. The shape of the heat-spot on the material has been treated as constant for a long time, regardless of the speed of the material to be processed. In fact, on the surface of the material the light and the material mutually act on each other, so the shape of the heat-spot which appears on the surface many vary depending on the processing speed. In order to confirm this, an experiment was performed using infrared sensors sheet, and using a galvanized steel sheet. The experiment confirmed that the shape of the heat-spot on the material surface depends on the processing speed. The decreasing ratio of deformation with respect to the speed was determined, and it was applied to high-speed cutting processing with a fiber laser. We also studied the rate of change of the preheating-area and the removal-area in the heat-spot which is an important domain when performing high-speed cutting.

You might also be interested in these eBooks

Transfer Phenomena in Fluid and Heat Flows

View Preview

Info:

Periodical:

Defect and Diffusion Forum (Volume 370)

Pages:

52-67

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.370.52

Citation:

Cite this paper

Online since:

January 2017

Authors:

Takeji Arai

Keywords:

Change of Heat-Spot Shape, Dynamic Laser Beam Phenomena, Laser Cutting Processing, Laser Heat-Spot Behavior, Pre-Heating Area

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] W. W, Duley: CO2 Lasers Effects and Applications, Academic Press p.259 (1976).

Google Scholar

[2] E.J. Morgan-Warren: The Application of the Laser Welding to Overcome Join Asymmetry, Welding Research Supplement 76-s march (1979).

Google Scholar

[3] I. Miyamoto and H. Maruo: The mechanism of laser cutting, Welding in the world/Le Soudage dans le monade. Vol. 29, No. 9/10 pp.283-291 (1991).

Google Scholar

[4] L. Cai and P. Shen: Analysis of Laser Evaporative and Fusion Cutting. Journal of Manufacturing Science and Engineering Vol. 118/225 May (1996).

Google Scholar

[5] M.J. Kim and P. Majumdar: Computational Model for High-Energy Laser-Cutting processes, Numerical Heat Transfer, Part A, 27: 717-733, (1995).

DOI: 10.1080/10407789508913728

Google Scholar

[6] H.S. Calslaw &J.C. Jaeger,: Heat Conductions in Solids, 2nd ed, Oxford Univ, Press, p.267 (1959).

Google Scholar

[7] T, Arai: Dynamic phenomena in laser processing,. JSLT annual meeting in spring of 2016, O01 813-814 (2016. 3) ※ JSLT: The Japan Society for Precision Engineering.

Google Scholar