0

Full Content is available to subscribers

Subscribe/Learn More  >

Numerical Simulation of Thermohydraulic Characteristics of Dross Ejection Process in Laser Steel Cutting

[+] Author Affiliations
Kenta Sugihara, Yasuyuki Nakamura, Takemitsu Ogawa, Toshiharu Muramatsu

Japan Atomic Energy Agency, Tsuruga, Fukui, Japan

Paper No. ICONE20-POWER2012-54185, pp. 261-267; 7 pages
doi:10.1115/ICONE20-POWER2012-54185
From:
  • 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
  • Volume 4: Codes, Standards, Licensing, and Regulatory Issues; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Instrumentation and Controls; Fuels and Combustion, Materials Handling, Emissions; Advanced Energy Systems and Renewables (Wind, Solar, Geothermal); Performance Testing and Performance Test Codes
  • Anaheim, California, USA, July 30–August 3, 2012
  • Conference Sponsors: Nuclear Engineering Division, Power Division
  • ISBN: 978-0-7918-4498-4
  • Copyright © 2012 by ASME

abstract

In order to verify practical effectiveness of fiber laser cutting technology to reactor decommissioning, towards over 150 mm thickness, laser cutting experiment of thick steel plate is conducted by using 10(4+6) kW fiber laser system. As it stands now, laser cutting of over 100 mm thickness steel plate isn’t achieved. There are several possible reasons why thick steel plate can’t be cut. One of them, we consider is a difficulty of dross (molten metal) ejection to the back side of steel plate. A cutting kerf is small in width, and assist gas flow decay with increasing kerf depth. Therefore thermohydraulic interaction between assist gas and dross takes on an important role for a formation of the steel kerf. Numerical simulation code, based on multi-phase thermohydraulics, has been being developed with a goal of a control and prediction for the laser cutting process. In order to analyze the dross ejection characteristics, the code solves mass, momentum, and energy conservation equations simultaneously in a finite difference form with a series of physical models of the laser cutting process, such as heat input by laser, phase-change, and three-phase surface capturing. In this way, the laser cutting simulation code was build on the concept of multi-purpose multi-phase thermohydraulic applications. A thermohydraulic numerical simulation of the laser steel cutting was carried out to confirm an assist gas and cutting speed effect to the cutting performance. The performance was evaluated, based on temperature profile and cutting front formation. Simulation results were as follows. If there was no effect of dross ejection by assist gas, a laser light was absorbed into molten steel stagnated in the kerf. Therefore, there was less laser heat input to a solid surface directly. Then, heat transport to the back side of the steel plate got delayed. In the case of faster cutting speed, delay of heat conduction and failure cut were confirmed at behind the cut starting position of the steel plate. Failure cut at the position was observed in our experiments. From these results, it was concluded that the thermohydraulics in the kerf takes important role for not only dross ejection but also promotion of heat input at solid surface.

Copyright © 2012 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In