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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360

Выпуски:
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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v4.i2.40
14 pages

The Effect of Process Speed on Energy Redistribution in Deep Penetration CO2 Laser Welding

C. Lampa
The Swedish Institute of Production Engineering Research, Argongatan 30, SE-43153 Molndal, Sweden
A.F.H. Kaplan
Department of Non-Conventional Processing, Forming and Laser Technology, Vienna University of Technology, Arsenal Objekt 207, A-1030 Vienna, Austria
J. Powell
Laser Expertise Ltd., Harrimans Lane, Dunkirk, Nottingham NG7 2TR, UK; and Division of Materials Processing, Lulea University of Technology, SE-97187 Lulea, Sweden
C. Magnusson
Division of Materials Processing, Lulea University of Technology, SE-97187Lulea, Sweden

Краткое описание

This work discusses energy absorption mechanisms in CO2 laser welding and how they are affected by changes in the process speed. Two main energy absorption processes govern the welding interaction:

  1. Fresnel absorption at the keyhole walls.
  2. Absorption by the partially ionised metal vapour (or plasma) in the keyhole (laser energy absorbed in this way is re-radiated or conducted to the keyhole walls).
A theoretical model of these absorption mechanisms has been developed and shown to agree closely with experimental results. Fresnel absorption has been identified as being dominant over plasma absorption and becomes even more influential as welding speeds are increased.


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