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Proceedings Paper

The Influence And Role Of Helium And Nitrogen As Shielding Gases In 2KW CO2 Laser Welding Of Austenitic Stainless Steels : Physical, Geometrical And Technological Characterization
Author(s): G. Daurelio; A. Ludovico; A. Saponaro
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Paper Abstract

Laser welding processes require nozzles with a " large " outlet in order both to avoid turbulent gas flow which can cause removal of the melt and to ensure an adequate protection of the melt against atmospheric oxidation. The gas can be supplied in a variety of ways but in this work the coaxial gas-laser beam geometry was used. CO2, He and N2 have been tested as covering gases with flows between 30+100 Nl/min. It has been observed that, once the gas and the steel have been set, the penetration depth and the width of the melted zone are, in the majority of cases, virtually constant when the flow rate increases from 30 to 100 Nl/min.

Paper Details

Date Published: 20 June 1989
PDF: 17 pages
Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); doi: 10.1117/12.950581
Show Author Affiliations
G. Daurelio, Material Processing Senior Researcher (Italy)
A. Ludovico, Department of Industrial Design and Production (Italy)
A. Saponaro, Department of Industrial Design and Production (Italy)

Published in SPIE Proceedings Vol. 1031:
7th Intl Symp on Gas Flow and Chemical Lasers

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