Azides and nitrides in joints welded by laser using N2 as covering gas

Giuseppe Daurelio; G. Dionoro; F. Memola Capece Minutolo; Christos N. Panagopoulos

doi:10.1117/12.144576

4 May 1993 Azides and nitrides in joints welded by laser using N2 as covering gas

Giuseppe Daurelio, G. Dionoro, F. Memola Capece Minutolo, Christos N. Panagopoulos

Proceedings Volume 1810, 9th International Symposium on Gas Flow and Chemical Lasers; (1993) https://doi.org/10.1117/12.144576
Event: Ninth International Symposium on Gas Flow and Chemical Lasers, 1992, Heraklion, Greece

Abstract

A large amount of metals and alloys are successfully penetration welded by pulsed or cw laser. The laser welding process requires a gas flow (covering gas) to ensure adequate protection of the melt against atmospheric oxidation. The gas can be supplied in a variety of ways but in many cases the coaxial gas-laser geometry is used. This work is concerned with technological and structural investigations (using SEM and A.E.S. microanalysis) aimed at identifying any particular differences in the welds obtained using N₂ instead of He as the covering gas. The investigations conducted on INCONEL 600 and stainless steel appear to provide conclusive evidence that N₂ may be readily used as an alternative to He. Very recent works have studied some peculiarities (blanketing, transmission, and process efficiency) of N₂ as a covering gas, when used in 2 kW CO₂ laser welding. The influence of the covering gas in welding two stainless steels (AISI 304 and 430) and of a nickel alloy (INCONEL 600) using a 2 kW CO₂ laser is examined.

Citation Download Citation

Giuseppe Daurelio, G. Dionoro, F. Memola Capece Minutolo, and Christos N. Panagopoulos "Azides and nitrides in joints welded by laser using N2 as covering gas", Proc. SPIE 1810, 9th International Symposium on Gas Flow and Chemical Lasers, (4 May 1993); https://doi.org/10.1117/12.144576

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