Vol.8, No2, 2008, pp. 114-120
 UDC 621.791.05:669.715'721'74

POROSITY OF WELDED JOINTS OF AlMg4.5Mn ALLOY

Sandra Kastelec-Macura 1

Radica Prokić-Cvetković, Olivera Popović 2

Radomir Jovičić 3

Meri Burzić 4

1 Tehnikum taurunum-VIŠSS, Belgrade

2 Faculty of Mechanical Engineering, University of Belgrade

3 Innovation Centre of the Faculty of Mechanical Engineering, University of Belgrade

4 GOŠA Institute, Belgrade

Abstract

Porosity represents a serious problem of welded joints of Al alloys, since it significantly reduces their applicability for producing light structures. In order to reduce porosity, welded joints of AlMg4.5Mn alloy have been tested and how the weld metal porosity is influenced by the shielding gas composition in the applied TIG process is also determined by microstructural analysis. Based on this analysis, the performed welded joint is quality assessed. Shielding gases Ar, He and N2 were used, individually, or in mixtures. Highest porosity is achieved with pure argon, and the best results with a mixture Ar + 50%He + 0.015%N2.

Keywords: AlMg4.5Mn alloy, porosity, shielding atmosphere, TIG welding

full article (1.44 MB)