Metallurgical and mechanical investigations of aluminium-steel butt joint made by tungsten inert gas welding–brazing
- 1 October 2009
- journal article
- research article
- Published by SAGE Publications in Science and Technology of Welding and Joining
- Vol. 14 (7), 636-639
- https://doi.org/10.1179/136217109x12464549883493
Abstract
Dissimilar metals of 5A06 aluminium alloy and SUS321 stainless steel were butt joined by tungsten inert gas welding–brazing with BJ380A filler metal and modified non-corrosive flux. The interface in seam/steel is made up of two kinds of intermetallic phase layers, τ 5-Al7Fe2Si phase in the seam side and θ-FeAl3 phase in the steel side. The granular phase in welded seam is CuAl2, and the lath shaped phase is τ 6-Al5FeSi. In the fusion area, the chainlike phase is Al–Si eutectic structure, and the block-like phase is Al6(Fe,Mn). The tensile strength of the butt joint reaches 125 MPa, and fracture occurs at τ 5-layer, with highest hardness value of 950 HV. The present joint without coated layer can reach the same level to those with coated layer.Keywords
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