Metallurgical and mechanical investigations of aluminium-steel butt joint made by tungsten inert gas welding-brazing
Authors: Lin, S.B.1; Song, J.L.2; Yang, C.L.1; Ma, G.C.1
Source: Science and Technology of Welding & Joining, Volume 14, Number 7, October 2009 , pp. 636-639(4)
Publisher: Maney Publishing
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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, τ5-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 τ6-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 τ5-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: ALUMINIUM; STEEL; TIG WELDING-BRAZING; INTERMETALLIC PHASE; MECHANICAL PROPERTIES
Document Type: Research article
DOI: 10.1179/136217109X12464549883493
Affiliations: 1: State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2: State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;, Email: songjianling116@163.com
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