Hits:

Indexed by:期刊论文

Date of Publication:2008-09-01

Journal:MATERIALS CHARACTERIZATION

Included Journals:SCIE、EI、Scopus

Volume:59

Issue:9

Page Number:1279-1284

ISSN No.:1044-5803

Key Words:laser-GTA hybrid welding; magnesium alloy; steel; interface of Mg-Fe; oxide

Abstract:A laser-GTA hybrid welding technique was chosen to study the weld of the dissimilar alloys of AZ31B Mg alloy and 304 steel. A lap joint was formed between the two. The weld penetration, which determines the mechanical properties of the welded joints, depends on the laser power. A transition zone formed at the interface of the Mg-Fe during laser-GTA hybrid welding and Mg element diffused into the Fe matrix by forming oxides and reacting in the transition. During tensile testing, the joints fractured at the interface between the Mg alloy and the steel. Metallic oxides produced at the Mg-Fe interface were the reason for the poor mechanical properties of the weld joints. (C) 2007 Elsevier Inc. All rights reserved.