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Title: Microstructure evolution of Al/Mg butt joints welded by gas tungsten arc with Zn filler metal

Abstract

Based on the idea of alloying welding seam, Gas tungsten arc welding method with pure Zn filler metal was chosen to join Mg alloy and Al alloy. The microstructures, phases, element distribution and fracture morphology of welding seams were examined. The results indicate that there was a transitional zone in the width of 80-100 {mu}m between the Mg alloy substrate and fusion zone. The fusion zone was mainly composed of MgZn{sub 2}, Zn-based solid solution and Al-based solid solution. The welding seam presented distinct morphology in different location owning to the quite high cooling rate of the molten pool. The addition of Zn metal could prevent the formation of Mg-Al intermetallics and form the alloyed welding seam during welding. Therefore, the tensile strengths of joints have been significantly improved compared with those of gas tungsten arc welded joints without Zn metal added. Highlights: Black-Right-Pointing-Pointer Mg alloy AZ31B and Al alloy 6061 are welded successfully. Black-Right-Pointing-Pointer Zinc wire is employed as a filler metal to form the alloyed welding seam. Black-Right-Pointing-Pointer An alloyed welding seam is benefit for improving of the joint tensile strength.

Authors:
;
Publication Date:
OSTI Identifier:
22066472
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 69; Journal Issue: Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; FILLER METALS; FRACTURES; GAS TUNGSTEN-ARC WELDING; INTERMETALLIC COMPOUNDS; MAGNESIUM BASE ALLOYS; MICROSTRUCTURE; MORPHOLOGY; SOLID SOLUTIONS; SUBSTRATES; TENSILE PROPERTIES; TUNGSTEN; WELDED JOINTS; ZINC

Citation Formats

Fei, Liu, Zhaodong, Zhang, and Liu Liming, E-mail: liulm@dlut.edu.cn. Microstructure evolution of Al/Mg butt joints welded by gas tungsten arc with Zn filler metal. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.04.012.
Fei, Liu, Zhaodong, Zhang, & Liu Liming, E-mail: liulm@dlut.edu.cn. Microstructure evolution of Al/Mg butt joints welded by gas tungsten arc with Zn filler metal. United States. doi:10.1016/J.MATCHAR.2012.04.012.
Fei, Liu, Zhaodong, Zhang, and Liu Liming, E-mail: liulm@dlut.edu.cn. Sun . "Microstructure evolution of Al/Mg butt joints welded by gas tungsten arc with Zn filler metal". United States. doi:10.1016/J.MATCHAR.2012.04.012.
@article{osti_22066472,
title = {Microstructure evolution of Al/Mg butt joints welded by gas tungsten arc with Zn filler metal},
author = {Fei, Liu and Zhaodong, Zhang and Liu Liming, E-mail: liulm@dlut.edu.cn},
abstractNote = {Based on the idea of alloying welding seam, Gas tungsten arc welding method with pure Zn filler metal was chosen to join Mg alloy and Al alloy. The microstructures, phases, element distribution and fracture morphology of welding seams were examined. The results indicate that there was a transitional zone in the width of 80-100 {mu}m between the Mg alloy substrate and fusion zone. The fusion zone was mainly composed of MgZn{sub 2}, Zn-based solid solution and Al-based solid solution. The welding seam presented distinct morphology in different location owning to the quite high cooling rate of the molten pool. The addition of Zn metal could prevent the formation of Mg-Al intermetallics and form the alloyed welding seam during welding. Therefore, the tensile strengths of joints have been significantly improved compared with those of gas tungsten arc welded joints without Zn metal added. Highlights: Black-Right-Pointing-Pointer Mg alloy AZ31B and Al alloy 6061 are welded successfully. Black-Right-Pointing-Pointer Zinc wire is employed as a filler metal to form the alloyed welding seam. Black-Right-Pointing-Pointer An alloyed welding seam is benefit for improving of the joint tensile strength.},
doi = {10.1016/J.MATCHAR.2012.04.012},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 69,
place = {United States},
year = {2012},
month = {7}
}