Dissimilar Joining of Stainless Steel and 5083 Aluminum Alloy Sheets by Gas Tungsten Arc Welding-Brazing Process

The dissimilar joining using gas tungsten arc welding - brazing of 304 stainless steel to 5083 Al alloy had been conducted with the addition of Al-Cu eutectic filler metal. The interface microstructure formation between filler metal and substrates, and spreading of the filler metal were studied. The...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-03, Vol.330 (1), p.12048, Article 012048
Main Authors: Cheepu, Muralimohan, Srinivas, B., Abhishek, Nalluri, Ramachandraiah, T., Karna, Sivaji, Venkateswarlu, D., Alapati, Suresh, Che, Woo Seong
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Arc brazing
Brazing alloys
Copper
Crack initiation
Dissimilar material joining
Filler metals
Gas tungsten arc welding
Heat affected zone
Interfaces
Intermetallic compounds
Mechanical properties
Metal sheets
Microhardness
Microstructure
Stainless steel
Stainless steels
Substrates
Tensile strength
Welded joints
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Summary:The dissimilar joining using gas tungsten arc welding - brazing of 304 stainless steel to 5083 Al alloy had been conducted with the addition of Al-Cu eutectic filler metal. The interface microstructure formation between filler metal and substrates, and spreading of the filler metal were studied. The interface microstructure between filler metal and aluminum alloy characterized that the formation of pores and elongated grains with the initiation of micro cracks. The spreading of the liquid braze filler on stainless steel side packed the edges and appeared as convex shape, whereas a concave shape has been formed on aluminum side. The major compounds formed at the fusion zone interface were determined by using X-ray diffraction techniques and energy-dispersive X-ray spectroscopy analysis. The micro hardness at the weld interfaces found to be higher than the substrates owing to the presence of Fe2Al5 and CuAl2 intermetallic compounds. The maximum tensile strength of the weld joints was about 95 MPa, and the tensile fracture occurred at heat affected zone on weak material of the aluminum side and/or at stainless steel/weld seam interface along intermetallic layer. The interface formation and its effect on mechanical properties of the welds during gas tungsten arc welding-brazing has been discussed.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/330/1/012048