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Research Papers

Cold Metal Transfer Welding of AA6061 to AA7075: Mechanical Properties and Corrosion

[+] Author and Article Information
Nilay Çömez

Engineering Faculty,
Department of Metallurgical and Materials Engineering,
Manisa Celal Bayar University,
45140 Manisa, Turkey
e-mail: nilay.comez@cbu.edu.tr

Hülya Durmuş

Engineering Faculty,
Department of Metallurgical and Materials Engineering,
Manisa Celal Bayar University,
45140 Manisa, Turkey
e-mail: hulya.durmus@cbu.edu.tr

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received December 8, 2017; final manuscript received February 6, 2019; published online March 11, 2019. Assoc. Editor: Khaled Morsi.

J. Eng. Mater. Technol 141(3), 031002 (Mar 11, 2019) (6 pages) Paper No: MATS-17-1367; doi: 10.1115/1.4042863 History: Received December 08, 2017; Accepted February 06, 2019

Cold metal transfer (CMT) welding provides many advantages for welding of dissimilar materials and thin sheets with its superior heat input control mechanism. In this study, AA6061 and AA7075 aluminum alloys were joined with CMT welding. The effect of welding parameters on hardness, tensile strength, and corrosion rate was investigated. The Tafel extrapolation method was carried out to determine the corrosion rates of AA6061 and AA7075 base metals and AA6061–AA7075 joints. Increasing heat input was found to be detrimental for both mechanical properties and corrosion resistance. The outcomes showed that CMT welding produces adequate joints of AA6061–AA7075 in terms of mechanical properties and corrosion resistance, favorably with welding parameters that provide low heat input.

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Figures

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Fig. 1

Microstructures of the weld metal: (a) 67-L and (b) 67-H. The proportion of porosity in the weld metal (pores in dark): (c) 67-L and (d) 67-H.

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Fig. 2

AA6061/weld metal interface: (a) 67-L, (b) 67-M, (c) 67-H, and (d) AA6061 base metal

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Fig. 3

AA7075/weld metal interface: (a) 67-L and (b) 67-M

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Fig. 4

Hardness distribution of welded samples

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Fig. 5

(a) Stress–strain curves of AA6061–AA7075 CMT-welded specimens, (b) Heat input–tensile strength relationship, (c) Ruptured samples after tensile testing, and (d) Fracture surface of 67-L

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Fig. 6

Tafel curves of AA6061–AA7075 joints

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Fig. 7

Correlation between the heat input and the corrosion rate

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Fig. 8

Corroded surface of 67-M: (a) AA6061 base metal, (b) weld metal, and (c) EDX analyses from AA6061 base metal

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Fig. 9

EDX analyses of 67-L after corrosion (1: AA7075; 2: intermetallic particle; 3: interdendritic phase)

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Fig. 10

Intergranular corrosion: (a) 67-H and (b) 67-M. Corrosion in weld metal: (c) 67-L and (d) 67-H.

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