INFLUENCE OF POST-WELDING HEAT TREATMENT ON MECHANICAL AND MICROSTRUCTURAL BEHAVIOR OF FRICTION STIR WELDED AA7075-T651 AND AA6061 DISSIMILAR JOINTS

Kunnathur Periyasamy Yuvaraj; P. Ashoka  Varthanan; K. P.  Boopathiraja

doi:10.1615/HighTempMatProc.2018026422

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

Chefredakteurs: Valiantsin M. Astashynski (open in a new tab) Andrey V. Gusarov (open in a new tab)

Mitherausgeber: Nikolai N. Cherenda (open in a new tab)

Erscheint 4 Ausgaben pro Jahr

ISSN Druckformat: 1093-3611

ISSN Online: 1940-4360

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INFLUENCE OF POST-WELDING HEAT TREATMENT ON MECHANICAL AND MICROSTRUCTURAL BEHAVIOR OF FRICTION STIR WELDED AA7075-T651 AND AA6061 DISSIMILAR JOINTS

Volumen 22, Ausgabe 1, 2018, pp. 17-34

DOI: 10.1615/HighTempMatProc.2018026422

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Kunnathur Periyasamy Yuvaraj
Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore, Tamil Nadu 641008, India

P. Ashoka Varthanan
Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore, Tamil Nadu 641008, India

K. P. Boopathiraja
Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore, Tamil Nadu 641008, India

ABSTRAKT

In this investigation, impact of post-welding heat treatment on the mechanical and microstructural behavior of friction stir welded AA7075-T651 and AA6061 dissimilar joints was investigated. Post-welding heat treatment can be done by the artificial aging method at two different temperatures, 120°C and 160°C, along with three different holding times of 5 h, 10 h, and 15 h. The welded joint exposed to PWHT temperature of 120°C with 15-h holding time is found to be effective in maximizing the tensile strength of a joint about 286 N/mm² with a joint efficiency of 64.8% and hardness of 141 HV. The welded joint after post-welding heat treatment at 120°C with 15-h holding time withstands the maximum bending load of 3.85 kN along with 40-mm displacement.

SCHLÜSSELWÖRTER: friction stir welding, post-welding heat treatment, tensile strength, hardness, bend test

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