Effect of Coating on Mechanical Properties of Magnesium Alloy Friction Stir Spot Welds

Abstract

Magnesium alloy AZ31 sheets with a 25 μm coating layer were friction stir spot welded. Compared to bare AZ31 sheets, the coated material exhibited lower tool plunge force for similar process parameters. Lap-shear tests indicated a much lower separation load for the coated AZ31 spot welds. the coated specimens separated in a nugget pull-out mode as a result of bottom-sheet cracking in the thermomechanically affected zone adjacent to the nugget. the initial crack started from the lower surface of the bottom sheet and appeared to be dependent on thermal stress and strain gradient. the length of the crack varied as the tool rotation rate changed, and the crack moved away from the weld center as nugget size increased.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Bottom-sheet cracking; Coated AZ31; Friction stir spot welding; Separation modes

International Standard Book Number (ISBN)

978-111800201-8

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Wiley, All rights reserved.

Publication Date

01 Jan 2011

Link to Full Text

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