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Science and Technology of Welding and Joining Volume 24, 2019 - Issue 3
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Research Articles

Projection friction stir spot welding: a pathway to produce strong keyhole-free welds

S. M. MousavizadeDepartment of Materials Science and Engineering, Faculty of Engineering, University of Gonabad, Gonabad, IranCorrespondence[email protected] [email protected]
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M. PouranvariDepartment of Materials Science and Engineering, Sharif University of Technology, Tehran, IranORCID Iconhttp://orcid.org/0000-0002-9603-447X
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Pages 256-262 | Received 21 Jul 2018, Accepted 04 Sep 2018, Published online: 17 Sep 2018
 
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ABSTRACT

This paper introduces a novel facile method, called projection friction stir spot welding, to produce a keyhole-free friction stir welds based on a pinless tool method involving using a specially designed projection on the surface of the backing anvil. The projection plays two key roles contributing to the bonding mechanism and the joint strength: (i) encouraging the material flow perpendicular to the joint interface and (ii) bending the joint interface at the edge of the projection. The process enables pathway to produce keyhole-free welds with superior mechanical performance in steel sheets compared to the other spot welding techniques.

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