Projection Friction Stir Spot Welding: A New Welding Technique for Creating Safe and Reliable Aluminum Welds

Document Type: Research Paper

Authors

1 Ph.D. Candidate, Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran

2 Head of Technical Inspection & Corrosion Management Policy, Deputy Minister of Engineering, Research & Technology, Ministry of Petroleum

3 Assistant Professor, Department of Materials Science and Engineering, Faculty of Engineering, University of Gonabad, Gonabad, Iran

4 Assistant Professor, Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran

Abstract

A novel friction stir welding method called projection friction stir spot welding (PFSSW) was introduced to produce safe and reliable welds by using a pinless tool and a specially-designed projection on the surface of a backing anvil. This projection along with the tool rotation speed plays an important role in having a reliable joint with excellent mechanical properties and good surface appearance. This welding technique can be widely developed in oil and gas, as well as in automotive, aerospace, and transportation, industry. The effect of tool rotation speed (1000, 1600, 2000 rpm) on the hardness, microstructure, and mechanical properties of 2024 aluminum alloy sheets was investigated. The surface appearance of the welding zone showed that the keyhole was not formed, and the appearance of the weld was almost smooth. Fracture surfaces of the failed specimens present the interfacial fracture at the tool rotation speed of 1000 rpm and circumferential fracture at tool rotation speed of 1600 and 2000 rpm.

Highlights

  • A novel friction stir welding method called projection friction stir spot welding is introduced to produce safe and reliable welds.
  • The projection geometry along with the tool rotation speed plays an important role in having a reliable joint with excellent mechanical properties and good surface appearance.
  • This new welding technique can be a good alternative to conventional welding techniques that have major welding defects.
  • This welding technique can be widely developed in oil and gas, automotive, aerospace, and transportation industry.

Keywords

Main Subjects


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