Masters Theses

Keywords and Phrases

Aerospace; Aluminum; Friction; Fusion; Stir; Welding


"Friction stir welding and processing can provide for joints in aerospace grade aluminum alloys that have preferable material properties as compared to fusion welding techniques. Aerospace grade aluminum alloys such as AA2024-T3 and AA7075-T6 are considered non-weldable by traditional fusion welding techniques. Improved mechanical properties over previously used techniques are usually preferable for aerospace applications. Therefore, by combining traditional fusion welding and friction stir processing techniques, it could be plausible to create more difficult geometries in manufactured parts instead of using traditional techniques. While this combination of fusion welding and friction stir processing is not a new technology, its introduction to aerospace grade aluminum alloys as well as non-weldable alloys, is new. This is brought about by a lowered required clamping force required by adding a fusion weld before a friction stir processing technique. The changes in properties associated with joining techniques include: microstructural changes, changes in hardness, tensile strength, and corrosion resistance. This thesis illustrates these changes for the non-weldable AA2024-T351 and AA7075-T651 as well as the weldable alloy AA5052-H32. The microhardness, tensile strength and corrosion resistance of the four processing states: base material, fusion welded material, friction stir welded material, and friction stir processed fusion welded material is studied. The plausibility of this hybrid process for the three different materials is characterized, as well as plausible applications for this joining technique"--Abstract, page iii.


Liou, Frank W.

Committee Member(s)

Newkirk, Joseph William
Kinzel, Edward C.


Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2016


xviii, 168 pages

Note about bibliography

Includes bibliographical references (pages 165-167).


© 2016 Megan Alexandra Gegesky, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Friction stir welding
Aluminum -- Welding
Manufacturing processes -- Testing

Thesis Number

T 10954

Electronic OCLC #