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Journal of Undergraduate Research

Keywords

friction stir welding, FSW, HSLA steel, HSLA 65

College

Ira A. Fulton College of Engineering and Technology

Department

Mechanical Engineering

Abstract

In response to industrial need for a high-strength, weldable, malleable, and corrosion resistant steel the United States Navy developed a high-strength, low-alloy steel known as HSLA 65. Because of its superior mechanical properties and low cost, HSLA 65 is being increasingly used in pipeline, naval, and automotive industries. The important structural role it plays in these industries requires not only that it be weldable, but that, once welded, it maintain specified strength, ductility, and chemical composition values to avoid failure during extreme loading conditions. To achieve these properties, HSLA requires an efficient welding method that will not degrade its strength. Traditional fusion welding techniques used commonly for steel-joining have proven insufficient in this regard as they degrade the steel’s mechanical properties by: 1) causing dramatic phase changes in the microstructure of the existing metal, and 2) changing the metal composition at the joint by adding a filler metal.

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