Explain a main advantage of Friction Stir Welding over Fusion Welding in regards to grain structure.
Friction Stir Welding does not require temperatures where the metallurgical properties are changed in the base metal, but strength, ductility and corrosion resistance may all be affected but there are no changes to the grain structure in HAZ.
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What is in the thermomechanically affected zone?
All of the plastically deformed material in the joint, in this region plastic deformation of the original grain structure occurs.
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How can the elimination of severe heat effect the joint?
It will have improved appearance on the underside.
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What is a major limitation of Friction Stir Welding?
The material must be ductile.
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Explain a design limitation.
It is impossible to create a fillet weld as there is no additional weld material added during the welding process.
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Why can Friction Stir Welding be chosen as a technique to weld aluminium together when other techniques have deemed the aluminium grades unweldable?
The level of impurities and defects is reduced dramatically as the aluminium never becomes truly molten.
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Describe two uses of Friction Stir Welding with Aluminium.
Commonly used to join ship's plates together, but close regulation making it a workshop technique, also now starting to replace riveting in the construction of aircraft.
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Name materials in which is Friction Stir Welding can be used on.
Aluminium, Titanium, Lead, Magnesium, Zinc, Copper, some Steels
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Other cards in this set
Card 2
Front
What is in the thermomechanically affected zone?
Back
All of the plastically deformed material in the joint, in this region plastic deformation of the original grain structure occurs.
Card 3
Front
How can the elimination of severe heat effect the joint?
Back
Card 4
Front
What is a major limitation of Friction Stir Welding?
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