Friction Stir Welding (FSW) Seminar Report and PPT

Friction Stir Welding (FSW) is a solid-state joining process that creates extremely high-quality, high-strength joints with low distortion. A non-consumable spinning tool bit is inserted into a workpiece. The rotation of the tool creates the friction that heats the material to a plastic state. As the tool traverses the weld joint, it extrudes material in a distinctive flow pattern and forges the material in its wake. The resulting solid phase bond joins the two pieces into one.

The process uses no outside (filler) material, no shielding gases, and requires low energy input when compared to other welding processes. The solid phase bond between the two pieces is made solely of parent material. The grain structure in the weld zone is finer than that of the parent material and has similar strength, bending, and fatigue characteristics.

FSW: Advantages and Disadvantages

Advantages 

• excellent repeatability
• single-layer" welding of plates or profile walls (up to 25 mm!), preferably aluminum alloys,
• low thermal load,
• low distortion and low natural voltages
• weldable for special alloys (air and space travel)
• low tool cost
• no consumables
• few weld variables
• low heat distortion
• improved mechanical properties
• no fumes

Disadvantages

• not for higher-strength materials
• support necessary (backing, transverse forces)
• weld end crater
• high investment
• extensive clamping
• need backing support
• critical tolerances

Download Friction Stir Welding (FSW) Seminar Report and PPT