Friction Stir Welding (FSW) is a versatile process, suitable for many metals and metal alloys, including aluminum, magnesium, copper, brass, stainless steel, and titanium. It can also be used to join dissimilar metals that would otherwise not be weldable using traditional methods. It is important to note that the material being welded must be of good quality and free from contamination in order for FSW to be successful.