Friction stir welding
In 1996, Hydro was the first company in the world to develop industrial-scale production using friction stir welding (FSW) as the joining method. Today, we are a world leader in the industrial use of FSW and can offer customers aluminum panels that are up to 18 meters long and 3.5 meters wide.
Some benefits of friction stir welding
- A simple process that provides completely pore-free, leak-free, dense joints with high strength
- Minimal heat impact on the material. Only small thermal stresses in the product
- Good mechanical properties. Production has few, easily controllable variables that allow for tight tolerances
- Extremely good repeatability and perfect for automation
Friction stir welding is a method that enables welding of components with high demands for compressive strength and tightness. The method makes it possible to produce wide panels, such as roofs or sides of trains, which are difficult or impossible to extrude. The technology is also superior in terms of getting leak-free joints when sealing different kinds of aluminum compartments, such as in liquid heat sinks.
The workpieces are joined in a solid state. With FSW, a rotating tool creates pressure and frictional heat on the joint surfaces so that the metal mixes and forms a joint of the best quality. The temperature of the material closest to the joint reaches a maximum of 500 ° C for fractions of a second, after which it cools rapidly. The controlled temperature means that the melting point is not exceeded, as opposed to conventional fusion welding.
FSW also improves the working environment, compared with traditional forms of welding, as welding glare, smoke and ozone formation are completely eliminated. Steel brushing, grinding and intermediate string cleaning are not required.
The FSW method has been shown to create joints with high strength values and no inclusions or contaminants. Tensile tests have shown that the welds are almost completely stress-free. Det Norske Veritas has approved the FSW process for demanding train and marine applications.
Friction stir welding
Learn more about friction stir welding (FSW). This paper describes the process and equipment, some user applications, the benefits of FSW and how it compares to fusion welding.Download white paper