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Friction stir welding is a solid-state joining process that uses a non-consumable tool to join two adjacent workpiece surfaces without melting the two workpiece materials. Because there is no need to use filler materials, only the friction heat of the stirring pin is used to soften the aluminum surface and form a welded joint, which can avoid the cost and quality problems caused by filler materials.
Friction stir welding has a small heat-affected zone during the welding process, and almost no thermal deformation occurs. It is a fast welding process that can greatly improve production efficiency and save energy.