08 May,2025
Friction stir welding
Friction stir welding refers to the use of the heat generated by the friction between the high-speed rotating welding tool and the workpiece to partially melt the material to be welded. When the welding tool moves forward along the welding interface, the plasticized material flows from the front to the back of the welding tool under the action of the rotating friction force of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool.
During the welding process, the stirring needle extends into the joint of the workpiece while rotating. The friction heat between the rotating stirring head (mainly the shoulder) and the workpiece causes the material in front of the welding head to undergo strong plastic deformation. Then, as the welding head moves, the highly plastically deformed material gradually deposits behind the stirring head.The stirring head is usually made of tool steel, and the length of the welding head is usually slightly shorter than the required welding depth.
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