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Technical Examples
Welding head 1 for friction stir welding, adapted for connection and driving of a tool 2 intended for simultaneous friction stir welding from two opposite surfaces on an object for welding, comprising a tool holder 9, a force-generating device 3, 13 and a rotary driving device 5 which, during operation, can impart to the connected tool 2 a cyclic movement around the centre axis 10 of the tool and relative to the object for welding arranged in conjunction with the welding head. The force-generating device is controllable during operation and adapted so as, during operation, to act between a primary shoulder 6 and a secondary shoulder 7 on a tool 2 connected in the tool holder 9. The invention also comprises a welding system for friction stir welding, with the force between the shoulders of the tool being controlled depending on the current torque for rotary driving. Also indicated are a method for initiating friction stir welding and computer program for such a method.