WELDING HEAD, WELDING SYSTEM, METHOD AND COMPUTER PROGRAM FOR FRICTION STIR WELDING

摘要

Welding head 1 for friction stir welding, adapted for connection and drivingof a tool 2 intended for simultaneous friction stir welding from two oppositesurfaces 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 10of the tool and relative to the object for welding arranged in conjunctionwith the welding head. The force-generating device is controllable duringoperation and adapted so as, during operation, to act between a primaryshoulder 6 and a secondary shoulder 7 on a tool 2 connected in the tool holder9. The invention also comprises a welding system for friction stir welding,with the force between the shoulders of the tool being controlled depending onthe current torque for rotary driving. Also indicated are a method forinitiating friction stir welding and computer program for such a method.