Can we make the milling operation without making dissasembly of the head?

Yes, it is possible to switch from welding to machining and back again without disassembling the FSW head.
The Stirweld welding head was designed by experts in FSW and machining. This hybrid system allows welding and machining to take place in succession. Simply replace the FSW tool with a milling cutter. The milling add-on allows friction stir welding and simple machining or finishing of parts to be carried out easily on the same machine without human intervention.