FRICTION WELDING MACHINE

PURPOSE:To suppress the generation of an intermetallic compound and to execute a stable junction in strength by providing a cooling system for injecting a fluid so that a joined metal can be cooled, in the vicinity of a chuck part of a rotary side or a still side. CONSTITUTION:The chuck 1 of the rotary side is driven by a motor 4 in a state that one work is grasped. Subsequently, the work 3 of the staill side is moved to the work 2 of the rotary side by a hydraulic device 5, and before two works come into contact with each other, first of all, a clutch 6 is detached, and from immediately after the contact is started, the speed of revolution of the rotary side goes down by friction. During this time, the temperature of the joint surface rises, and at the time when the speed of revolution goes down to a prescribed value, a clutch 7 is detached generally in order to prevent a flywheel 8 from stopping completely due to a junction. Simultaneously, a cooling liquid is injected from a nozzle 11 arranged in the chuck 1 side. In such a manner, the heated work is cooled suddenly, and a stable joining state is obtained.