METHOD OF CONTROLLING MECHANICAL PARAMETER OF FRICTION WELDING

摘要

PURPOSE: To improve quality and strength of a weld joint by stopping vibration when members to be jointed are relatively vibrated and displacement of melting flow in the melting area increases continuously and rectilinearly in the course of time. CONSTITUTION: After members to be jointed are displaced by giving relative vibration till the material is melted in a contacting area, the vibration is stopped and the members are cooled and welded. In this manipulation, a displacement distance in Z direction is supplied to an amplifier 11 with a displacement transducer 10 as a thickness signal and is supplied to a differentiation circuit 12 after amplified in an amplifier 11. The displacement distance is differentiated with respect to time with the differentiation circuit 12 to express by a jointing speed and is changed to a thickness signal with a comparison circuit 14. When the melting flow of the material is continuous and the displacement rectilinearly increases with time, the vibration is stopped through a switch 15. A friction joint having improved quality and strength is made thereby.