Patent ID: 6722556
Filing Date: 2004-04-20
Classification: B23K

Abstract:
A method for joining at least two adjoining workpieces by friction welding in an area in which said at least two workpieces are disposed adjacent one another utilizing a pin-like projection, said method comprising the steps of rotating said pin-like projection, moving said pin-like projection toward said adjoining workpieces in the area where they are to be joined and moving said pin-like projection through the top workpiece and into the lowermost workpiece while plasticizing the material of said workpieces adjacent said rotating pin-like projection whereby some of said plasticized material is displaced and then retracting said pin-like projection from said workpieces and re-inserting the displaced plasticized material into the space voided by the retraction of said pin-like projection about at the same rate at which said pin-like projection is retracted.