Induction heating apparatus and method of securing two workpieces or sheets.

摘要

A device for inductively heating and fusing thermoplastics includes an alternating current passing through a tank circuit, the inductor member of the tank circuit being wrapped around a curved pole piece of a ferromagnatic material. The magnetic flux arising within the inductor coil member (29) flows to the ends of the pole piece (20) and is formed into a screen (45) placed between the materials to be joined. The flux induces a current in the screen, and heat is generated to melt the thermoplastics (41, 43) together. Only 30-150 watts of power need be passed through the tank circuit, as a wire which will remain cool under operational wattage may be selected, making air or fluid cooling unnecessary. The device can be used for joining thermoplastic workpieces, or for joining non-thermoplastic workpieces by means of a fastener containing thermoplastic material.