IGNITION DEVICE FOR EXOTHERMIC WELDING, MOLD FOR EXOTHERMIC WELDING FOR THE IGNITION DEVICE, AND APPARATUS FOR EXOTHERMIC WELDING COMPRISING SUCH A MOLD AND SUCH AN IGNITION DEVICE.

摘要

The present invention relates to an ignition device for exothermic welding comprising an electrically conductive metal bushing (1) that can house a pellet of a first welding material in electrical contact with the inner wall of an inner chamber of the bushing (1), provided with an electrically insulating cap and a bottom base with an opening through which the first welding material falls in an incandescent state onto a second welding material arranged in a weld mold (7) when an exothermic reaction has been triggered in the first welding material; an electrode that goes through the cap of the metal bushing (1) and comprises a top contact connectable to a power output (24b) of a voltage generator (10) and a bottom contact in the form of a filament that can be in electrical contact with the pellet of the first welding material, the filament being made of a material having a melting temperature greater than the ignition temperature of the welding material; as well as a contact-assuring element which is guided into the inner chamber between the bottom base and the pellet of the first welding material.