an exothermic cutting electrode or burning bar having an oxidizable metal fluid conduit surrounded by alternate layers of wire wound helically in opposite directions , the entire structure covered with an outer oxidizable metallic tube , either end of the electrode being adapted for connection to a source of oxidizing fluid and electric current , so that an arc can be struck between a work - piece and the free end of the electrode to produce a cutting flame . by proper selection of the type and size of materials of construction the electrode will burn after the electric current has been turned off .