Procedure of electric welding of protective on a metal piece and device for the put into practice of this procedure. (Machine-translation by Google Translate, not legally binding)

摘要

Method of electrical welding of protuberances on the wall of a metal part, such as a tube in which the protrusion and the tube or the like are connected to a current source, in such a way that the fact of disposing said protuberance, protected by a anti-oxidant agent, in contact with said birth tube to an arc that gives off the heat necessary for welding, said method being characterized in that it consists of limiting the application pressure of the protuberance, and therefore its penetration, to a determined value in order to prevent the deformation of the tube and the foundation of residual stresses in the metal of the tube in the course of the welding operation, because this pressure is limited by cutting off the supply current when said protrusion has traveled a certain stroke, because a local reheating of the tube or similar is carried out in the vicinity of the welding in order to avoid contraction b rusca of the metal due to the adjacent welds because, the protuberances are protected against oxidation by means of a coating paste arranged so as to form, at the end of the protrusion intended to be welded with the tube, a protective crown that overlaps axially said end, because the coating of the protuberance can be performed by immersion, compression or vibration, because after the coating of the protuberances, it is first proceeded to drying in a cold air stream for eight to twelve hours, then to a treatment in stove at a temperature of 90 to 110º for one to three hours, and because the drying time is preferably chosen for about ten hours and the oven treatment is preferably carried out for two hours at 110º. (Machine-translation by Google Translate, not legally binding)