Method and apparatus for producing a molten puddle during scarfing

摘要

A method for producing a molten puddle on the surface of a metal workpiece to be scarfed consists of igniting a mixture of fuel gas and oxygen. The resultant flame is used for heating a steel wire to a temperature of from 900 DEG to 1450 DEG C., whereupon the steel wire is intermittently fed into a stream of scarfing oxygen to produce droplets of molten metal, which are then transferred by a flow of scarfing oxygen on to the work surface. There is provided apparatus for carrying into effect the above method, which comprises a housing having ducts for supplying a fuel gas and oxygen formed on its periphery; an additional duct for supplying a fuel gas being made in the central part of the housing; a duct for feeding steel wire is provided in the housing in coaxial arrangement with the additional fuel gas supply duct; a scarfing oxygen feeding duct formed in the housing is interposed between the oxygen supply duct and the additional fuel gas supply duct. The duct for feeding a scarfing oxygen is made in the form of a tapered annular slot arranged to permit the stream of scarfing oxygen to be directed at one point on the surface of steel wire.