Abstract: The specification describes a nozzle for welding, heating, cutting and/or flame cleaning, comprising a cutting oxygen duct with an internal mixing device, arranged in the nozzle head, for heating gas and heating oxygen. There are also metering channels, possibly arranged around the centrally placed oxygen duct, for heating gas and heating oxygen. The heating oxygen metering ducts and the heating gas metering ducts open separately into a mixing chamber. From the mixing chamber an annular heating mixture duct leads to the gas outlet nozzle shank end.