The coating of electrodes is produced by extrusion presses which is where the briquettes of flux are pushed through a cylinder at a pressure. When the wire is placed into the magazine for wires that is part of an electrode press, the briquettes are inserted into the extrusion cylinders in the press. In the course of operation, the primary wire gets fed one at a time one, and then coated with flux through the nozzles in the die box of an extrusion presses. In the welding electrode plant, extruder is the primary machine.