External powder feed scarfing process and apparatus

Claim 1

IN A PROCESS FOR SCARFING AN OXIDATION RESISTANT METAL BODY BY THE APPLICATION OF A WIDE RIBBONLIKE OXYGEN STREAM OBLIQUELY AGAINST THE WORK SURFACE ASSISTED BY PREHEAT FLAMES AND BY A RIBBONLIKE STREAM OF ADJUVANT POWDER MATERIAL OF APPROXIMATELY THE SAME WIDTH AS THE OXYGEN STREAM, SAID POWDER STREAM BEING FED AT AN ACUTE DIHEDRAL ANGLE TO THE OXYGEN STREAM THROUGH THE PREHEAT FLAME ONTO THE OXYGEN STREAM WHICH THEN PROJECTS THE POWDER TOWARD THE WORK SURFACE AT THE LEADING PORTION OF THE REACTION ZONE THEREON, AND THE ADVANCE OF SUCH COMPOSITE STREAM RELATIVELY ALONG THE WORK SURFACE IN THE GENERAL DIRECTION OF THE STREAM THEREON, THE COMBINATION THEREWITH OF THE STEP OF DIRECTING AT AN ACUTE ANGLE AND SUBSTANTIALLY IN THE PLANE OF SAID OXYGEN STREAM AN AUXILIARY STREAM OF A DILUTING GAS SUCH AS AIR INTO AT LEAST ONE SIDE EDGE OF THE COMPOSITE STREAM TO ELIMINATE THE UNDESIRED CUTTING ACTION OF SUCH SIDE EDGE OF THE COMPOSITE STREAM, IN WHICH THE ANGLE BETWEEN THE AUXILIARY STREAM AND SCARFING STREAM DIRECTIONS OF FLOW IS BETWEEN 5 AND 30 DEGREES AND SAID AUXILIARY STREAM MEETS THE SCARFING STREAM PRIOR TO IMPINGEMENT OF THE SCRAFING STREAM UPON THE WORK SURFACE.