Method of flame machining j-grooves

Claim 1

A PROCESS FOR FORMING A J-GROVE, CONSISTING OS A NOSE SECTION OR BASE, A SIDE WALL AND A CURVED SECTION BETWEEN SAID BASE AND SIDE WAAL, IN A SURFACE OF A METAL BODY, WHICH COMPRISES PREHEATING SAID SURFACE TO BE J-GROVED TO IGNITION TEMPERATURE, PROVIDING A SUBSTANTIALLY FLAT LATERALLY ELONGATED OXIDIZING GAS STREAM HAVING A LONGITUDINAL CENTERLINE AND A TRANSVERSE AXIS TO THERMOCHEMICALLY REMOVE METAL FROM SAID PREHEATED SURFACE TO BE J-GROVED. IMPINGING SAID ELONGATED OXIDIZING GAS STREAM AGAINST SAID PREHEATED SURFACE AT AN ACUTE ANGLE, DIRECTION SAID ACUTELY IMPINGING OXIDIZING GAS STREAM SUCH THAT THE PROJECTION OF THE CENTERLINE THEREOF ONTO THE SURFACE TO BE J-GROVED IS AT A LLALTERAL ANGLE TO THE EDGE OF SAID NOSE SECTION OR BASE OF SAID J-GROOVE TO BE FORMED TO OBTAIN THE DESIRED CURVED SECTION BETWEEN SAID BASE ABD SAID SIDE WALL, INCLIINING SAID SUBSTANTIALLY FLAT LATERALLY ELONGATED OXIDIZING GAS STREAM TO OBTAIN SAID FORMED BETWEEN SAID SURFACE TO BE J-GROOVED AND THE TRANSVERSE AXIS OF SAID OXIDIZING GAS STREAM TO OBTAIN SAID SIDE WALL, SPACING ONE EDGE OF SAID SUBSTANTIALLY FLAT LATERALLY ELONGATED OXIDIZING GAS STREAM FROM A EDGE OF SAID PREHEATED SURFACE TO FORM THE NOSE SECTION OR BASE OF SAID J-GROVE. CAUSING SUCH OXIDIZING GASSTREAM TO HAVE A UNIFORM VELOOCITY FRONT ACROSS THE FACE THEROF WHEN SUCH STREAM IMPINGES SAID SURFACE TO PROVIDE A UNIFORMLY SMOOTH J-CONTOURED GROVE, PROGRESSIVELY PROVIDING RELATIVE MOTION BETWEN SAIDI OXIDIZING GAS STREAM AND SAID SURFACE TO BE J-GROVED AT A SUBSTANTIALLY CONSTANT SPEED AND CORRELLATING SAID CUTTING SPEED WITH SAID UNIFORM VELOCITY FRONT THEREBY PRODUCING A J-GROVE OF PREDETERMINED UNIFORMLY SMOOTH CONTOUR DEPTH WITH A SINGLE PASS OF SAID OXIDIZING GAS STREAM