| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas cutting burner capable of strengthening preheating, in the present invention.SOLUTION: A gas cutting burner comprises a nozzle member 3 provided with a cutting oxygen passage 2 along the axial direction on the inside and a cover member 5 for forming a preheating mixed gas passage 4 fitted to the outside of the nozzle member 3 along the axial direction between an outer peripheral surface 3a of the nozzle member 3 and itself, and the outer peripheral surface 3a of a tip part 3b of the nozzle member 3 is formed with a plurality of linear groove parts 7a and 7b at a predetermined pitch in the circumferential direction of the nozzle member 3 along the axial direction of the nozzle member 3 on the outer peripheral surface 3a of a tip part 3b of the nozzle member 3, and the plurality of linear groove parts 7a and 7b are provided by arranging the first linear groove part 7a formed by having the first depth D1 from the outer peripheral surface 3a of the nozzle member 3 and the second linear groove part 7b formed by having the second depth D1 shallower than the first depth D1 in the depth from the outer peripheral surface 3a of the nozzle member 3, in a predetermined combination.SELECTED DRAWING: Figure 3 |
