GAS CUTTING BURNER

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 【課題】 本発明は、予熱を強く出来るガス切断火口を提供する。【解決手段】 内部に軸方向に沿って切断酸素通路２が設けられたノズル部材３と、該ノズル部材３の外側に嵌装され、該ノズル部材３の外周面３ａとの間に軸方向に沿って予熱用混合ガス通路４が形成されるカバー部材５と、を有し、ノズル部材３の先端部３ｂの外周面３ａに該ノズル部材３の軸方向に沿って該ノズル部材３の周方向に所定ピッチで複数の線状溝部７ａ，７ｂが形成され、該複数の線状溝部７ａ，７ｂは、該ノズル部材３の外周面３ａから第一の深さＤ１を有して形成された第一の線状溝部７ａと、該ノズル部材３の外周面３ａからの深さが該第一の深さＤ１よりも浅い第二の深さＤ１を有して形成された第二の線状溝部７ｂとを所定の組み合わせで配置したことを特徴とする。【選択図】 図３