2. Adjust the flame: when adjusting the flame, first slightly open the oxygen valve, then slightly open the acetylene valve, so that the combustible mixed gas can be ejected from the cutting torch, then hold the middle of the cutting torch with 1 left hand, so that the cutting nozzle faces away from the human body, light the cutting torch with the right hand, then hold the cutting torch with the right hand, and adjust the oxygen and acetylene valves to make the preheating flame neutral. The simplest and practical way to judge the properties of oxyacetylene flame is to observe the combustion form of oxyacetylene flame.
3. Gas cutting: after the welding torch is lit and the flame is adjusted, the cutting can be carried out: the feet are squatting on one side of the workpiece in the shape of an outer shape, the right arm rests on the right knee, and the left arm is placed between the legs, which is convenient for moving during gas cutting. Whether standing or squatting, the center of gravity should be stable, the arm muscles should be relaxed and breathe naturally, the cutting torch should be cut flat, the arm should move slowly or with the body according to the requirements of cutting speed, and the main body of the cutting torch should be parallel to the upper plane of the cut object.