The function of a cutting torchIt is to mix oxygen and acetylene in proportion to form a preheating flame, and inject high-pressure pure oxygen onto the workpiece being cut, causing the cut metal to burn in the oxygen jet. The oxygen jet blows away the slag (oxide) generated by the combustion to form a slit. A cutting torch is the main tool for gas cutting workpieces.
Tool classification:
Cutting torches are divided into two types based on the mixing method of oxygen and acetylene in the preheating flame: jet suction and isobaric. Among them, jet suction cutting torches are the most commonly used. Cutting torches are divided into ordinary cutting torches, heavy-duty cutting torches, and dual-purpose welding and cutting torches according to their purposes.
Tool usage:
(1) The selection of a suitable cutting nozzle should be based on the thickness of the workpiece being cut. When assembling the cutting nozzle, it is necessary to keep the inner and outer nozzles concentric to ensure that the cutting oxygen jet is located at the center of the preheating flame. When installing the cutting nozzle, pay attention to tightening the cutting nozzle nut.
(2) Check the injection and suction situation of the injection and suction cutting torch. Only after the injection and suction situation is checked to be normal, can the acetylene hose be connected, with no air leakage and easy insertion and removal as the standard. When using an isobaric cutting torch, it is necessary to ensure that acetylene has a certain working pressure.
(3) After ignition, if the flame immediately goes out when the preheating oxygen regulating valve is turned on to adjust the flame, the reason is that there are dirt in each gas channel or the nozzle mouth of the injection tube is not tightly connected, as well as improper fit between the cutting nozzle jacket and the inner nozzle. At this point, the suction tube nut should be tightened; When it is ineffective, the suction tube should be removed, the dirt in each gas channel should be cleared, and the gap between the outer and inner sleeves of the cutting nozzle should be adjusted and tightened.
(4) After the preheating flame is adjusted to normal, there is a rhythmic "honk, honk" sound from the cutting head, but the flame does not go out. If the cutting oxygen is turned up, the flame immediately goes out. The reason is that there is a leak at the cutting head core. At this point, the cutting nozzle cover should be removed, and the nozzle core should be gently tightened. If it still does not work, the cover can be removed again and padded with asbestos rope.
(5) The improper coordination between the cutting nozzle and the cutting torch resulted in a normal flame after ignition, but when the cutting oxygen regulating valve was opened, the flame immediately extinguished. The reason is that the cutting head and cutting torch are not tightly matched. At this point, the cutting nozzle should be tightened. If it is ineffective, the cutting nozzle should be removed and gently sanded with fine sandpaper. Grind the mating surface of the cutting head until it fits tightly.
(6) When tempering occurs, the cutting oxygen regulating valve should be immediately closed, followed by the acetylene regulating valve and preheating oxygen regulating valve. When normal work stops, attention should be paid to the oxygen cutting control valve first, and then the acetylene and preheating oxygen control valves should be closed.
(7) Keep the cutting nozzle channel clean. The cutting nozzle channel should be kept clean and smooth regularly, and any dirt inside the hole should be removed with a needle at any time.
(8) Clean the surface of the workpiece to remove thick rust, oil, and dirt. When cutting on cement ground, the workpiece should be elevated to prevent rust and slag from splashing and injuring people on the cement ground.