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气割是利用气体火焰(氧-乙炔、氧-液化石油气)将金属加热到燃点,并使高压氧气流下剧烈氧化(燃烧)生成的熔渣被高压氧气射流吹掉。当燃烧发出的热量足以把金属加热到燃点时,加热一燃烧一吹渣过程能连续进行,并随着割嘴的移动而形成割缝。氧-乙炔焰可以割3.0毫米厚度钢板。割薄钢板时,因钢板较薄,氧化铁渣不易吹掉,而且冷却后氧化铁渣粘在钢板背面不易铲除。切割速度如稍慢或预热火焰控制不当,容易使钢板变形过大,而且钢板正面棱角也被熔化,形成前面割而后面又熔合在一起的现象。
Gas cutting is the use of gas flame (oxygen-acetylene, oxygen - liquefied petroleum gas) to heat the metal to the ignition point, and make the slag generated by the intense oxidation (combustion) of the high pressure oxygen stream blown off by the high pressure oxygen jet. When the heat from the combustion is sufficient to heat the metal to the ignition point, the heating-burning-slagging process continues and the kerf is formed as the cutting nozzle moves. Oxygen-acetylene flame can cut 3.0 mm thick steel plate. When the thin steel sheet is cut, the iron oxide slag is not easily blown off due to the thinness of the steel sheet, and the iron oxide slag adheres to the back of the steel sheet after the cooling is not easy to remove. If the cutting speed is slightly slower or the preheating flame is not properly controlled, the steel sheet is easily deformed too much, and the front edge of the steel sheet is also melted, forming a phenomenon that the front side is cut and the back side is fused together.