作为火焰切割用的气体主要是氧气和燃气,现综述于下:一、氧气——是一种无色、无味、比重为1.106的双原子气体,约占空气的21%,助燃(氧化)性极好。氧气的制取是采用液化——蒸馏法进行的。当液态空气在零下196℃时,氮气就开始蒸发了。当液温上升到零下183℃时(即氧气的沸点),就能得到纯度较高的气态氧气,一般可达99.5%以上。氧气的纯度,对于切割速度和切割质量均具有极大的影响。据有关资料报道氧气纯度从99.5%增至99.8%,其切速可提高25%;反之,氧气纯度 Oxygen - is a colorless, odorless, diatomic gas with a specific gravity of 1.106, accounting for about 21% of the air, combustion-supporting (oxidizing) Excellent. Oxygen is prepared by liquefaction - distillation method. When the liquid air at minus 196 ℃, nitrogen began to evaporate. When the liquid temperature rose to minus 183 ℃ (ie, the boiling point of oxygen), can get high purity gaseous oxygen, generally up to 99.5%. The purity of oxygen has a great influence on cutting speed and cutting quality. According to the information reported oxygen purity increased from 99.5% to 99.8%, the cutting speed can be increased by 25%; the other hand, oxygen purity