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焊割作业中怎样防止回火? | 2009-3-4 9:03:00
回火,指的是可燃混合气体在焊炬、割炬内发生燃烧,并以很快的燃烧速度向可燃气体导管理蔓延扩散的一种现象,其结果可以引起气焊和气割设备燃烧爆炸。防止回火的主要原理是利用中介将倒回的火焰和可燃气体进行隔开,使火焰不能进一步蔓延。防止回火,在操作过程中应做到:焊(割)炬不要过分接近熔融金属;焊(割)嘴不能过热;焊(割)嘴不能被金属溶渣等杂物堵塞;焊(割)炬阀门必须严密,以防氧气倒回乙炔管道;乙炔不能开得太小,如果发生回火,要立即关闭乙炔发生器和氧气阀门,并将胶管从乙炔发生器或乙炔瓶上拔下。如乙炔瓶内部已燃烧(白漆皮变黄、起泡),要用自来水冲浇降温灭火。
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