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oxygenized flame will lead to an increase of efficiency and set the speed with a decrease of
20%~30%.The bevel cutting surface in the diagram is a result of inadequate preheating,
which requires to change the tip and readjustment of the preheating and speed.
4.7 Safety measures against backfire and flashback
4.7.1 Prevention of backfire
Backfires may cause serious accidents or fire. Be careful to prevent such disaster. When a
Backfire occurs, find the cause and inspect and maintain the machine correctly before using
the machine again.
The followings are causes of backfire:
1. Improper gas pressure adjustment
2. Overheated tip
3. Slag clogged in tip
4. Damage to the tapered section of tip or torch will cause backfire.
4.7.2 Prevention of flashback
Flashback could cause fire and break the machine. Should there be a hissing sound in the
torch, quickly take the following action:
1. Close the preheating oxygen valve.
2. Close the fuel gas valve.
3. Close the cutting oxygen valve.
Should flashback occur, find the cause and take appropriate action before using the machine
again.
Maintenance and inspection
6
Refer to the following points for maintaining and inspecting the machine in order to use the
machine under the best conditions.
6.1 Maintenance of the gear case
1. Because there are gears that run at a high speed in the gear case, so the operator should
remove the shell of the machine, take out the gear case and wash the gears and the case
with detergent every seven months. When reassembling, we should put new lubricant into
the machine. If the turbine is abraded, we must change a new one.
2. The big rotary gear is an important part, so the gear slot should be kept clear and
lubricated and the operator must add lubricant every time. If there are sundries in the gear
slot, the operator must take them out immediately and wash the gear slot, and add new
lubricant.
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CG1-2A H Beam cutter
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