IK-12 NEXT
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5.8 Safety measures against backfire and flashback
5.8.1 Prevention of backfire
Backfires may cause serious accidents or fires. 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 following are causes of backfire:
1
）
Improper gas pressure adjustment.
2
）
Overheated tip.
3
）
slag clogged in tip.
4
）
damage to the tapered section of the tip or torch will cause backfire.
5.8.2 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.
5.9 Cutting operation
1. Place the tip along the marked cutting line.
2. Set Multi-function selector switch to SPEED
①～③
3. Open the gas valve and slightly open the preheating oxygen valve, and then ignite the oxygen
with an ignition lighter. Then fully open the gas valve and make the flame neutral by controlling
the preheating oxygen.
4. Adjust the height of the tip as against the steel sheet. (2-3 mm from the tip of the white point)
5. Engage the clutch, and after sufficient preheating, open the oxygen valve and turn on the
forward or backward switch simultaneously. Then cutting operation will begin.
6. When cutting begins, carefully observe the cutting condition to set the optimum cutting speed.
7. After cutting, close the cutting oxygen valve and turn off the switch. Then close the gas valve
and preheating oxygen valve in this order, and return the clutch to the stop position.
[Note]
● Check that the flow of cutting oxygen is at the right angles to the steel sheet.
● For correct cutting, set the gas pressure according to the Cutting Data. Correct the gas pressure
according to the actual cutting conditions.
5.9.1 Straight cutting
The use of a high-accuracy plate rail ensures correct straight cutting. Plate rails are of a
connection type, and connection of several rails will permit straight cutting of objects of any length
