Portable Oxy-Fuel Welding and Cutting Outfit
Set-Up (Cont.)
CHECKING FOR LEAKS
Inspect the system for leaks before every use as follows:
1.With system purged, close both gas cylinder valves.
2.Turn both regulator adjusting screws
3.If the high pressure gauge reading drops, there is a leak in the cylinder valve, inlet fitting, or high pressure gauge. If the low pressure gauge drops, there is a leak in the torch handle valve, hose, hose fitting, outlet fitting or low pressure gauge.
4.Use an approved leak detector solution to check for leaks. If the high pressure gauge drops, and at the same time the low pressure gauge rises, there is a leak in the regulator seat. Have a qualified technician repair the regulator.
Operation
hissing or squealing noise. If flashback occurs, close the torch handle valves (oxygen first), IMMEDIATELY. Flashback generally indicates a problem that should be fixed. A clogged tip, improper functioning of the valves, or incorrect acetylene/oxygen pressure could lead to flashback. Be certain to find the cause before relighting the torch.
1.Open torch fuel valve one quarter turn. Click spark lighter in front of torch tip to ignite the fuel gas. Point the flame away from persons, cylinders, or other flammable materials (see Figure 14).
continue to adjust the preheat oxygen until the preheat flame is neutral again.
Shut Down
It is important to follow these instructions exactly as shown to prevent equipment damage.
1.Close the torch oxygen valve.
2.Close the torch fuel valve.
3.Close the cylinder valves to both gasses.
4.Open the oxygen torch valve to bleed off all oxygen.
5.Close the oxygen torch valve.
6.Open the fuel torch valve to bleed.
7.Close the fuel torch valve.
8.All pressure gauges should read
0 PSI. Turn both pressure adjusting screws
Lighting Torch
NOTICE | The following | |
instructions are for | ||
|
acetylene gas use only. Contact your gas supplier for instructions on the use of other fuel gases.
Before lighting
the torch, follow all
personal and equipment safety regulations. Wear filtered protective eyewear (shade 5 minimum) to protect the eyes from heat, sparks and hazardous rays of light produced by the flame. Keep work area well ventilated.
BACKFIRE AND FLASHBACK
When the flame goes out with a loud pop, it is called a backfire. Backfire can be caused by (1) operating the torch at lower pressures than required for the tip used, (2) touching the tip against the work, (3) overheating tip, or (4) an obstruction in the tip. If backfire occurs, shut off the torch handle valves (oxygen first) and after remedying the cause, relight the torch.
A flashback is a condition that results when the flame flashes back into the torch and burns inside with a shrill
Figure 14 - Igniting fuel gas
Never use matches
! WARNING to start torch as initial puff of flame may burn hands.
2.Adjust the torch fuel valve until the flame stops smoking and leaves the end of the tip about 1/8”, then reduce slightly to bring flame back to tip.
3.Open the torch oxygen valve (for cutting attachment, open preheat valve ) until a neutral flame appears (see Figure 15).
If you experience a backfire or
flashback (a hissing sound caused by the flame burning inside the mixer area), IMMEDIATELY turn off the oxygen torch valve. Then turn off the fuel valve. Follow shut down procedures and allow the torch to cool before use. If trouble persists, contact a qualified technician.
ADDITIONAL ADJUSTMENTS FOR CUTTING ATTACHMENT:
4.Depress the cutting oxygen lever. Note that the preheat flame may change slightly from neutral to a carburizing flame with a feather.
5.With the cutting oxygen flowing,
PURE ACETYLENE FLAME
Inner Cone White | Bluish to |
| Orange |
Nearly Colorless |
|
CORRECT NEUTRAL FLAME
Inner Cone White | Nearly |
| |
| Colorless |
Bluish to Orange |
|
OXIDIZING FLAME |
|
Too much oxygen |
|
Acetylene |
|
Feather | Light |
Inner Cone | |
| Orange |
White |
|
CARBURIZING FLAME
Too much acetylene
Figure 15 - Acetylene Flames
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