Английский для сварщиков. Гричин С.В. - 79 стр.

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79
Clean the orifices of the cutting torch tip in the same manner as the
single orifice of the welding torch tip. Remember: the proper technique for
cleaning the tips is to push the cleaner straight in and out of the orifice. Be
careful not to turn or twist the cleaning wire. Figure above shows a typical set
of tip cleaners.
Occasionally the cleaning of the tips causes enlargement and distortion
of the orifices, even when using the proper tip cleaners. If the orifices
become enlarged, you will get shorter and thicker preheating flames; in
addition, the jet of cutting oxygen will spread, rather than leave the torch, in
the form of a long, thin stream. If the orifices become belled for a short
distance at the end, you can sometimes correct this by rubbing the tip back
and forth against emery cloth placed on a flat surface. This action wears
down the end of the tip where the orifices have been belled, thus bringing the
orifices back to their original size.
Obviously, this procedure will not work if the damage is great or if the
belling extends more than a slight distance into the orifice. After
reconditioning a tip, you may test it by lighting the torch and observing the
preheating flames. If the flames are too short, the orifices are still partially
blocked. If the flames snap out when you close the valves, the orifices are
still distorted.
If the tip seat is dirty or scaled and does not properly fit into the torch
head, heat the tip to a dull red and quench it in water. This will loosen the
scale and dirt enough so you can rub it off with a soft cloth.
Speaking
True or false?
1. Oxygas cutting outfit and cutting rig are different things.
2. A gang wrench is used to light the torch.
3. Acetone has a favourable effect on the cutting equipment.
4. The acetylene cylinder is painted blue.
5. MAPP is a very toxic gas.
6. Acetone is a solid body that dissolves large portions of acetylene under
pressure.
7. Cylinder valve should be opened slowly to prevent explosion.
8. Local eye or skin contact with MAPP liquid fuel gas can cause dangerous
frostlike burns.
9. Twist drills, nails, or welding rods must not be used for cleaning tips.

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