Английский для сварщиков. Гричин С.В. - 145 стр.

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145
output on/off control devices. With such equipment, the electrode is
electrically hot when the power switch is turned ON.
Q: How should I store my gas cylinders?
A: Cylinders should be securely fastened at all times. Chains are usually used
to secure a cylinder to a wall or cylinder cart. When moving or storing a
cylinder, a threaded protector cap must be fastened to the top of the cylinder.
This protects the valve system should it be bumped or dropped. Cylinders
should not be stored or used in a horizontal position. This is because some
cylinders contain a liquid which would leak out or be forced out if the
cylinder was laid in a flat position. Also, welding guns and other cables
should not be hung on or near cylinders. A gun could cause an arc against the
cylinder wall or valve assembly, possibly resulting in a weakened cylinder or
even a rupture.
Q: How can I tell if my regulator is faulty?
A: The following symptoms indicate a faulty regulator:
Leaks - if gas leaks externally.
Excessive сreep - if delivery pressure continues to rise with the downstream
valve closed.
Faulty gauge - if gauge pointer does not move off the stop pin when
pressurized, nor returns to the stop pin after pressure release. Do not attempt
to repair a faulty regulator. It should be sent to your designated repair center,
where special techniques and tools are used by trained personnel.
Q: What are some tips for a safe welding environment?
A: The area surrounding the welder will be subjected to light, heat, smoke,
sparks and fumes. Permanent booths or portable partitions can be used to
contain light rays in one area. The heat and sparks given off are capable of
setting flammable materials on fire. Therefore, welding should not be done in
areas containing flammable gases, vapors, liquids or dusty locations where
explosions are a possibility. Metals with plating, coatings or paint that come
near the region of the arc may give off smoke and fumes during welding.
These fumes may pose a health hazard to the lungs, therefore an exhaust
hood or booth should be used to remove fumes from the area. When welding
in confined spaces, such as inside tanks, large containers or even
compartments of a ship, toxic fumes may gather. Also, in an enclosed room,
breathable oxygen can be replaced by shielding gases used for welding or
purging. Care must be taken to ensure enough clean air for breathing. In
many companies, it is routine to provide welders with air masks or self-
contained breathing equipment.
Q: How should an operator dress for optimum safety?
A: Gloves and clothing should be flame-resistant. Clothing made from a
dark-colored, tightly woven material is best suited for welding. Gauntlet-type

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