SAFETY PRECAUTIONS
BEFORE OPERATION
Thoroughly clean the surfaces to be welded. Do not set up for welding
in an area where fumes from flammable or toxic materials are present.
Disconnect the source of power from the welder before performing
any electrical maintenance on the welding set.
DURING OPERATION
Do not attempt to weld unless a welding helmet and flash goggles
are worn. The welding helmet should have a No. 10 or No. 12 shade
welding plate. The flash goggles should have No. 2 shade lenses, with wide
side shields.
Do not attempt to weld unless the skin is completely covered. Wear
leather gloves to protect the hands. Wear light-weight leather clothing to
cotton clothing or light colored clothing. If leather clothing is not avail-
able, wear heavy, dark colored clothing to prevent radiation from penetrat-
ing to the skin or from reflecting onto the neck under the helmet.
Do not weld in a closed area. Provide adequate ventilation against
ozone gas poisoning. Take a regular break out of every welding hour to
get some fresh air.
Provide adequate shielding for the work to protect the eyes of
personnel working in the area.
AFTER OPERATION
Disconnect the source of power from the welder before performing
any electrical maintenance on the welding set.
Performing any field expedient repair creates conditions possibly
dangerous to personnel or equipment. A welding set so repaired should be
taken out of service as soon as possible for replacement of defective parts.
When a malfunction of the selenium rectifier occurs, thoroughly
ventilate the area to prevent the inhalation of poisonous fumes. Do not
handle the damaged rectifier. Selenium oxide may be absorbed through
the skin, especially when the rectifier is hot. Failure to observe this
warning can result in severe illness or death.