An electrode must not be allowed to stick to
A gas hose, torch, gage, or regulator must
work, causing a short circuit, longer than a few seconds.
be disconnected from the tank before being repaired.
An electrode holder must not be left where it can be
Performing cutting, welding, or heating
knocked or dropped on work, causing a short circuit.
operations on a container, a corded casting, a pipe,
There must be no attempt to start a machine while a
plugged holes, etc. unless the material is properly
short circuit exists.
vented or drilled to permit escape of gas, steam, or hot
Worn or poorly connected welding cables
air is prohibited.
must not be used.
A flint lighter will be used to light a gas
An electric arc must not be looked at with
cutting or welding torch. Using a match or other source
the naked eye at a distance of less than 40 feet.
of open flame for this purpose is prohibited. The torch
Welders must completely surround an arc with a dark
will be held in a downward position and in a direction
curtain or screen to protect other workmen from arc
away from other personnel.
Using oil or grease on a gas torch, gage,
A cracked filter glass or a cracked helmet
regulator, or hose connection is prohibited.
must never be used
Before cutting through a sheet, a plate, or
Welding in confined places without suitable
any other part, personnel must assure themselves that
ventilation is prohibited.
there is no one on the other side who might be burned.
Welding on hollow castings without
Laying an object to be heated, cut or welded
providing vent holes for air In the cavity is prohibited.
across s gas or an air cylinder is prohibited.
Striking an arc on oxygen, acetylene, or
Leaving oxyacetylene torches on pressure
other gas cylinders is prohibited.
lines, unless the valves at the other end of the hose are
closed, is prohibited.
Containers used for volatile or flammable
liquids must not be welded until all traces of such
Throwing, dropping, or otherwise roughly
material have been completely removed.
handling a gas cylinder, whether empty or loaded is
Use of Ladders, Trestles, Platforms, or
Allowing gas cylinders to stand near
furnaces, steampipes, or other sources of heat is
Personnel will face cars, scaffolds, trestles,
prohibited m. When the cylinder is not in use, the valve
or ladders when climbing on or leaving them A secure
must be closed and the key removed. it. The use of
handhold and a firm footing are essential.
leaking gas cylinders is prohibited Leaking cylinders will
be removed to the open air to an area clear of
When climbing, it is prohibited to carry tools
flammable material or anything that will cause gas to
or material which prevent a secure handhold or which
interfere with safe movement.
Using an open flame or smoking in gas
Placing a ladder on a box, a barrel, a block,
storage buildings is prohibited.
or any other insecure object to extend its reach is
Using leaking hose or connections on gas
cylinder is prohibited.
Using a straight ladder not equipped with
spikes or nonslip bases suitable for the surface on which
Changing or adjusting pressure
it is to be used, unless lashed or otherwise secured, is
regulators with torch valves closed is prohibited.
r. Laying down a lighted torch is prohibited.
A ladder in use at a location where persons
or vehicles are likely to collide with it will be guarded by
Passing a lighted torch from one man to
a man assigned for the purpose, or will be otherwise
another or climbing with a lighted torch is prohibited.
When cylinders are stored or in use, valves
Use of weak, cross-grained, or otherwise
should be In an upright position.
unsuitable material for scaffolds, platforms, ladders, or
21-10. Electric Arc Welding
handrails is prohibited.
Voltage, current, or polarity controls of
Use of a scaffold or a platform made of
portable machines must not be adjusted while they are
loose boards, not equipped with end stops to keep them
under load. A resistor unit switch must never be opened
from sliding or coming off the supporting trestle, horse,
or closed while current is passing through the unit.
brace, or bracket, is prohibited.