yield point, elastic limit, modulus of elasticity, and other
properties of the material.
You, as the welder, must have a thorough KNOWL-
EDGE of the safety precautions relating to the job. That
is not all; you should also consider it your responsibility
to observe all of the applicable safety precautions. When
welding, carelessness can cause serious injury to your-
self as well as others.
Bear in mind the safety precautions for operating
welding equipment can vary considerably because of
the different types of equipment involved; therefore,
only general precautions on operating metal arc-weld-
ing equipment are presented here. For specific instruc-
tions on the operation and maintenance of your
individual equipment, consult the equipment manufac-
turers instruction manual. In regards to general precau-
tions, know your equipment and how to operate it. Use
only approved welding equipment, and ensure that it is
l Before you start welding, ensure that the welding
machine frame is grounded, that neither terminal of the
welding generator is bonded to the frame, and that all
electrical connections are secure. The ground connec-
tion must be attached firmly to the work, not merely laid
loosely upon it.
l Keep welding cables dry and free of oil or grease.
Keep the cables in good condition and always take
appropriate steps to protect them from damage. When it
is necessary to run cables some distance from the ma-
chine, lay them overhead, if at all possible, using ade-
quate support devices.
Q When you are using portable machines, make
sure that the primary power cable is separate from the
welding cables so they do not become entangled. Any
portable equipment mounted on wheels should be se-
curely blocked to prevent accidental movement during
l When stopping work for any appreciable length
of time, be sure to de-energize the equipment. When the
equipment is not in use, you should completely discon-
nect it from its source of power.
. Keep the work area neat and clean. If at all
possible, make it a practice to dispose the hot electrode
stubs in a metal container.
Chapter 3 contains information on protective cloth-
ing, eye protection, and safe practices applicable to the
personal safety of the operator and other persons who
may be working nearby so that information will not be
repeated here. If necessary, go back and review the
section entitled Safety in chapter 3 before proceeding
to the next chapter.