-10-
H8154 AC/DC Stick/TIG Welder
SECTION 4: OPERATIONS
NOTICE
If you have never used this type of machine
or equipment before, WE STRONGLY REC-
OMMEND that you read books, trade maga-
zines, or get formal training before begin-
ning any projects. Regardless of the con-
tent in this section, Grizzly Industrial will
not be held liable for accidents caused by
lack of training.
Operation Safety
Welder Duty Cycle
A duty cycle is the number of minutes out of 10
minutes that the welder can safely operate at the
current amperage output without over-heating.
For instance, the Model H8154 has a stick duty
cycle of 35% at 130A output. This means that the
welder can operate continuously for 3.5
minutes
at 130A output, then the arc must be stopped for
at least 6.5 minutes to allow the welder to cool
off before starting the arc again. It is important to
leave the main power to the welder
ON
so that the
cooling fan can speed the cooling process.
The Model H8154 operates with an efficient cool-
ing fan (at the rear of the welder) and has an
internal thermostat that will shut the welder down
if the maximum duty cycle has been reached.
Shutdown will be evident by the loss of welding
circuit and the illumination of the yellow warning
light on the face of the welder. When the welder
has cooled sufficiently, the internal thermostat
will re-establish the welding circuit and the yellow
warning light will go out.
Note:
Most electrodes used with stick welding are
consumed within a few minutes, so the welder
has a chance to cool down when the welding cir-
cuit is stopped to install a new electrode.
However, with TIG welding, the operator needs to
plan his work within the duty cycle constraints of
the welder.
Damage to your eyes and lungs could result
from using this machine without proper
protective gear. Always wear safety glasses,
welder's helmet, and a respirator when oper-
ating this welder.
As the welder produces the desired power output
for the welding operation, some of the power is
converted to heat. In order to protect the welder
components from over-heating, each welder has
an established duty cycle. The duty cycle is vari-
able depending upon the amperage output being
used.
Always treat the welding components as if
they carry live welding current, even when
the welder reaches the duty cycle limit and
shuts down. When the welder re-establishes
the welding current, the electrode and work
leads will immediately carry live welding cur-
rent. Ignoring this warning could result in
death or serious personal injury.
