Notice, Operation safety, Welder duty cycle – Grizzly H8155 User Manual

Page 11

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H8155 MIG Welder

-9-

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

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.

Welder Duty Cycle

As the welder produces the desired power output
for the welding operation, power is converted to
heat. In order to protect the welder components
from over-heating, each welder has an estab-
lished duty cycle, which varies depending on the
amperage output being used.

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 H8155 has a duty cycle
of 45% at 50A output. This means that the welder
can operate continuously for 4.5

minutes at 50A

output, then the arc must be stopped to allow the
welder, using the cooling fan, to cool off for at
least 5.5 minutes before starting the arc again.

The Model H8155 has a cooling fan and an inter-
nal thermostat that will shut the welder down if
the duty cycle is exceeded. This will be evident by
the loss of welding circuit and the orange warn-
ing light on the face of the welder will illuminate.
When the welder has cooled sufficiently, the inter-
nal thermostat will re-establish the welding circuit
and the orange warning light will go out.

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

lead will immediately carry live welding cur-

rent. Ignoring this warning could result in

serious personal injury or death.

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