Harbor Freight Tools 55525 - Manual (Page 17)

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Page 17 SKU 55525
OpERAtInG InstRUCtIOns
bEfORE yOU bEGIn WELDInG
Good welding requires a high degree of skill and experience. You should practice
a few sample welds on scrap metal before you begin welding your first project. Ad-
ditional practice periods are recommended whenever you weld a different thickness
of material, wire, or weld a different type of connection.
DUty CyCLE (DURAtIOn Of UsE)
CAUtIOn! Avoid damage to the Welder by not leaving the unit on for more than
the prescribed duty cycle time.
fIGURE K
The duty cycle defines the number of minutes, within a 10 minute period, during
which a given Welder can safely produce a particular welding current. for example,
this Welder, with a 15% duty cycle at 110 Amps (setting Max 2), must be al-
lowed to rest for at least 8 minutes and 30 seconds after every minute and 30
seconds of continuous weld at 110 Amps.
(see figure K.)
Failure to carefully observe duty cycle limitations can easily over stress a Welder’s
power generation system, contributing to premature Welder failure.
This Welder is equipped with an internal thermal protection system to help prevent
over stressing the unit. When the unit overheats, it automatically shuts down, then
automatically returns to service when it cools down.
note: Once the unit returns to service, follow a more conservative duty cycle routine to
help prevent excess wear to the Welder. (see figure K.)
1.
2.
3.
4.