Harbor Freight Tools DUAL MIG 93793 - Manual (Page 17)

Page 17 For technical questions, please call 1-800-444-3353. SKU 93793
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. Additional 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! 1. Avoid damage to the Welder by not leaving the unit on for more than the
prescribed duty cycle time.
The duty cycle defines the number of minutes, within a 10 minute period, during which a
2.
given Welder can safely produce a particular welding current. For example, this Welder,
with a 18% duty cycle at 140 amps (setting 6), must be allowed to rest for at least 8
minutes and 12 seconds after every minute and 48 seconds of continuous weld at
140 amps.
(See Figure K.)
Failure to carefully observe duty cycle limitations can easily over stress a Welder’s power
3.
generation system, contributing to premature Welder failure.
This Welder is equipped with an internal thermal protection system to help prevent
4.
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
5
6
Switch Settings
a
mperage
0
25
50
75
100
125
150
0 10 20 30 40 50 60 70 80 90 100
Duration of use
FIGure K