Welding With Gmaw; Welding With Fcaw; Overload Protection - Lincoln Electric PRO-MIG 175 IM810 Operator's Manual

B-6
The Pro-MIG 175 is suitable for .035" aluminum wire
and .023"– .035" stainless wire. Refer to Table B.1 for
recommended procedure settings. (Requires K586-1
regulator kit and K664-2 Aluminum - Stainless
Feeding Kit.)
CAUTION
It is important when changing between welding
with steel wire and aluminum to exchange feeding
components due to the lubricant applied to steel
wire. Failure to do so may result in contaminated
welds when welding aluminum.
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TABLE B.1 — PR0-MIG 175
WELDING PROCEDURES
Shielding
Process Welding Wire Gas
.035 Dia(0.9mm 100% Argon A-4.5 B-6.5 D-8.5 D-10 E-10 E-10*
4043 Aluminum
Wire
MIG DC+
.030 Dia 98% Argon/ A-3 C-6
308L Stainless 2% Oxygen
Steel Wire
*Test assembly preheated to 250° F.
CHANGING MACHINE OVER TO
FEED OTHER WIRE SIZES
The Pro-MIG 175 is shipped from the factory ready to
feed 0.023" – .025" (0.9 mm) diameter wire. To oper-
ate the Pro-MIG 175 with other sizes of wire, it maybe
necessary to change the contact tip, drive roll and
gun-liner configuration. For component configuration
and placement. Refer to the MAINTENANCE section
on these procedures.
WELDING WITH GMAW (MIG)
Shielding Gas
When using the GMAW process, install the gas regu-
lator and hose.
1. For CO , an optional adjustment is required. Open
2
the cylinder very slowly. For argon-mixed gas,
open cylinder valve slowly a fraction of a turn.
When the cylinder pressure gauge pointer stops
moving, open the valve fully.
2. If using a regulator with an adjustable flow meter,
close the gun trigger and adjust the flow to give 15
– 20 cubic ft per hour (CFH) (7 – 10 I/min) [use 20
– 25 CFH (10 – 12 I/min) when welding out of
position or in a drafty location.
OPERATION
Voltage/Wire Speed
22 ga 16 ga 12 ga 1/8" 3/16" 1/4"
16 ga 14 ga 12 ga 10 ga
D-7.5 D-7.5
Pro-MIG 175
3. Keep the cylinder valve closed, except when using
the Pro-MIG 175. When finished welding:
a) Close the cylinder valve to stop gas flow.
b) Depress the gun trigger briefly to release the
pressure in the gas hose.
c) Turn off the Pro-MIG 175.
WELDING WITH FCAW (Innershield)
When using the FCAW process, the correct drive roll
and electrode polarity must be used. See Work Cable
Installation in INSTALLATION section for changing the
polarity.
Innershield welding kits K549-1 (for .035") and K549-2
(for .045") are also available.

OVERLOAD PROTECTION

Output Overload
The Pro-MIG 175 is equipped with a circuit breaker
which protects the machine from damage if a severe
overload occurs. The circuit breaker button will extend
out when tripped. The circuit breaker must be manual-
ly reset.
Thermal Protection
The Pro-MIG 175 has a rated output duty cycle of
30%. If the duty cycle is exceeded, a thermal protector
will shut off the output until the machine cools to a rea-
sonable operating temperature. This is an automatic
function of the Pro-MIG 175 and does not require user
intervention. The fan continues to run during cooling.
Electronic Wire Drive Motor Protection
The Pro-MIG 175 has built-in protection for wire drive
motor overload.
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