Lincoln Electric IM726 SP-175T - Manual (Page 19)

B-6
SP-175T
B-6 OPERATION
The SP-175T is suitable for .035" aluminum wire and
.023"
– .035" stainless wire. Refer to Table B.1 for rec-
ommended procedure settings. (Requires K1799-1
Argon regulator kit and K664-2 Aluminum - Stainless
Feeding Kit.)
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 — SP-175T
WELDING PROCEDURES
CHANGING MACHINE OVER TO
FEED OTHER WIRE SIZES
The SP-175T is shipped from the factory ready to feed
0.023
” – .025" (0.9 mm) diameter wire. To operate the
SP-175T with other sizes of wire, it is necessary to
change the contact tip and change the drive roll over
to other sizes. Refer to Changing the Contact Tip and
Changing the Drive Roll, in the MAINTENANCE sec-
tion, for specific information on these procedures.
WELDING WITH GMAW (MIG)
Shielding Gas
When using the GMAW process, obtain and install a
gas regulator and hose kit K1800-1 (for CO
2
) or a
K1799-1 (Argon-mixed) gas regulator and hose kit.
1. For CO
2
, open 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.
3. Keep the cylinder valve closed, except when using
the SP-175T. 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 SP-175T.
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 SP-175T is equipped with a circuit breaker which
protects the machine from damage if a severe over-
load occurs. The circuit breaker button will extend out
when tripped. The circuit breaker must be manually
reset.
Thermal Protection
The SP-175T 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 reason-
able operating temperature. This is an automatic func-
tion of the SP-175T and does not require user inter-
vention. The fan continues to run during cooling.
Electronic Wire Drive Motor Protection
The SP-175T has built-in protection for wire drive
motor overload.
Shielding Voltage/Wire Speed
Process Welding Wire Gas 16 ga 14 ga 12 ga 10 ga 3/16
MIG DC+ .035 Dia 100% Argon A-5 B6.5 C-8 D-8.5 E-10
4043/5356
Aluminum Wire
MIG DC+ .023 Dia 98% Argon/ A-4 B-6 C-8 — —
308L Stainless 2% Oxygen
Steel Wire
MIG DC+ .030 Dia 98% Argon/ B-3.5 C-6.5 D-7 E-8 E-9
308L Stainless 2% Oxygen
Steel Wire
MIG DC+ .035 Dia 98% Argon/ B-2.5 C-4 D-6 E-8 E-8
308L Stainless 2% Oxygen
Steel Wire
CAUTION