Lincoln Electric IM724 SP-135T - Manual (Page 19)

B-6 OPERATION B-6
The SP-135T is suitable for .035" aluminum wire and
.030" stainless wire. Refer to Table B.1 for recom-
mended procedure settings (requires K499 Argon
Regulator Kit).
TABLE B.1
CHANGING MACHINE OVER TO
FEED OTHER WIRE SIZES
The SP-135T is shipped from the factory ready to feed
.023
” -.025 ” (0.6 mm) diameter wire. To operate the
SP-135T 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; K463 (for CO2) or K499
(Argon mixed) gas regulator and hose kit.
1. For CO2, 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 for CO2]. For argon
mixed gas, trigger to release gas pressure, and
adjust the flow to give 25 – 30 CFH (12 – 14
I/min).
3. Keep the cylinder valve closed, except when using
the SP-135T. 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-135T.
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 kit K549-1 (for .035" / 0.9mm) is
also available.
OVERLOAD PROTECTION
Output Overload
The SP-135T is equipped with a circuit breaker and a
thermostat which protects the machine from damage if
maximum output is exceeded. The circuit breaker but-
ton will extend out when tripped. The circuit breaker
must be manually reset.
Thermal Protection
The SP-135T has a rated output duty cycle of 20%. 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-135T and does not require user inter-
vention. The fan continues to run during cooling.
Electronic Wire Drive Motor Protection
The SP-135T has built-in protection for wire drive
motor overload.
SP-135T
Shielding Voltage/Wire Speed
Process Welding Wire Gas 16 ga 14 ga 12 ga 10 ga
MIG DC+ .035 Dia 100% Argon B-5 D-7 D-9 D-9
4043 Aluminum
Wire
MIG DC+ .035 Dia 100% Argon B-5 C-7 D-9 D-10
5356 Aluminum
Wire
MIG DC+ .030 Dia 98% Argon/ A-3 C-6 D-7.5 D-7.5
308L Stainless 2% Oxygen
Steel Wire