Lincoln Electric IM795 - Manual (Page 21)

B-6
SP 170-I
B-6
OPERATION
The SP 170-I is suitable for .035" (0.9 mm) aluminum
wire and .023"
– .035" (0.6 - 0.9 mm) stainless wire.
Refer to Table B.1 for Recommended Procedure
Settings. Aluminum wire requires an Aluminum
Welding kit. See ACCESSORIES section.
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 170-I
WELDING PROCEDURES
CHANGING MACHINE OVER TO
FEED OTHER WIRE SIZES
The SP 170-I is shipped from the factory ready to feed
0.035" (0.9 mm) Innershield diameter wire. To operate
the SP 170-I with other sizes of wire, it maybe neces-
sary 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 MAINTE-
NANCE section, for specific information on these pro-
cedures.
WELDING WITH GMAW (MIG)
Shielding Gas
When using the GMAW process, obtain and install a
gas regulator and hose kit. If using 100% CO
2
a CO
2
adapter is required, sold separately.
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 170-I. 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 170-I.
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 170-I 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 170-I 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 170-I and does not require user inter-
vention. The fan continues to run during cooling.
Electronic Wire Drive Motor Protection
The SP 170-I has built-in protection for wire drive
motor overload.
CAUTION
Shielding Voltage/Wire Speed
Process Welding Wire Gas 22 ga 16 ga 12 ga 1/8 ” 3/16 ” 1/4 ”
.035 Dia(0.9mm 100% Argon B-5 B-7 E-9 G-9 I-9 J-10*
4043 Aluminum
Wire
MIG DC+
16 ga 14 ga 12 ga 10 ga
.030 Dia 98% Argon/ A-3 C-6 D-7.5 D-7.5
308L Stainless 2% Oxygen
Steel Wire