Lincoln Electric SP-135 PLUS IM725 Operator's Manual page 19

B-6
9. To stop welding, release the gun trigger and then
pull the gun away from the work after the arc goes
out.
10. When no more welding is to be done, close valve
on gas cylinder (if used), momentarily operate gun
trigger to release gas pressure, and turn off the
SP-135 PLUS.
Cleaning Tip And Nozzle
Clean the contact tip and nozzle to avoid arc bridging
between the nozzle and contact tip which can result in
a shorted nozzle, poor welds and an overheated gun.
Hint: Anti-stick spray or gel, available from a welding
supply distributor, may reduce buildup and aid in spat-
ter removal.
PROCESS GUIDELINES
The SP-135 PLUS can be used for welding mild steel
using the GMAW, single pass, process which requires
a supply of shielding gas or it can be used for the self
shielded,Innershield ® process (FCAW).
The recommended gases and electrodes for GMAW
are welding grade CO gas or an argon-CO
2
gas (75 to 80% argon and 25 to 20% CO
(0.6 mm) diameter Lincoln L-56 mild-steel welding
wire, supplied on 12-1/2 lb (5.7 kg) spools.
The recommended electrode for the self-shielded
process is 0.035" (0,9 mm) diameter Lincoln
Innershield NR-211-MP on 10 Ib (4,5 kg) spools. This
electrode can be used for all position welding of 20
gauge through 5/16" (1,0 – 8,0 mm) thick steel [multi-
ple passes are required for 1/4" and 5/16" (6,0 and 8,0
mm)].
WARNING
Use of the GMAW process with the SP-135 PLUS
on thicker materials than recommended may
result in poor welds. The welds may "look" good,
but may just be "sitting" on top of the plate. This
is called "cold casting" and will result in weld fail-
ure.
The SP-135 PLUS is suitable for .035" Aluminum wire
and .030" stainless wire. Refer to Table B.1 for
Recommended Procedure Settings. Aluminum wire
requires K663-1 Aluminum Welding kit. See ACCES-
SORIES section.
OPERATION
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.
------------------------------------------------------------------------
TABLE B.1 — SP-135 PLUS Welding Procedures
Process
MIG DC+ .035 Dia
MIG DC+ .035 Dia
MIG DC+ .030 Dia
CHANGING MACHINE OVER TO
FEED OTHER WIRE SIZES
The SP-135 PLUS is shipped from the factory ready to
feed 0.023-0.025" (0,6 mm) diameter wire. To operate
blended
2
the SP-135 PLUS with other sizes of wire, it is neces-
) and .025"
2
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 FCAW (Innershield)
Welding with Innershield requires an Innershield
Welding Kit. A gasless nozzle is provided in the
Innershield Welding Kit. When using Innershield elec-
trode, installing the gasless nozzle will improve visibili-
ty of the arc and protect the gas diffuser from weld
spatter. Additionally included is a gun cable liner to
permit proper feeding of .035" (0,9 mm) Innershield
wire. Refer to the ACCESSORIES section for details
on obtaining this kit.
SP-135 PLUS
CAUTION
Welding Shielding
Wire Gas 16 ga 14 ga 12 ga 10 ga
100% Argon D-4.5 H-6.5 H-6.5 J-7.5
4043 Aluminum
Wire
100% Argon C-5.5 D-6
5356 Aluminum
Wire
98% Argon/ D-3
308L Stainless 2% Oxygen
Steel Wire
B-6
G-8.5 H-9.5
F-4 J-5 J-6.5