Lincoln Electric IM789 WELDMARK 135 PLUS - Manual (Page 19)

B-6 B-6 OPERATION
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
welder.
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 WELDMARK 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
2
gas or an argon-CO
2
blended
gas (75 to 80% argon and 25 to 20% CO
2
) and .025"
(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)].
The WELDMARK 135 PLUS is suitable for .035"
Aluminum wire and .030" stainless wire. Refer to
Table B.1 for Recommended Procedure Settings.
Aluminum wire requires K663-2 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.
------------------------------------------------------------------------
TABLE B.1-- WELDMARK135 PLUS Welding
Procedures
NR (Not Recommended)
* Test assembly preheated to 250 ° F.
CHANGING MACHINE OVER TO
FEED OTHER WIRE SIZES
The WELDMARK135 PLUS is shipped from the facto-
ry ready to feed 0.023-0.025
” (0,6 mm) diameter wire.
To operate the welder 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 MAIN-
TENANCE section, for specific information on these
procedures.
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.
OVERLOAD PROTECTION
Output Overload
The WELDMARK 135 PLUS is equipped with a circuit
breaker which protects the machine from potential
damage from excessive output current. The circuit
breaker button will extend out when tripped. The cir-
cuit breaker must be manually reset.
WARNING
Use of the GMAW process with the WELDMARK
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
failure.
CAUTION
WELDMARK 135 PLUS
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 C-5 E-8.5 H-10 J-10* NR NR
4043 Aluminum
Wire
MIG DC+
18 ga 16 ga 14 ga 12 ga 10 ga
.030 Dia 98% Argon/ D-3 E-4.5 F-6 H-8 NR
308L Stainless 2% Oxygen
Steel Wire