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Assembly
(Continued)
9. Carefully slip contact tip over wire
and screw tip into torch end. Install
nozzle by twisting clockwise while
pushing onto torch (See Figure 5).
Cut wire off approximately 1/4 inch
from nozzle end.
Nozzle
Contact Tip
Figure 5 - Torch Nozzle
Contact Tip Markings
Mark
Wire Size
0.6 mm
0.8 mm
0.9 mm
DUTY CYCLE / THERMOSTATIC
PROTECTION
Welder duty cycle is the percentage of
actual weld time that can occur in a ten
minute interval. For example, at a 10%
duty cycle, actual welding can occur for
one minute, then the welder must cool
for nine minutes.
Internal components of this welder are
protected from overheating with an
automatic thermal switch. A yellow
lamp is illuminated on the front
panel (on/off switch) if the duty cycle
is exceeded. Welding operations may
continue when the yellow lamp is no
longer illuminated.
POLARITY
To change between flux wire and MIG
wire the polarity must be changed.
1. Remove the wire feed door.
2. Locate red (+) and black (-) polarity
connectors just below wire feed
mechanism (See Figure 6).
3. For MIG welding with gas,
Connect torch cable from wire feed
mechanism to red (+) polarity
connector then connect work cable
to black (-) connector.
Torch Work
Mig
+
Flux
—
Torch neck
Figure 6 - Cable connection
4. For flux-core welding, connect
torch cable from wire feed
mechanism to black (-) polarity
connector then connect work cable
.024"
to red (+) connector.
.030"
Shielding Gas Preparation
.035"
compressed gas cylinders and regulators
can result in serious injury or death!
Always secure gas cylinders to tank
bracket kit, a wall or other fixed support
to prevent cylinder from falling over.
Read, understand and follow all
compressed gas and equipment
warnings in the safety instructions.
NOTE: Shielding gas is not required if
flux-cored welding wire is used.
GAS TYPES
There are 3 types of gas generally used
for gas metal arc welding; 100% argon,
Figure 7 - Hookup
—
+
Torch Cable
Work Cable
Improper handling
and maintenance of
Hose
Clamp
5
Model WG2020
a mixture of 75% argon and 25%
carbon dioxide (C25) or 100% carbon
dioxide. The 75/25 mixture is
recommended for general steel welding.
For aluminum welding, use 100% argon.
Cylinders of either type gas may be
obtained at your local welding supply
outlet. Secure cylinder in place on your
welding machine or other support to
prevent the cylinder from falling over.
REGULATOR
The regulator provides a constant
shielding gas pressure and flow rate
during the welding process. Each
regulator is designed to be used with a
specific gas or mixture of gases. The
argon and argon mixture use the same
thread type. The 100% carbon dioxide
uses a different thread type. An adapter
is available at your local welding gas
supplier to change between the two.
HOOKUP PROCEDURE
Cylinder gas is under
high pressure. Point
cylinder outlet away
from yourself and any
bystanders before
opening.
1. With cylinder securely installed, stand
on side of cylinder opposite cylinder
outlet then remove cylinder cap and
open valve slightly by turning
counterclockwise. When gas is
emitted from cylinder, close valve by
turning clockwise. This will blow out
Cap
ARGON OR
ARGON MIX
INSTALLATION
OR
OR
INSTALLATION
CO
Adapter
2
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