ATD Tools ATD-3130, Operating Manual, Page: 12 / 36

12
pushing upwards. (Alignment of the sec-
ond tab is made easier by applying pres-
sure to the point shown below.)
3. Once the handle tabs are properly seat-
ed in the face shield slots, install the
handle cover by
pushing it into the
recessed area on the face shield.
4. Install the dark glass by sliding it into
place behind the glass retaining tabs.
Note: if your face shield was supplied with a
3” x 3.8” dark glass you may choose to
remove the extra material from the face
shield to allow a larger
of vision when
welding. To remove the extra material,
remove the glass from the face shield and
carefully cut the material out of the face
shield with a utility knife.
5. Once protective dark glass has been
installed into face shield, secure it in
place with the retaining clips. Align the
holes on each of the retaining clips with
the pins on the retaining tabs and
press into place.
INSTALLING THE HANDLE
1. Insert the tabs of the welder handle into
the slots provided on the top of the welder.
2. Insert a large head screw (included
in the accessories bag) into each hole on
the top of the welder handle.
3. With a tip screwdriver, securely tight-
en both screws. (see Figure 3)
SELECTING SHIELDING GAS
The shielding gas plays an extremely impor-
tant role in the MIG welding process. It is crit-
ical that the molten weld puddle be shielded
from the atmosphere. The shielding gas cre-
ates a protective pocket around the weld pud-
dle which keeps impurities in the air from con-
taminating the weld. Inadequate shielding will
result in porous, brittle welds.
Although there are many gasses and gas mix-
tures available for MIG welding, the following
recommendations are based on the electrical
output characteristics and metal thickness
capabilities of this s
MIG welder.
Gas Selection For Steel Welding With
Steel Wire
For either mild or low carbon (High Strength
Structural) steel, use a gas mixture of 75%
Argon and 25% Carbon Dioxide. DO NOT
USE Argon gas concentrations higher than
75% on steel. The result will be extremely poor
penetration, porosity, and brittleness of weld.
This gas mixture helps to prevent burn
through and distortion on very thin steel yet
provides good penetration on thicker steel. Its
ability to minimize spatter results in clean,
smooth weld appearances. In addition, it pro-
vides good puddle control when welding ver-
tically or overhead.
Gas Selection For Stainless Steel Welding
Thebestshieldinggasforstainlesssteelweldingis
a mixture of 90% Helium, 7.5% Argon, and 2.5%
Carbon Dioxide. However, the 100% Argon, can
also be used, but an increase in the area being
heated by the arc will be experienced causing
slightly greater distortion of the base metal.
Gas Selection For Steel Welding With
Silicon Bronze Wire
Use only pure Argon when welding steel with
Silicon-Bronze wire.
Figure 2. Face Shield Assembly
Face Shield
Handle
Handle
Cover
Retaining
Tabs
Retaining
Clip
Retaining
Clip
Dark
Glass
Extra
Material
Figure 3. Handle Installation