Selecting Shielding Gas - Clarke HOT SHOT SPOOL GUN WELDER FLUXCORE/MIG 135SG Mode D'emploi

the Torch Wire should exit the junction
box at the bottom.
Figure 6. Junction Box
6. Replace the Junction Box cover and
tighten the three screws.
7. Plug the Power Coupler into the Power
Supply Port. The coupler will fit into the
port only one way. If it does not fit, rotate
the coupler 180 degrees and try again.
Do not try to force the coupler into the
port.
8. Remove the retaining knob from the
mounting post on the Polarity Block.
Place the Torch Wire ring terminal onto
the mounting post. Replace the retaining
knob and hand tighten. See CHANGE
POLARITY section on page 16 of this
manual for correct polarity settings for
gas and no-gas welding.
9. Feed the Gas Hose through the eyelets,
which are stamped into the welder's
Dividing Panel, and back towards the
Fast Coupler Fitting at the rear of the
welder. (See Figure 7)
Figure 7. Torch Connections
10. Firmly push the end of the Gas Hose into
the Fast Coupler Fitting. Pull back on the
Gas Hose to make sure that it is locked
into the Fast Coupler Fitting.
11. Verify that all connections are in place. If
12
so, Torch Installation is complete and you
may close the welder's side door.

SELECTING SHIELDING GAS

The shielding gas plays an extremely
important role in the MIG welding process. It
is critical that the molten weld puddle be
shielded from the atmosphere. The shielding
gas creates a protective pocket around the
weld puddle which keeps impurities in the air
from infecting the weld. Inadequate shielding
will result in porous, brittle welds.
Although there are many gasses and gas
mixtures available for MIG welding, the
following recommendations are based on the
electrical output characteristics and metal
thickness capabilities of this specific
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
provides good puddle control when welding
vertically or overhead.
Gas Selection For Stainless Steel Welding
The best shielding gas for stainless steel
welding is a mixture of 90% Helium, 7.5%
Argon, and 2.5% Carbon Dioxide. However,
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.
Gas Selection For Aluminum Welding
with Aluminum Wire
Use only pure Argon when welding aluminum.