Operating Instructions and Parts Manual
Metal man Industrial Welder
13
MIG 135
MIG WELDER
5. Gas
hose
6. Gas
cylinder
NOTE:
Slowly open the cylinder valve by
turning it counterclockwise until the
cylinder pressure gauge registers the
cylinder pressure. Turn the
adjustment knob clockwise slowly to
increase gas flow to 20 cfm. To
reduce the gas flow turn the
adjustment counterclockwise. The
gas solenoid valve is on the back
panel of the welder. Gas flow can be
heard at the end of the gun when the
trigger is activated. No gas flow will
result in a harsh arc with excessive
spatter, a smooth weld bead will not
be obtained.
3. Gas
selection.
Different materials require different
shielding gas when MIG welding,
refer to the set up chart inside the
wire feed compartment also.
Mild steel
: Use 75% Argon and 25%
for reduced spatter and reduced
penetration for thinner materials. Do
NOT USE Argon gas concentrations
higher than 75% on steel. The result
will be extremely poor penetration,
porosity, and brittleness of weld.
Mild Steel
: Use CO2 for deeper
penetration but increased spatter.
Stainless steel
: Use a mixed gas
consisting of Helium, Argon and CO2.
Aluminum or bronze
: Use 100%
Argon
Operation
High voltage danger from power
source! Consult a qualified
electrician for proper installation of
receptacle at the power source.
This welder must be grounded
while in use to protect the operator
from electrical shock. If you are
not sure if your outlet is properly
grounded, have it checked by a
qualified electrician. Do not cut off
the grounding prong or alter the
plug in any way and do not use
any adapters between the welder’s
power cord and the power source
receptacle. Make sure the POWER
switch is OFF then connect your
welder’s power cord to a properly
grounded 115 VAC(110v-120v),
60Hz, single phase, 50 amp power
source.
1. Main control component
Power switch
- The power switch
supplies electrical current to the
welder. Whenever the power switch is
in the ON position, the welding circuit
is activated. ALWAYS turn the power
switch to the OFF position and unplug
the welder before performing any
maintenance.
Voltage selector
- The voltage
selector controls the welding
voltage/heat. This unit has a five step
voltage control. Refer to the label
inside the welder side door for
recommended voltage selector
settings for your welding job.
Wire speed control
- The wire speed
control adjusts the speed at which the
wire is fed out of the MIG gun. The
wire speed needs to be closely
matched (tuned-in) to the rate at
which it is being melted off. Some
things that affect wire speed selection
are the type and diameter of the wire
being used, the heat setting selected,
and the welding position to be used.
