17
B. For MIG (GMAW) welding, mount the
Ground Clamp ring terminal to the (-)
mounting post and the Torch ring
terminal to the (+) mounting post.
See conguration shown in Figure 9.
2. Attach the ground clamp to the work
piece, making sure that it is cleaned of
dirt, oil, rust, scale, oxidation, and paint
at the point of connection.
Note: It is best to connect the ground clamp
directly to the work piece and as close to the
weld as possible. If it is impractical to con-
nect the ground clamp directly to the work
piece, connect it to the metal that is secure-
ly attached to the work piece, but not elec-
trically insulated from it. Make certain this
other metal is of equal or greater thickness
than that of the workpiece.
CAUTION
Risk of electric component damage! If
the ground clamp is being connected to an
automobile or other equipment with on-
board computer systems, solid state elec-
tronic controls, solid state sound systems,
etc., do not weld until disconnecting the
battery that is attached to the chassis
ground. Failure to do so may result in elec-
tronic component damage.
Operation of this welder consists of selecting
and adjusting operating controls for opti-
mum voltage (welding heat) and wire
speed
settings.
Operation of this welder consists of selecting
and adjusting operating controls for optimum
voltage (welding heat) and wire speed settings.
CONTROLS AND IND ICATORS
POWER SWITCH - The power switch sup-
plies electrical current to the welder.
ALWAYS turn the power switch to the OFF
position and unplug the welder before per-
forming any maintenance.
VOLTAGE SELECTOR - The voltage selector
switch and dial control the welding heat. The
voltage selector switch is label MIN/MAX,
referring to minimum and maximum voltage
output. The voltage selector dial is num-
bered 1-3. Number 1 is the lowest heat and
number 3 is the highest. Refer to the label
under the welder hood (or on page 33 of
this manual) for recommended heat settings
for your welding job.
WIRE SPEED CONTROL - The wire speed
control adjusts the speed at which the wire is
fed out of the welding gun. The wire speed
needs to be closely matched (tuned-in) to
the rate at which it is being melted o. Some
things that aect wire speed selection are
the type and diameter of the wire being
used,
the heat setting selected, and the
welding position to be used.
Note: The wire will feed faster without an
arc. When an arc is being drawn, the wire
speed will slow down.
TUNING IN THE WIRE SPEED
This is one of the most important parts of MIG
welder operation and must be done before
starting each welding jobor whenever any of
the following variables are changed: heat set-
ting wire diameter, or wire type.
1. Set up and ground a scrap piece of the
same type of material which you will be
welding. It should be equal to or greater
that the thickness of the actual work piece,
and free of oil, paint, rust, etc.
2. Select a heat setting.
3. Hold the gun in one hand, allowing the
nozzle to rest on the edge of the work-
OPERATION
Figure 9. Changing Polarity
