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3. 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 metal that is securely
attached to the work piece, but not electrical-
ly 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 auto-
mobile or other equipment with on-board
computer systems, solid state electronic con-
trols, 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 electronic component dam-
age.
OPERATION
Operation of this welder consists of selecting
and adjusting operating controls for optimum
voltage (welding heat) and wire speed settings.
CONTROLS AND INDICATORS
WARNING
Electric shock can kill! Whenever the
POWER switch is in the ON position, the
welding circuit is activated. Under this
condition, an arc will occur if the welding wire
or any part of the welding circuit comes in
contact with welding ground.
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 selec-
tor controls the welding heat. The voltage
selector is lettered A-G. Letter A is the lowest
heat and letter G the highest. Refer to the
label inside the welder door (or on page 32
of this manual) for recommended heat set-
tings for your welding job. Position G on the
Voltage Selector produces the rated output
of 155 amps.
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 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.
Note: The wire will feed faster without an
arc. When an arc is being drawn, the wire
speed will slow down.
SPOT TIMER - This dial controls the length
of time the welder will lay a bead in the spot
mode, with #1 being the shortest and #10
being the longest. Spot Timer functionality is
overridden when dial is turned to the OFF
position.
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 job or whenever
any of the following variables are changed:
heat setting, 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
than 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-
piece farthest away from you, and at an
angle similar to that which will be used
when welding. (See HOLDING THE GUN
on page 18 if you are uncertain of the
angle at which you will be welding)
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