Learning To Weld; Holding The Gun - Craftsman 196.205080 Manual De Usuario

4. With your free hand, turn the Wire Speed
Dial to maximum and continue to hold
onto the knob.
WARNING
EXPOSURE TO A WELDING ARC IS
EXTREMELY HARMFUL TO THE EYES
AND SKIN! Prolonged exposure to the
welding arc can cause blindness and burns.
Never strike an arc or begin welding until you
are adequately protected. Wear flameproof
welding gloves, a heavy long sleeved shirt,
cuffless trousers, high topped shoes and a
welding helmet.
5. Lower your welding helmet and pull the
trigger on the gun to start an arc, then
begin to drag the gun toward you while
simultaneously turning the Wire Speed
Dial counter-clockwise.
6. LISTEN! As you decrease the wire
speed, the sound that the arc makes will
change from a sputtering to a high-
pitched buzzing sound and then will
begin sputtering again if you decrease
the wire speed too much. The point on
the wire speed adjustment where the
high-pitched buzzing sound is achieved is
the correct setting.
You can use the wire speed control to slight-
ly increase or decrease the heat and pene-
tration for a given heat setting by selecting
higher or lower wire speed settings. Repeat
this tune-in procedure if you select a new
heat setting, a different diameter wire, or a
different type of welding wire.

LEARNING TO WELD

MIG (Metal Inert Gas) welding is the process
of uniting metallic parts by heating and
allowing the metals to flow together through
the use of an electrical arc. The electrical arc
is created between a continuous consumable
wire electrode (the welding wire) and the
work piece. An inert shielding gas is used to
protect the weld puddle from contamination
and enhance the welding capabilities of the
electrical arc.
18 18
Whether you have welded before or not, it is
important that you become familiar with your
new welder, its controls, and the results
achieved at different settings. We strongly
recommend that you practice with your new
welder on scrap metal trying different heat
settings, base metal thicknesses, and welding
positions for each type and size of wire you
will be using. By doing this you will gain a feel
for how changes in these welding variables
affect the weld.
Of course, if you have not welded before,
you will need to develop welding skills and
techniques as well.
The self-taught welder learns through a
process of trial and error. The best way to
teach yourself how to weld is with short peri-
ods of practice at regular intervals. All prac-
tice welds should be done on scrap metal
that can be discarded. Do not attempt to
make any repairs on valuable equipment
until you have satisfied yourself that your
practice welds are of good appearance and
free of slag or gas inclusions. What you fail
to learn through practice will be learned
through mistakes and re-welds later on.

HOLDING THE GUN

The best way to hold the welding gun is the
way that feels most comfortable to you.
While practicing to use your new welder,
experiment holding the gun in different posi-
tions until you find the one that seems to
work best for you. Refer to WELDING POSI-
TIONS - p.20)
Position the Gun to the Work Piece
There are two angles of the gun nozzle in
relation to the work piece that must be con-
sidered when welding.
1. Angle A (Figure 10) can be varied, but in
most cases the optimum angle will be 60
degrees, the point at which the gun han-
dle is parallel to the work piece. If angle
A is increased, penetration will increase.
If angle A is decreased, penetration will
decrease also.