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AUTOPRO 155S
MAKING A WELd
Insert the bare part of the electrode into the electrode holder jaws
and connect the work clamp to the welding piece. Make sure to
have good electrical contact.
1. Turn the welder on.
2. Lower your welding helmet to protect your face and eyes.
3. Strike the electrode at the work point on the workpiece as if
striking a match. Do not hit the electrode on the workpiece,
which will damage the stick electrode and make striking an
arc difficult. Scratch the electrode slowly over the metal and
you will see sparks. While scratching, lift the electrode 1/8"
(3.2mm) and the arc will establish.
NOTE: If you stop moving the electrode while scratching, the
electrode will stick.
NOTE: Most beginners try to strike the arc by a fast jabbing motion
down on the plate. Result: They either stick or their motion
is so fast that they break the arc immediately.
4. Immediately after striking the arc try to maintain a distance
from the workpiece that is equivalent to the diameter of the
electrode used. Maintain this distance as constantly as
possible during the weld. Whenever possible, weld from left
to right (if right-handed). Hold the electrode at a slight angle
FIGURE B.5
as shown. (See Figure B.5)
5. As the electrode burns off the electrode must be fed to the
work to maintain correct arc length. The easiest way to tell
whether the arc has the correct length is by listening to its
sound. A nice, short arc has a distinctive, "crackling" sound,
very much like eggs frying in a pan. The incorrect, long arc
has a hollow, blowing or hissing sound.
6. The important thing to watch while welding is the puddle of
molten metal right behind the arc. Do NOT watch the arc
itself. It is the appearance of the puddle and the ridge where
the molten puddle solidifies that indicate correct welding
speed. The ridge should be approximately 3/8" (9.5mm)
FIGURE B.6
behind the electrode. (See Figure B.6)
Most beginners tend to weld too fast, resulting in a thin, uneven,
"wormy" looking bead. They are not watching the molten metal.
IMPORTANT: For general welding it is not necessary to weave the
arc; neither forwards and backwards nor sideways. Weld
along at a steady pace. You will find it easier. NOTE: When
welding on thin plate, you will find that you will have to
increase the welding speed, whereas when welding on heavy
plate, it is necessary to go more slowly in order to get good
penetration.
7. Once the electrode is burned down move the electrode
quickly from the weld to extinguish the arc.
8. Turn the machine off and remove the stub by opening the
jaws of the electrode holder and insert a new electrode.
Note: The welded work piece and electrode stub are hot after
welding. Allow them to cool down before touching or use
pliers to move. Always make sure the welder is turned off
before setting down the Electrode Holder.
B-4
OPERATION
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