9
ARC 200
Northern Industrial Welder
Operating Instructions and Parts Manual
The best way to teach yourself how to
weld is with short periods of practice
at regular intervals. All practice 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.
2.1Holding the electrode
The best way to grip the electrode
holder is the way that feels most
comfortable to you. Position the
Electrode to the work piece when
striking the initial arc it may be
necessary to hold the electrode
perpendicular to the work piece.
Once the arc is started the angle of
the electrode in relation to the work
piece should be between 10 and 30
degrees. This will allow for good
penetration, with minimal spatter.
2.2 Striking the arc
EXPOSURE TO A WELDING ARC
IS EXTREMELY HARMFUL TO THE
EYES AND SKIN.
• Never strike an arc or begin
welding until you have adequate
protection.
• Wear flameproof welding gloves,
heavy long-sleeved shirt, cuffless
trousers, high-topped shoes and a
welding helmet or shield.
Scratch the work piece with the end
of electrode to start arc and then
raise it quickly about 1/8 inch gap
between the rod and the work piece,
see following picture
It is important that the gap be
maintained during the welding
process and it should be neither too
wide or t0o narrow. If too narrow, the
rod will stick to the work piece. If too
wide, the arc will be extinguished.
It needs much practice to maintain
the gap. The beginners may usually
get sticker or arc extinguishing. When
the rod is stick to the work piece,
gently rock it back and forth to make
them separate. If not, the circuit is
short connection, it will break the
welder.
A good arc is accompanied by a crisp,
cracking sound. The sound is similar
to that made by eggs frying. To lay a
weld bead, only 2 movements are
required; downward and in the
direction the wel
d is to be
laid, as in
following figure:
2.3 Types of weld bead
The following paragraphs discuss the
most commonly used arc welding
beads.
The stringer bead
Formed by
traveling with the torch in a straight
line while keeping the wire and nozzle
centered over the weld joint.
The weave bead
Used when you
want to deposit metal over a wider
space than would be possible with a
stringer bead. It is made by weaving
