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Parts & Service: 020 8988 7400 / E-mail: [email protected] or [email protected]
OPERATING THE WELDER (MMA/ARC)
The consumable electrode is connected to a high amperage low voltage
supply which creates an electric arc between the electrode and the
workpiece.
The most difficult aspect of the arc welding process, particularly for beginners,
is that of striking an arc. We strongly recommend that you practice on some
pieces of scrap metal to get the feel of the operation before you start an
actual welding job.
1. Holding the welding mask close-up to your face, give a short stroke with
the electrode on the workpiece. As soon as the arc is primed, withdraw the
electrode from the workpiece to leave a gap. The current will flow across
the gap with a crackling noise and a brilliant arc. Continue to weld in one
direction, maintaining the small gap as you go.
2. As soon as the arc is struck, maintain a distance from the workpiece equal
to the diameter of the electrode. Keep this distance as constant as
possible for the duration of the weld. As you advance along the workpiece
the angle of the electrode must be maintained at between 20º and 30º.
NOTE:
When you prime the arc be sure to withdraw the electrode swiftly
to leave the gap, otherwise the electrode will weld itself to the
workpiece. If this occurs give the electrode a short sharp jerk to
free it and, if necessary, prime the arc again. If you cannot free
the electrode, switch the machine off immediately and free it.
Take care the electrode will get red hot very quickly and will be
capable of burning through welding gloves.
3. At the finish of the weld, bring the end of the electrode backward in order
to fill the weld crater and then quickly lift the electrode from the weld pool
to extinguish the arc.
4. Inspect the job carefully. Any slag forming on the surface should be
chipped away with a chipping hammer or pick. ALWAYS wear your safety
goggles when chipping away slag.
WARNING: WHEN WELDING ALWAYS ENSURE THERE IS ADEQUATE
VENTILATION IN THE WORK AREA DUE TO TOXIC FUMES.
WARNING: DO NOT STRIKE THE ELECTRODE ON THE WORKPIECE, AS THIS
MAY DAMAGE THE ELECTRODE.
WARNING: WELDING ARCS PRODUCE HARMFUL UV/IR LIGHT WHICH CAN
SERIOUSLY DAMAGE YOUR EYES. ALWAYS USE A WELDING FACE-SHIELD
WITH A SUITABLE FILTER THAT CONFORMS TO CURRENT STANDARDS.
WARNING: PROTECT BYSTANDERS BY USING WELDING SCREENS.
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