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CAUTION
Remove any packaging material prior to use. Do
not block the air vents at the front or rear of the
Welding Power Source.
NOTE
Consult electrode manufacturer' s information
for correct polarity
7.03 ARC WELDING ELECTRODES
Manual Metal Arc Welding (MMA) electrodes consist of a core
wire surrounded by a flux coating. The flux coating is applied
to the core wire by an extrusion process. The coating on arc
welding electrodes serves a number of purposes:
A.
To provide a gaseous shield for the weld metal, and
preserve it from contamination by the atmosphere whilst
in a molten state.
B.
To give a steady arc by having ' a rc stabilisers' present,
which provide a bridge for current to flow across.
C.
To remove oxygen from the weld metal with ' d eoxidisers'.
D.
To provide a cleansing action on the work piece and a
protective slag cover over the weld metal to prevent the
formation of oxides while the metal is solidifying. The slag
also helps to produce a bead of the desired contour.
E.
To introduce alloys into the weld deposits in special
type electrodes.
Figure 7-5: Setup for MMA (STICK) Welding
7.04 CLASSIFICATION OF ELECTRODES
Arc Welding electrodes are classified into a number of groups
depending on their applications. There are a great number
of electrodes used for specialised industrial purposes which
are not of particular interest for everyday general work.
These include some low hydrogen types for high tensile steel,
cellulose types for welding large diameter pipes, etc.
The range of electrodes dealt with in this publication will cover
the vast majority of applications likely to be encountered;
are all easy to use and all will work on even the most basic of
welding machines
OPERATING MANUAL
For other features
including Settings
refer to Section 7.01
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