PRO-POINT 9085986 Mode D'emploi page 23

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6. Hold the electrode slightly above the workpiece to maintain the arc while
travelling at an even speed to create an even weld deposit (Fig. 6)
7. To finish the weld, break the arc by quickly snapping the electrode away
from the workpiece (Fig. 7).
8. Wait for the weld to cool and carefully chip away the slag to reveal the
weld metal underneath (Fig. 8).
MMA (STICK) WELDING FUNDAMENTALS
ELECTRODE SELECTION
As a general rule, the selection of an electrode is straight forward, in that it is only
a matter of selecting an electrode of similar composition to the parent metal.
However, for some metals there is a choice of several electrodes, each of which
has particular properties to suit specific classes of work. It is recommended to
consult your welding supplier for the correct selection of electrode.
ELECTRODE SIZE
The size of the electrode generally depends on the thickness of the section being
welded and the thicker the section the larger the electrode required. The table
gives the maximum size of electrodes that maybe used for various thicknesses of
section based on using a general-purpose type 6013 electrode (See Table 2).
WELDING CURRENT (AMPERAGE)
Correct current selection for a particular job is an important factor in arc
welding. Current that is too low will make it difficult to strike and maintain a
stable arc. The electrode tends to stick to the work, penetration is poor and the
electrode will deposit a round weld bead.
A current that is too high overheats the electrode, resulting in an undercut or
burning through of the base metal and producing excessive spatter.
The table shows current ranges generally recommended for a general-purpose
type 6013 electrode (see Table 3).
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AC/DC Inverter TIG/Arc Welder
Fig. 6
Fig. 7
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Fig. 8
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