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additional functions are provided mainly by the various coverings on the electrode.
4.1.3 MMA 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 recommend to consult your welding supplier.
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 maximum size of electrodes that may
be used for various thicknesses based on a general
purpose type 6013 electrode.
Welding Current (Amperage)
Correct current selection for a particular job is an
important factor in arc welding. With the current
set too low, difficulty is experienced in striking and
maintaining a stable arc. The electrode tends to
stick to the work, penetration is poor and beads
with a distinct rounded profile will be deposited.
Too high current is accompanied by overheating
of the electrode resulting undercut and burning through of the base metal and producing
excessive spatter. Normal current for a particular job may be considered as the maximum, which
can be used without burning through the work, over-heating the electrode or producing a rough
spattered surface. The table shows current ranges generally recommended for a general
purpose type 6013 electrode.
Average Thickness of
Material
Max Recommended
Electrode Diameter
1.0-2.0 mm
2.5 mm
2.0-5.0 mm
3.2 mm
5.0-8.0 mm
4.0 mm
>8.0 mm
5.0 mm
Electrode Size
ø mm
Current Range
(Amps)
2.5 mm
60-95
3.2 mm
100-130
4.0 mm
130-165
5.0 mm
165-260
21
Summary of Contents for 800MLTG2400PFC
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