OPERATION
additional functions are provided mainly by the covering on the electrode.
§4.2.4 Stick（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 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 base on using 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 astable 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
AverageThickness
of Material
MaximumRecommended
Electrode Diameter
To Next Page
Loading...