26
GALAXY 3000 GE MV VRD
EN
3.3. WELDING WITH COATED ELECTRODE.
Electric arc welding with coated electrode is a process whereby the metal between the part and a coated
metal electrode is melted . The coating protects the inside of the electrode until the melting moment. With the
heat of the arc, the end of the electrode melts and burns the coating, thus obtaining the appropriate
atmosphere to transfer the molten metal from the core of the electrode to the melt bath in the base material.
These drops of molten metal fall coated with molten
slag from the melting of the arc coating. The slag floats
on the surface and forms a protective layer for the
molten metal above the welding bead.
Especially recommended for repair and maintenance
welding, manufacture and installation of pipes, as well
as outdoor assembly work.
When welding with coated electrode we must connect
the electrode-holder clamp ("U") and the earth clamp
("T") according to the polarity advised by the electrode
manufacturer.
Installation for COATED ELECTRODE welding.
G
F
T
U
G
F
T
U
Welding process selector ("J").
ELECTRODE MODE.
In this
mode, the HOT START, ARC
FORCE, and ANTI-STICKING
functions will be available.
Electrode welding is easier and
more effective using these.
Normally, the majority of the electrodes must be placed with straight polarity; that is, the welding electrode-
holder clamp in the negative pole and the earth clamp in the positive pole. However, welding with basic or
special electrodes is usually carried out with reverse polarity; that is, the electrode-holder clamp in positive
pole and the earth clamp in negative pole. We will follow the electrode manufacturer's instructions in each
case. Equipment preparation for the working mode is drawn in the figure; in this case, observe that the
polarity used is inverse, meaning that the welding electrode-holder is connected to the positive pole.
