Elite ARC 160 COMPACT Manual De Usuario página 47

MMA Welding
One of the most common types of arc welding is manual metal arc welding (MMA) or stick welding. An electric current is
used to strike an arc between the base material and a consumable electrode rod or 'stick'. The electrode rod is made of a
material that is compatible with the base material being welded and is covered with a flux that gives off gaseous vapours
that serve as a shielding gas and providing a layer of slag, both of which protect the weld area from atmospheric
contamination. The electrode core itself acts as filler material the residue from the flux that forms slag covering over the weld
metal must be chipped away after welding.
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Fuente de alimentación
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• The arc is initiated by momentarily touching the electrode to the base metal.
• The heat of the arc melts the surface of the base metal to form a molten pool at the end of the electrode.
• The melted electrode metal is transferred across the arc into the molten pool and becomes the deposited weld metal.
• The deposit is covered and protected by a slag which comes from the electrode coating.
• The arc and the immediate area are enveloped by an atmosphere of protective gas.
Manual metal arc (stick) electrodes have a solid metal wire core and a flux coating. These electrodes are identified by the
wire diameter and by a series of letters and numbers. The letters and numbers identify the metal alloy and the intended use
of the electrode.
The Metal Wire Core works as conductor of the current that maintains the arc. The core wire melts and is deposited into the
welding pool.
The covering on a shielded metal arc welding electrode is called Flux.
The flux on the electrode performs many different functions.
These include:
• producing a protective gas around the weld area
KEEP WORKiNG KEEP WORKiNG
Keep Working
Núcleo
Recubrimiento fundente
Gas protector
Arco con núcleo de
alambre fundido
Residuos de fundente que forman capa de escoria
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S i 6 1 6 0 m D v
Metal de soldadura
Pieza de trabajo