Mig/Mag Welding, Conventional Welding; Pulse Welding; Dual Pulse Welding; Electrode Welding - REHM MEGAPULS 250 Betriebsanleitung

Functional description

3.4.1 MIG/MAG welding, conventional welding

When carrying out conventional MIG/MAG welding, the burning wire electrode is
the welding material and the arc carrier. The wire electrode is wound by a feed
motor from a spool and pushed through the torch package to the current nozzle.
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The wire electrode and the pool crater are protected from the oxygen in the air by
the inert gas that is released from the nozzle arranged concentrically around the
electrode. The stability of the welding weld metal is maintained as a result.

3.4.2 Pulse welding

When pulse welding, the short high current phases mean that droplets are
transferred from the additional material without short circuiting. In this way, a
spatter-free material transfer is achieved through the range of currents used by
the machine. The advantage of pulse welding lies in the low spatter welding
results, the excellent weld formation and the simple use with thin materials.

3.4.3 Dual pulse welding

Dual pulse welding is a variation of pulse welding with changing double pulse
parameters. Dual pulse welding ensures an increase in the welding quality by
improving the weld formation.

3.4.6 Electrode welding

When electrode welding, the electrode is both the arc carrier and the melting
weld material. The heat of the arc melts the wire core of the electrode and the
basis material. At the same time, the coat of the electrode provides a gas bubble
and a slag layer to protect the heated surface of the work piece from a chemical
reaction with the air surrounding it.

3.4.7 TIG welding

When TIG welding, the arc burns freely between a tungsten electrode that does
not melt and the work piece. The arc is very intensive and can be controlled well.
The tungsten electrode and the pool crater as well as the molten end of the
additional material are protected from the oxygen in the air by the inert gas. The
inert gas is a noble gas like Argon, Helium or a mix of these.
3.5

Press button, setting types

The press button [22] can be used to select three different setting types: synergic
welding programs, jobs and manual. The display LEDs [23] show which type has
been selected.
This press button is not active during welding using the TIG and electrode
welding modes.
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