REHM TIGER DIGITAL 180 AC/DC ULTRA, Руководство по эксплуатации

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Function description
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In DC TIG welding the positive electrode is subject to a very high thermal load,
which can result in the electrode melting and damage even at low current.
When electrode welding with plus pole the electrode holder is also connected to
the left output socket. When setting the DC positive electrode welding is
performed with the electrode as the positive pole.
When electrode welding the polarity selected for the electrode depends on the
type of electrode being used (observe the electrode manufacturer's instructions).
5.5.4 DC negative pole (-)
In TIG welding with negative pole the negative pole is applied to the left output
socket for the TIG torch. TIG welding with direct current is usually welded with
this set-up.
When electrode welding with negative pole the electrode holder is also
connected to the left output socket. The electrode is welded with negative
polarity.
When electrode welding the polarity selected for the electrode depends on the
type of electrode being used (observe the electrode manufacturer's instructions).