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10. OPERATION (continued)
10.1.14
START setting (Lift start or High frequency start)
Start mode may be selected with LIFT START key [13]. Start mode may be indicated with
the indicator LED on the upper left of the mode selection key that turns ON or OFF for “Lift
start” or “High frequency start” respectively.
㧔
1
㧕
High frequency start
In the event that arcing does not start within approx. 5 sec. after high frequency is
generated, the high frequency and output voltage generation automatically stops. If
high frequency generation stops in such way, the torch switch must be turned OFF and
then it should be depressed again.
If such problem remains unsolved,
check if the cable and the torch are properly connected, and/or
if the electrode tip has any irregularities.
㧔
2
㧕
Lift start
This is a method to start an arc generation by supplying current to a circuit formed
with an electrode and a base metal contacted and separating the electrode from
the base metal. Neither high frequency nor high voltage is generated at the start,
and no electromagnetic interference is caused.
Ԙ
ԙ
Ԛ
Ԙ
Depress torch switch with electrode not contacted with base metal.
ԙ
Bring electrode in touch with base metal.
It is also possible to depress torch switch with electrode touched with base metal.
Ԛ
Draw the electrode apart from the base metal to generate arc.
Notes:
1
㧕
Even if torch switch is depressed with electrode not contacted with base
metal, no-load voltage is not applied (though gas is released).
2
㧕
Frequent arc starts may cause electrode surface to be stained (whitened),
due to which smooth arc start may be prevented. In such events, regrind
the electrode.
3
㧕
Nonexistence of pre flow period allows immediate arc start when electrode is
drawn apart from base metal. But if any defects were caused to an area to
start welding, adjust the time between touching and separation of electrode
and base metal as needed to provide suitable pre flow period so that the
electrode and the parts to be welded may be isolated from ambient air with
argon.
Ԙ
Depress torch switch with electrode separated from base
metal.
ԙ
Arc is generated between electrode and base metal by
means of a high frequency spark.