3
Function specification
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This machine has the following features in MMA operation:
•
Arcforcing
Shortly before the electrode threatens to stick, the arcforcing device sets an increased current
designed to prevent the electrode from sticking.
The value of the increased current depends on the welding voltage and the setting on the
arcforcing rotary dial (Chap. 2, item L).
"Far left" position:
Low arcforcing
⇒
gentle arc,
little increased current before short-circuit.
Used with stick electrodes enveloped with rutile.
"Centre" position:
Moderate arcforcing
⇒
normal arc,
moderate increased current before short-circuit.
Used with stick electrodes enveloped with basic material.
"Far right" position:
High arcforcing
⇒
severe arc,
high increased current before short-circuit.
Used with cellulose stick electrodes.
•
Automatic hotstart device
Brief increase in the welding current during ignition time in the millisecond range.
•
Hotstart
The hotstart current is infinitely adjustable from the minimum to the main current I
1
and the
hotstart time from 0 - 2 sec with the additional remote control FR 35.
The hotstart device makes it possible to ignite and re-ignite critical stick electrodes without
difficulty.
•
Antistick
If the stick electrode sticks in spite of the arcforcing device, the machine automatically switches
over to the minimum current within about 1 sec, so that overheating of the electrode is
prevented. If the antistick device has responded, check the welding current setting and if
necessary correct it.
