Unitor UWI 203 TP, Инструкция по эксплуатации

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Revision date: 23 09 2014 Page 8 of 24
5 WELDING
MMA (SMAW stick electrode) welding
Select MMA welding (selector switch up).
Connect ground (return) cable with good contact to
the work piece.
Select polarity and amperage as recommended for
the electrode and start arc as follows:
Drag electrode across work piece like striking a
Match and lift electrode slightly after touching work.
If arc goes out electrode was lifted to high.
If electrode sticks to work piece, use a quick twist to
free it.
Hot start
The machine has automatic Hot Start for stick electrode welding. This makes arc striking easier and
reduces the possibility of electrode sticking
TIG (GTAW) welding
Select TIG process (selector switch down) and connect TIG torch to negative (-) terminal on the
machine. The torch should preferably have gas valve on the handle. Connect ground (return) cable
with good contact to the work piece.
When the TIG process is selected normal open-circuit voltage is not present before tungsten
electrode touches and lifts from work piece. Only a low sensing voltage is present between
electrode and work piece.
The solid-state output contactor does not energize until after electrode is touching work piece.
This allows the electrode to touch the work piece without overheating, sticking, getting contaminated
or contaminate the work piece.
Start the arc as follows:

Turn gas on.

Touch tungsten electrode to workpiece at weld start point.

Hold electrode to workpiece for 1-2 seconds, and slowly lift electrode.
The arc is formed when the electrode is lifted.
.
1 Electrode
2 Workpiece
3 Arc
1 Electrode
2 Workpiece Lift carefully and the arc will be
established
Touch the electrode to the work
piece. Only sensing voltage will be
present