12
Welding
A. Plasma-welding
1. Current down slope time can be adjusted at poti c to give a delay time of 0,5 to 5,0 s. after the third
operation in the 4-stroke mode has been activated (see t
a
in diagram).
2. Position of poti
h defines duration of current up-slope (see t
r
in diagram), whereas time of down-
slope tf is set at poti m.
3. Activate torch- or foot switch (lamp
g will light) 1. and 2. stroke.
4. To finish the welding operation, down-slope is initiated by actuating torch- or foot- switch.
3. stroke
(closing of keyhole)
The Plasma-key-hole system is used for porosity-free closing of key-hole circular wel-
ding after 360° during overlap. This shall reached by lower the Plasma-beam to a soft
arc, during welding of overlap. By this event, down-slop of pilot gas is first, down-slop
of welding current is after time delay according to the material thickness.
5. After the time set at poti
c has passed, down-slope starts. When down-slope is over, switch can be
released.
Installation
Torch
switch
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