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

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Function description
34
Example:
Pulse frequency = 50 Hz
Total pulse time = I
1
-pulse time t
1
+ I
2
-pulse time t
2
= 1 / Hz = 20 ms =
0.02 s
I
1
-pulse time t
1
= 0.5 * total pulse time = 0.01s
I
2
-pulse time t
2
= 0.5 * total pulse time = 0.01s
This means that the current when welding has the value current I
1
for 0.01 s (=
10 ms), then for 0.01 s (= 10 ms) the value current I
2
, then once again for 0.01 s
(= 10 ms) the value current I
1
, etc.
Pulses of such short duration bring about a more narrow arc and deeper
penetration.
The current average value is always shown in the main display field because of
the rapid alternations. This means that for welding current I
1
= 100A and I
2
= 50A
the indicator shows 75A.
6.1.8 Manual pulsing
If, with the TIG 2 cycle function, torch trigger 1 is actuated during the slope-down
time, then the welding current immediately jumps to the value used for welding.
The average energy is infinitely variable and can be directly selected depending
on the time at which the torch trigger is actuated during slope-down.
t
t
t
Fig. 16 : Flow diagram Manual Pulse
6.1.9 Slope-down time
The current slope-down time is the period in which the welding current decreases
linearly to the end-crater current. With 2 cycle welding the current slope-down
time begins immediately after release of torch trigger 1.
With 4 cycle welding the slope-down time begins during welding with the
actuation of torch trigger 1. The slow slope-down of the welding current prevents
the occurrence of end craters.
6.1.10 End crater current l
e
The end crater current is the welding current to which the welding current is
reduced when the welding process is ended. The setting is infinitely variable
between 10% and 100% of the selected current I
1
(for example:
Gas valve
Welding current
Torch trigger 1