Welding Current I - REHM INVERTIG.PRO COMPACT 240 DC Betriebsanleitung

20
controllable than with constant welding current in difficult situations (particularly,
in difficult positions and when bridging large gaps) and when welding thin
materials.
High-frequency pulses: With pulse frequencies from 10 Hz to 15 kHz
The procedure of welding current corresponds to conventional pulsing. However
the time periods for which the currents I
same. Since these time periods are very small, an identification with pulse
frequency is sensible and normal.
For the conversion to pulse frequency in the various pulse times t
following relationships are valid:
Overall pulse time = I
I pulse time t = I
1 1
Example:
Pulse frequency = 50 Hz
Overall pulse time = I -pulse time t
1
I -pulse time t = 0.5 * Overall pulse time = 0.01s
1 1
I -pulse time t = 0.5 * Overall pulse time = 0.01s
2 2
This means that the current during welding has the value of current I1 for 0.01
seconds (=10 ms) than it has the value of current l
and then it goes back to the value for current l
Pulsing with such short times results in a slimmer arc and a deeper penetration.
Due to the very quick changes, the digital display always shows the average
value. Thus, with a welding current l
3.5.8

Welding current I

Setting of the welding current I
The use of welding current I
displayed when TIG welding. Welding current I
Chapter 3.5.7) and for dual current regulation:
Dual current regulation:
General functional operation:
The dual current regulation makes it possible for the user to use a 2 button torch
with 2 different pre-set currents. This allows you to switch between the two
values I and I . The switch is performed by pressing torch button 2. Examples of
1 2
switches:
The changeover to I2 takes place for as long as torch button 2 is pressed. When
torch button 2 is released, a changeover to I1 occurs immediately
 From high current to low or vice versa, for example, when changing the
welding position.
 Manual pulsing (see Chapter 3.5.10)
 Starting with high current I1 to warm the work piece, then welding with the
lower current I .
2
 Starting with low current I
current I .
2
Switching is possible in 2-step and 4-step operation without pulsing.
The following ranges can be set in accordance with the welding current I
and I
1
-pulse time t + I -pulse time t
1 1 2
pulse time t
2 2
+ I -pulse time t
1 2
1
= 100A and l2 = 50 A, 75 A is displayed.
1
2
[9] is carried out as described in Chapter 3.5.1.
2
only makes sense for TIG welding and is thus only
2
at work piece edges, then welding with the higher
1
Functional description
are each active are always the
2
1
= 1/ pulse frequency
2
= 0.5 * Overall pulse time
= 1/50 Hz = 20 ms = 0.02 s
2
for 0.01 seconds (=10 ms),
2
for 0.01 seconds (=10 ms) etc.
is used when pulsing (see
2
and t the
2
:
1