REHM INVERTIG.PRO digital 240 DC, 240 AC/DC, Руководство по эксплуатации

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Functional description
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3.8.4 Welding with Lift-Arc
When welding with DC or AC current, contact ignition (Lift-Arc) can be carried
out. The high frequency is switched off when doing this. In order to ignite the arc,
the electrode is applied and the torch button is pressed. When the electrode is
raised, the arc ignites under program control and without wearing the sharpened
electrode. This facility may be advantageous when working on sensitive
electronic devices (e.g. in hospitals, when carrying out repair welding on CNC-
controlled machinery), if there is a risk of interference from high-voltage pulses.
3.9 Pulsing multifunction button
The multifunction button [6] is pressed to select time pulsing, hyper pulsing® and
no pulsing (pulsing off). The setting options are always selected and set using
the same principle, see chapter 3.4.2.
3.9.1 I1 pulsing time t1
The I1 pulse time t1 is set as described in Chapter 3.4.2. TIG welding, TIG spot
welding and TIG interval welding with pulse function can basically be divided into
two areas:
1. Time pulsing with pulse times between 0.1 and 5.0 seconds
2. Hyper-pulse with pulse frequencies between 10 Hz and 15 kHz
During TIG pulse welding, automatic switching between currents I1 and I2 takes
place continuously. When doing this you have free choice of which current is the
bigger high current and which is the smaller low current.
Fig. 23: Welding current when pulsing
Pulsing can be switched off and on again during welding by pressing torch button
2. If torch button 2 is pressed with a pulsing welding current, pulsing is switched
off and welding continues with welding current I2. Welding can continue with
welding current I2 until a new filler is taken, for example, and welding is
continued with a pulsing welding current by pressing torch button 2 again.
Time pulsing: Pulsing with pulse times of 0.1 to 5.0 seconds
The settings for I1 pulsing time t1 and I2 pulsing time t2 determine the length of
time for which currents I1 and I2 should be active until switching over to the other
current. Both pulse times can be set independently of each other
The times and the welding current levels should be coordinated in such a way
that the base material is melted during the high current phase and solidifies again
during the low current phase. Because of TIG pulse welding, the weld pool is
easier to control in difficult situations (particularly in dilemmas and with large
gaps to bridge) and when welding thin sheets of metal than with a constant
welding current.
Current I1
Current I2
I1 pulse time t1 I2 pulse time t2
Time
0