Technical information

Setup
2-6
1070 080 059-101 (2001.04) GB
2.5 Advantages and benefits of medium-frequency welding
The PSI 6000 medium-frequency inverters supply an MF output voltage and
DC welding current. As a result, the welding process can be controlled more
thoroughly and faster and becomes more steady. The ”good” welding range
becomes larger.
The medium-frequency welding current is clocked at 1 kHz. The current reg-
ulation system is faster and more precise compared to 50 Hz welding.
t
1 ms
tt
U
1 kHz
I
Frequency
Mediumfrequency
inverter output voltage
Welding current
Medium-frequency welding
D A direct current flows in the secondary welding circuit of the transformer.
As a result, the inductive resistance of the secondary window loses its
influence on the welding current with different immersion depths of the
electrode gun into the workpiece.
D The weight of the welding transformer is reduced. Due to the higher oper-
ating frequency, the iron content required as well as the volume are re-
duced while the performance data is maintained.
D The more steady welding current without any gaps and the possibility of
weld time variation in ms intervals allow for the metered application of en-
ergy to the spot weld and a steady growth of the spot.
D Longer electrode life.
D Good results are obtained for welding aluminium and galvanized sheets.
D Especially suitable for 3-sheet welding, very thin sheets and fine spot ap-
plications.
D Fewer welding splashes.
D Medium-frequency welding with current control improves the quality of
the spot weld.
The welding system with constant-current control (KSR) compensates
the changes in sheet resistance within the weld time and helps to obtain a
constant welding result.