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Invert Stationary Medium-frequency (MF) Resistance Spot welder transformers
Application
1) Spot Welder 2) SEAM Welder 3) Projection Welder 4) High Frequency Induction Heating
For all kinds of intermediate frequency, power frequency
resistance welding machine.Such as automobile welding clamp,
seam welding machine, mesh welding machine and so on.
Brief introduction
Medium-frequency (MF) transformers are a result of recent advances in resistance welding technology.
They are powered by a transistor inverter, supplying square wave AC 500 V @ 1000 Hz which is converted
by the MF transformer to a low voltage high current AC. This low voltage AC current is rectified to DC by
a diode block built into the transformer.The higher operating frequency of an MF system allows efficient
energy conversion using a smaller and lighter transformer.Other benefits with MF transformers used in
portable and robotic welding guns are:The reactance of the welding loop only limits the upslope and down
slope of the welding current, while the peak welding current in limited only by the welding loop's resistance.
The net result is again smaller transformer, especially when welding with large throat, high-impedance guns.
MF welding is less demanding on the plant power system. The MF inverter draws balanced line current from
all 3 phases and operates at a high power factor (0.9).With MF transformers the peak welding current almost
equals its RMS value, which helps to obtain quality welds with no splash and constantstrength even at lower
pressure.The high frequency permits much faster - 1000 times per second - process control, which again results
in better weld quality.
| TYPE | Unit | MF130-R6130 | MF170-R6170 | ||
| primary nominal voltage | v | 500 | 500 | ||
| frequency | Hz | 1000 | 1000 | ||
| nominal power at 20%ED | kVA | 130 | 170 | ||
| nominal power at 50%ED |
kVA | 75 | 105 | ||
| nominal power at 100%ED |
kVA | 50 | 80 | ||
| secondary voltage | V | 9 | 9 | ||
| permanent DC current 100% | A | 6000 | 8000 | ||
| turns ratio | N1/N2 | 55:1 | 55:1 | ||
| weight | kg | 20 | 20 | ||
| 2×150ºC,1×70ºC | 2×150ºC,1×70ºC | ||||
| temperature switch | |||||
| /Temperature switch | /Temperature switch | ||||
| insulation class | F(155°C) | F(155°C) | |||
| Electrical connections | primary | thread | mm | M8 | M8 |
| depth | mm | 10 | 10 | ||
| secondary | thread | mm | M10 | M10 | |
| depth | mm | 15 | 15 | ||
| cooling water quant. Q Tmax. 30ºC | I/ min | 6 | 6 | ||
| pressure drop p (Q=6l / min ) | Mpa | 0.6 | 0.6 | ||
Load endurance chart
MF130-R6130 4L/min load diagramLoad diagram for MF130-R6130 4L/min |
MF170-R6170 4L/min load diagramLoad diagram for MF170-R6170 4L/min |
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U, V Primary connection to PSI
T1 Connection of temperature sensor for monitoring the primary winding
Color coding: 2 x black (switch 1)
2 x white (switch 2)
T2 Connection of temperatur sensor for diode monitoring:
Color coding: 2 x red
+ , - Secondary connection to electrodes
MF transformer DC Unit │Series MF170/130
Welding Power Rectifier Assembly and welding diode is available!
Company Certificate
Factory environment display:
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