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Medium Frequency Resistance Welding Transformer With Welding Diodes MF And Controller ZMF
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.
Technology selection table
| TYPE | Unit | MF6160 | MF170-3G | MF130 | MF170 | MF220 | MF225 | ||
|
primary nominal voltage |
v | 500 | 500 | 500 | 500 | 500 | 500 | ||
| frequency | Hz | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | ||
| nominal power at 20%ED | kVA | 170 | 170 | 130 | 170 | 220 | 350 | ||
| nominal power at 50%ED |
kVA | 105 | 105 | 85 | 105 | 150 | 225 | ||
| nominal power at 100%ED |
kVA | 75 | 75 | 58 | 75 | 117 | 170 | ||
| secondary voltage | V | 9 | 9 | 9 | 9 | 13 | 13 | ||
|
permanent DC current 100% |
A | 8500 | 8500 | 6500 | 8500 | 9000 | 13000 | ||
| short-circuit current | KA | 38 | 38 | 32 | 38 | 45 | 55 | ||
| turns ratio | N1/N2 | 55:1 | 55:1 | 55:1 | 55:1 | 38:1 | 38:1 | ||
| weight | kg | 20 | 20 | 15 | 20 | 25 | 40 | ||
| temperature switch | 2 x 150 °C, 1 x 70 °C Temperature switch |
||||||||
| insulation class | F(155°C) | ||||||||
| eddy current testing | 150mV/KA±3% | 150mV/KA±3% | 150mV/KA±3% | 150mV/KA ±3% | - | 150mV/KA±3% | |||
| size | mm | 171.5×127×295 | 160*130*256 | 150*106*276+82 | 160X125X262 | 160×125×318 | 171.5*151*450 | ||
| cooling water quant. Q Tmax. 30ºC | I/ min | 8 | 8 | 8 | 8 | 12 | 12 | ||
| pressure drop p (Q=6l / min ) | Mpa | <0.2 | <0.2 | <0.2 | 160X125X262 | <0.1 | <0.1 | ||
| Note: The electrode output mode can be adjusted as needed. Built-in () welding diodes | 2 | 2 | 2 | 2 | 4 | 4 | |||
Load endurance chart
NOTE:
If the secondary connection and secondary voltage need to be adjusted , please contact Manufacture
Duty factor diodes:from the beginning of one welding time to the beginning of the next welding (Spot to Spot)
Duty factor transformer:all welding time within 60s
CE certificate
Company Certificate
Factory environment display:
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