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Medium frequency transformer technology is becoming ever more widely used in spot welding applications. The main benefits are:-
- Size & weight
- 1000Hz operation greatly reduces size & weight of transformers.
- This gives better manoeuvrability for manual guns and faster robot speeds in automated applications
- Welding quality
- Improved spot welding characteristics – the weld current is DC, so the energy is applied more smoothly and faster.
- Welding times can generally be reduced, with a commensurate increase in production speed.
- No inductance losses for large weld guns.
- With conventional AC guns, when large arms are required, large transformers must be used to overcome these losses. This increases gun weight still further.
- With DC secondary current. Losses from MF transformers are minimal. A 70kVA transformer will still deliver 18kA even in the largest weld gun.
- Balanced power load.
- As the control uses all 3 phases to generate the waveform to the transformer, the mains load is evenly balanced, reducing cable sizes & fuse ratings.
- Accurate weld timing for precision welding
- For applications where precision is the key, weld controls
can set the weld time to the nearest milli-second. Conventional AC controls allow time setting only to the nearest 1/100 second.
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