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Old Aug 09, 2012, 08:05 PM
charles@littlewrongs.org.uk
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3 phase welder in 3 phase convertor

Does anyone has experience of running a 3 phase MIG welder from either single phase supply or a 3 phase rotary convertor. All advice welcomed on "de-rating" or other issues.

Thanks

Charles
Old Aug 10, 2012, 05:21 PM
Andrew Mawson
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Re: 3 phase welder in 3 phase convertor

wrote in message
news:8aae25f0-7cb8-4326-81fb-16c132fa86f6@googlegroups.com...

>
>Does anyone has experience of running a 3 phase MIG welder from either
>single phase supply or a 3 phase rotary convertor. All advice welcomed on
>"de-rating" or other issues.
>
>Thanks
>
>Charles


Charles, most don't actually use all three phase, just use two phases to
give 415v to reduce the current - this can easily be determined opening up
the back of the welder by seeing if it has a three bobbin or a one bobbin
transformer. If indeed it is one using two phases you will get away using a
suitably sized 240 to 415 transformer.

AWEM

(pst - want to buy a big 240 to 415v transformer as I have one surplus<G>)
Old Aug 10, 2012, 05:23 PM
news.virginmedia.com
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Re: 3 phase welder in 3 phase convertor

<charles wrote...

> Does anyone has experience of running a 3 phase MIG welder from either
> single phase supply or a 3 phase rotary convertor. All advice welcomed on
> "de-rating" or other issues.
>


I've seen mention of using power-factor correction cap's to generate a "wild
leg" for welders - it was on one of the american metalworking sites, perhaps
Practical machinist? The real problem is likely to be getting 380 - 415
volts in though. I think a rotary convertor is going to need a *big* motor
though, if the welder's expecting to pull (e.g.) 5 KVA form 3-phase, the
motor will need to be 10HP or more to do the job, and will stiull need some
way of stepping up the voltage - most often this would be an old 240/415
volt welder....

Dave H. (the other one)
 


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