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Reinhard: regulating a pig

X-Envelope-From: cabbott-at-cyberis-dot-net  Wed Aug 26 16:35:32 1998

Couldnt i just put a parralel arrangement of oven elements on the output of
my arc
welder? this would regulate the resistance the arc welder has.  that in
turn would
regulate the current that can pass thru the pig.  just a thought

Tesla List wrote:

> Hi Cabbott,
>
> Your welder is connected in series with the primary of your pig. What the
dial
>  on the welder tells you is not of interest. In order to get "warm" with
your
>  pig, you can first leave the secondary of the welding xformer unconnected.
>  This way your pig will recieve only a small amount of current. After
gaining
>  some experience with your pig you can now start to load the secondary
side of
>  your welder. For max power you can short the secondary of the welder. If
you
>  donīt short the secondary, you will need to design a load capable of heavy
>  currents (up to 250 A in your case). You donīt need ohms for this, just
> milli-
>  ohms, so heavy pieces of steel, copper, etc would do nicely. The dial lets
> you
>  change the output current of your welder, which in turn changes the
amount of
>  current going thru the primary and hence your pigs current, too. This
type of
>  ballast is known as an inductive ballast. The best combo to Vreg a pig
would
>  be a combination of resistive loads (to keep the max current at capable
>  levels) and inductive loads (to fine tune your pigs Vout).
>
> Last Note: The inductive ballast you planned to use ONLY WORKS if it has a
>  transformer. If itīs one of these new high tech inverter welders it WONīT
>  WORK, as the welding current isnīt inductivly regged. (They use a
> rectifier, a
>  HF circ and a ferrit xformer to reg the output current. If its light
> weight at
>  that amperage you probably have an inverter welder. If its nice īnī
heavy it
>  prob has an iron core xformer and you can use it.
>
> Coiler greeting from germany,
> Reinhard



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