Peter van Hoof wrote:

>If all heads are in parallel you would not really have to remove al other
>heads from the transformer just only have a little pressure on the ones
>not welding their resistance would be high enough not to influence the 
>head that's doing the welding.
>
>You could apply a small spring pressure to all 8 heads and increase
>pressure on the 8 heads in sequence with an air cylinder or electric 
>solenoid this could still be extremely fast.
>
>
>Kind regards
>
>Peter van Hoof
>  
>
>
You would have to turn the primary off when you change heads.

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