Arc welders as curent limiters

I've seen references on this list to the use of arc welders as current
limiting devices in the primary circuits of large transformers for Tesla
coil operation.  Although my application is non-TC, I do need to limit the
current drawn by a 12 KVA 206 ro 30V transformer under short circuit
conditions.  Could some kind soul explain how the welder is hooked up to
perform this function?  Reply off-list if the subject is too off-topic.