Ron,The reason that it works is that in normal welding operation, the welding arc produces very nearly a short circuit through the welding transformer secondary windings.
The welding system is designed to have sufficient impedance so that it can tolerate a shorted secondary for extended periods.
Placed in series with the primary of your pole transformer, the welder also limits the maximum current that can flow through the pole transformer, which has a very low impedance by design.
DaveSo if you short the secondary, that is maximum load causing the primary reactance to greatly decrease thus raising the primary current to a maximum. ( And burning up the transformer as a result.)
So it seems to me that an unloaded secondary is the best situation while using a primary as a choke coil. And yet, Tesla coilers seem to get best results with a shorted secondary on the welding transformer. Please explain. Thanks, Ron Reeland
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