Line-powered TIG welders use magnetic amplifiers, aka "saturable-core reactors", to control current on the AC side of an AC - DC circuit. They are like transformers, but they have a control winding and a load winding. Increasing DC current through the control winding will saturate the core and reduce the reactance (electrical inertia) of the load winding, allowing more AC current to flow through it. Like transformers, they fail when the winding insulation breaks down and you get shorted turns. They are not complicated if you know what the objective is.
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~4 deuces (2 running), one command trailer
~3 FWDs, '64 GMC KV-4000, '67 Zeligson digger derrick, '74 Oshkosh dump
'74 P&H 325TC latticed boom crane
two '80 Scout diesels
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