Multimatic 200 Post Flow not shutting off

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Thanks for all the responses! And thank you xryan for mentioning keeping the caps on! I do keep them capped but not everyone would know this, and with so much flap disc grinding in the shop they would inevitably get loaded with metal dust. I think my warranty may be over but will check.

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I know the 200 post flow is not adjustable. Just having an issue with it staying on and just running argon after I end a bead, it happens after every 20 or so beads. To stop it I'll have to arc it on the table and then it will stop. I'm assuming this is circuitry not a solenoid or anything mechanical?...

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Custom design for a window used for ventilation that remains open most of the time. The scroll work is all hand bent 3/8 inch solid tubing and 1 x 3/16 flat stock. The welding is TIG (tungsten inert gas. The finish will be a black oxide patina leaving the "S" as shiny brass, then it will be...