one of the reasons its always worth the time it takes to read the product instruction sheet carefully is to see the features and limitations the product has built into it.
the residual gas flow is designed to help cool the tig tungsten and in theory,
the area you tig weld as your ideally keeping the torch above the weld and allowing the gas shield to help cool the area welded and the area free from atmosphere contamination for several seconds after the tig control foot petal arc is turned off.
its called post flow on the better machines its either adjustable or it will automatically continue based on the amps setting required to cool the weld and electrode , its features like that that are the reason your more capable higher quality machines tend to cost more as the extra features are rarely free.
one of the reasons I generally suggest a new weldor (person) takes a class in the proper use of his new welder (EQUIPMENT)
on my ancient 300 amp miller TIG welder ,
you manually turn off the flow or the tank just drains
http://garage.grumpysperformance.com/index.php?threads/shield-gas-selection-for-welding.1108/
http://garage.grumpysperformance.com/index.php?threads/bits-of-tig-welding-info.295/
http://garage.grumpysperformance.co...sten-size-amp-chart-per-metal-thickness.9235/
https://www.eastwood.com/tig200acdc...MImqGg9IK75gIVf__jBx05hgB8EAQYAyABEgK3OfD_BwE
https://www.weldingsuppliesfromioc....5gIVf__jBx05hgB8EAQYAiABEgIVYvD_BwE#manuspecs
https://www.weldingsuppliesfromioc....5gIVf__jBx05hgB8EAQYAiABEgIVYvD_BwE#manuspecs
https://www.millerwelds.com/~/media/miller electric/imported mam assets/spec sheets/0/c/b/ad4-6.pdf
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