what is the importance of this? looking at the diagram on my Eastwood Tig 200, it show's upwords of 6 sec. for each row and seems to me like it's wasting a bit too much gas. just trying to get an idea of what importance this has on the quality of the weld???

 

Protects the quality of the weld as it cools down so that there is no contamination. Usually it is 1 second of post flow gas per 10 amps. If you are welding at 60Amps, postflow should be around 6 seconds.

 

i alway thought that the gas coverage was needed to protect the arc from letting in any contaminants. i cease to understand how it is that any contaminants can get into the weld after the arc has ended, and the puddle has turned to its hardened form

also, based on that math, this is a 200amp welder, and the Post Flow dial only goes up to 8 seconds. so what does this mean for the welds i am performing over 80amps???

 

if the metal is still red hot and the post flow ends ur going to have some grey welds which is not eye appealing and is no bueno as i believe its a light surface oxidation on top if ur nice weld. if ur post flow only goes to 8 seconds then what i do is touch the tungsen to the metal and blip the pedal real quick after about 6-7 seconds to get the post flow to start again for a little longer post flow.


mike

 

that makes sense...thanks Mike

so really, the post flow just protects the surface from allowing in fresh air while it cools down to reduce the risk of oxidation...i think i got it now

 

correct


mike