The post flow timer on my 300HF crapped out so I replaced it with a pool timer, I get 5 seconds of post flow every time, all the time.
That said, what I am not certain of is how do you know if you have ENOUGH post flow?
Typically I am welding between 100-200 amps so 5 seconds should be find or
I have noticed the tungsten is not staying silver but I think that is in part to some of the crap I contaminated it with while welding. Need to put a new one in there and see how it goes.
Not getting to deep into welding theory but I agree that you should have shielding gas to keep the tungsten silver or not contaminated from the atmosphere. The next important item is to have shielding gas from the atmosphere until the given metal is below it's reactive temperature. Bottom line in my opinion is 5 seconds will not be enough but it will work until you get it fixed properly.
-Jonathan
Unless using low amps on thin stainless I like 8 > 10 seconds on an air cooled torch - much less seems to invite problems - 5 I think is a bit short - there are plenty of stand alone adjustable timers available at a fair price - why not use something more suitable - I like RS products even though they're not the cheapest - I include a link to one I think will suit your purpose but check first !
Lack of, or under estimating adequate post flow can/will cause/create difficult welds.along with not holding long enough at end of weld. This can cause problems with weld and tungsten contamination.
The thinking seems to be that post flow is wasting the Argon.
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DSM8,
Since you are stuck with a 5 second post flow for the moment, to cool off your tungsten faster after your arc goes out touch the tungsten to the material. This will have a cooling effect allowing the material to draw out some of the heat. This especially works if you are welding alum.
-Jonathan
Superiorwelding wrote:DSM8,
Since you are stuck with a 5 second post flow for the moment, to cool off your tungsten faster after your arc goes out touch the tungsten to the material. This will have a cooling effect allowing the material to draw out some of the heat. This especially works if you are welding alum.
-Jonathan
That is part of an approach I was thinking I can also bump the pedal really quick to give me another 5 seconds of flow after the fact, basically turn it off count to 4 then bump again really quick for another 5 sec of gas.
I will have to find a better solution I like the idea of just getting one that is set to 10 second and be done with it.
