99345hp

if you are welding the joint properly, you will get sugar on the inside of exhaust tubing if you dont backpurge. Yes it is thin and will have no gap, but you still need 100% penetration to have a proper weld. Without a backpurge your penetration to the inside will be nothing but sugar, and that is not good.

Davo346

iTrader: (1)

http://www.solarflux.com/Graphics/we...OLAReprint.pdf
chek it out

BADD SS

iTrader: (4)

Are you a solar flux rep? 99345 was merely stating the obvious about penetration and joint fit up and here you go posting another link. I'm not sure about these other guys, but I've used solar flux and I don't like it much. IMO it takes alot more time when welding tubes, as I have a purge cylinder always standing by. I do alot of stainless work and most professionals prefer to purge.

Davo346

iTrader: (1)

not a rep,im just saying with something that thin you will get 100% penetration,and how does it take more time, not to sound like a sales rep but did you look at the article.he is not stating the obvious,just read the article.dont want to start anything,just sharing a fact.actually about everything he said was wrong.and i am a professional welder,the time you spend on taping every joint or what ever you prefer to do,you spend the same time brushing the solar flux on,dont get me wrong now when we weld at plants that produce food or anything of that nature,you know things that people consume, we back purge.but you have the same weld,just as good as back purging.

Tig

So, I was a little too dramatic with that answer, relax no need to get your panties in a bunch.
I dont like using flux. I have a purge tank/valve on hand when I need it. Wrapping joints doesnt take much time, whether you use tape or foil.

Hotrod406

iTrader: (6)

I capped a piece of tubing one size smaller than what I was welding and punched a hole in it for the purge tube. Then I slid that in the tube to be welded. I used 8 layers of tin foil and a spring type OEM radiator clamp for the other end. 8 layers so I could reuse it multiple times before it ripped. It worked great and save me a lot of time screwing around with tape.

My purge supply was tee'd from the argon line going to the torch. I'd hit the pedal a few times to let the post flow fill up the tube. It's cheaper than buying a dual regulator and it shuts off automatically.

madmax4499

iTrader: (3)

will the argon need to flow thru the pipe or do you just fill it with argon and seal it off?