How to properly back purge stainless
#21
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.
#22
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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.
chek it out
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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.
Last edited by Davo346; 07-05-2010 at 08:53 AM.
#25
the other sh.. was intended for tig.for saying solar flux doesnt create the same weld.
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.
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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.
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.