Phil99vette

iTrader: (11)

Do you need to shield the inside of the pipe or is there a way to weld it without shielding inside?
Phil

jdustu

iTrader: (2)

if you don't shield it you will get corosion from the inside.....you can use a chill ring and i don't believe you need to shield(with gas) it then because it blocks the atmosphere from getting to the weld...i'm sure someone here has more ss pipe welding experience than me, but i do know that some type of shielding to block exposure to air is required to keep the backside from corroding....

wkdivr

iTrader: (8)

You usually purge it with Argon. Block, or tape one end shut. Tape the other end, then make a slit with a razor blade in it for your purge line. Keep the purge on the entire time you're welding, and a few minuites after.

DC@CSC

There is a product called Solar Flux you can pick up at a welding supply shop. It takes the place of back purging the SS that your welding. I've never used the stuff before but it suppose to work.

jdustu

iTrader: (2)

heres a good article comparing flux coated rod, backing flux and back purging..

http://www.sperkoengineering.com/html/Purge.pdf

abustiffy

I just setup a backpurge with about $10 worth of components from ace. Works great.

AMSwill

iTrader: (2)

the only time we ever use back purging at the shop i work at is if the part is a high stress component like a thin wall turbo header. on our production turbo kit header...which is thick wall...we have never back purged and have not had an issue. im not saying that it is a bad idea by any means but IMO it would depend on what your doing