How to backpurge when tig welding ss
05-24-2007, 03:46 PM
#11
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Join Date: Oct 2003
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Re: How to backpurge when tig welding ss
Originally Posted by lkailburn
thanks! 
read through most of it already. Good stuff, learned some important things to try next time around.
Any links on tube welding? like techniques for clamping pipe together so you can tack weld
thanks again, sorry to side track your thread btw. I'd take it to pm's but others may gain from it aswell
-Luke
read through most of it already. Good stuff, learned some important things to try next time around.Any links on tube welding? like techniques for clamping pipe together so you can tack weld
thanks again, sorry to side track your thread btw. I'd take it to pm's but others may gain from it aswell
-Luke
for aligning pipes accurately just get a couple of pieces of angle iron, weld them on the insides of a c-clamp and bingo. just insert two pipe ends, close snug and tack weld.
05-25-2007, 12:29 PM
#12
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Join Date: Aug 2004
Posts: 714
Re: How to backpurge when tig welding ss
for the benefit of everyone reading this thread, DOWNLOAD THE FABRICATION TORRENTS IN THE STICKY ABOVE!!!!
the videos are amazing. i could watch the working with tubing one every day!
im gonna go take a hose clamp and cut a window out of it :-) tig tack welding tool FTW
-Luke
the videos are amazing. i could watch the working with tubing one every day!
im gonna go take a hose clamp and cut a window out of it :-) tig tack welding tool FTW
-Luke
09-03-2007, 03:48 PM
#14
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Join Date: Sep 2007
Posts: 16
Re: How to backpurge when tig welding ss
nice job
a few things handy to know
argon is heavier than air
you can literally fill a shoe box full of it and that makes for a makeshift purge chamber for items not as easy to jig up like shown above
Reynolds Wrap Extra Heavy is also very handy for purge welding irregular items
you can actually just fill a shoe box, or your grounded item wrapped in foil, with argon from your torch head and if your setup is good
the lack of constant purge flow won't hurt you one bit
Solar-Flux can be used on the backsides of stainless welds for good results. It is the gray powder you mix with methanol obtained from the Co-op or Farmers Supply place close to you. The Solar-Flux is available online and I've tried to come up with a cheap subsitution to that powder, it's just too damned expensive
like around 50 bucks for a quart can
anyone else have a home brew solution for flux powder which will work when purging just isn't possible or too difficult?
a few things handy to know
argon is heavier than air
you can literally fill a shoe box full of it and that makes for a makeshift purge chamber for items not as easy to jig up like shown above
Reynolds Wrap Extra Heavy is also very handy for purge welding irregular items
you can actually just fill a shoe box, or your grounded item wrapped in foil, with argon from your torch head and if your setup is good
the lack of constant purge flow won't hurt you one bit
Solar-Flux can be used on the backsides of stainless welds for good results. It is the gray powder you mix with methanol obtained from the Co-op or Farmers Supply place close to you. The Solar-Flux is available online and I've tried to come up with a cheap subsitution to that powder, it's just too damned expensive
like around 50 bucks for a quart can
anyone else have a home brew solution for flux powder which will work when purging just isn't possible or too difficult?
09-03-2007, 05:55 PM
#15
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Join Date: Sep 2007
Posts: 16
Re: How to backpurge when tig welding ss
for 90 thou wall
you can really do a flawless autogenous root face pass, having 100% penetration, with no gap between the pipes
makes it much easier and provides more consisitent results
one pipe with a half thickness bevel is nice but not really required in the real world
then come in and make a final fill pass with some 1/16" fill rod
your temp is high, as indicated by the gray color on the weld, bead formation is fair but looks a bit like the speed is slow in some places and extremely fast in others
you should catch on quickly
you can really do a flawless autogenous root face pass, having 100% penetration, with no gap between the pipes
makes it much easier and provides more consisitent results
one pipe with a half thickness bevel is nice but not really required in the real world
then come in and make a final fill pass with some 1/16" fill rod
your temp is high, as indicated by the gray color on the weld, bead formation is fair but looks a bit like the speed is slow in some places and extremely fast in others
you should catch on quickly
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