bvweld, i have seen them before but always thought of them as trailing shields. may be worth the $$ for some of the more exotic metals, but for most back gas i think you would need a production run to justify the $.
although to each his own, it is a cool setup with lots of options.
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Thread: Backup gas for Stainless
03-19-2008, 11:22 AM #11thanks for the help
hope i helped
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03-19-2008, 06:57 PM #12Senior Member
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- Nov 2005
03-19-2008, 09:10 PM #13Junior Member
- Join Date
- Mar 2007
Back up gas for Stainless
You definetly you want to use staright Argon for your inner shield gas. This helps keep your weld in a clean enviroment. Make some end caps out of Aluminum foil thats the cheapest way. Put a 1/4 hole in one end to let the purge come out . Set the purge aroung 20-25 psi this will give you a nice clean weld and there will not be a sugar . Sugar on stainless is not good it can cause a bad weld and itsn't going to stand any pressure at all. I weld stainless for a living in the cryogenic and bio industry. Try this ! this should solve any problems of sugaring. What every you do don't use anything other then Argon!!!! Hope this is helpful
03-19-2008, 09:46 PM #14Senior Member
- Join Date
- Mar 2006
- Queens NY
I have used speed tape which is basically soft alluminum that is adhesive backed. I form the enclosure with the tape, alluminum foil works great too (i might suggest the heavier one like they sell at costco). I use a piece of gas welding hose with some soft copper tubing stuffed in the end so it can handle high heat, although not the best way to do it you could split the flow going to the torch and use only one regulator, but for 20 bucks you could get the western T and use a spare flow gauge. I have 2 HTP flow meters (45 bucks each on ebay) with the T. I have a valve in the backpurge line so i can turn it on and off easily. I you make your enclosure very tight you will need to make a bleed hole on the other end. I have sucessfully welded stainless with the back purge enclosure open on top (argon is heavier then air). I also use a BBQ lighter to check for lack of 02 (ghetto, but cheap and effective in my experience). Whatever you do be sure to test it first!!Dynasty 200 DX
All kinds of Smith OA gear
03-20-2008, 06:02 AM #15
Set the purge aroung 20-25 psi this will give you a nice clean weld and there will not be a sugar .
I was watching a demo for SS welding and watched other friends do it also, 5-10psi was fine for purging after a few seconds of filling up the "chamber".
No sugar and welds were beautiful!!! 20-25psi is just wasting argon.I'm not late...
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