liquid argon

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does anyone know what liquid argon is used for i seen it in a phamplet at the lws and was just curious what it is used forComplete Fabrication Shop specializing in pipe fabrication. Also offering heavy steel fabrication and sheet metal work.
Reply:It's used for the same purposes as gaseous argon - a shield gas for TIG or  aluminum welding using MIG.  For volume users, you can store a lot more argon in the same volume in the liquid form than as a compressed gas. Check out the density difference.Density, Liquid @ BP, 1 atm: 87.40 lb/scf Density, Gas @ 68°F (20°C), 1 atm: 0.1034 lb/scf Don't know if it's cheaper as a liquid, but it would certainly save many trips to refill compressed gas cylinders.  Here is a link that explains handling and storage of liquid argon.  The same type system is used for liquid nitrogen.Last edited by Teddco; 11-01-2008 at 10:09 PM.TeddCoHTP Microcut 400 & Invertig 160DC  Smith Dual Guard MD-510 OA Rig  Lincoln SP135+  Hobart Stickmate LX 235/160
Reply:Liquid Argon may be used as a cryogenic liquid - for freezing things and keeping them cold.  Argon has a boiling point of -186°C (-302°F) which is far colder than CO2. (boiling point = -78.5°C or 109.3°F)  Besides being the most common of the nobel gasses, Argon is also perhaps the most nobel of the nobel gasses and forms no chemical bond or compound with any other element. Being an element it also does not readily breakdown into other constituent elements or chemicals. These properties lend it well to many industrial applications requiring an inert atmosphere or cryogenic liquids.-MondoMember, AWSLincoln ProMIG 140Lincoln AC TombstoneCraftsman Lathe 12 x 24 c1935Atlas MFC Horizontal MillCraftsman Commercial Lathe 12 x 36 c1970- - - I'll just keep on keepin' on.
Reply:umm Mondo,It's "noble" gas.  "Nobel" was the last name of Alfred Nobel, inventor of dynamite and the fortune there of which enabled him to fund and found the Nobel Prize(s).To the OP re: liquid argon, what they all already said.    The best laid schemes ... Gang oft agley ...
Reply:MoonRise:Crypo typo.  Thank you for making that correctioms and distinction.   I still haven't found a keyboard that cam spell.   Can I send you alkl my typing for prtoofreading??  Thanks!  I knew I could conut on you!  -MondoMember, AWSLincoln ProMIG 140Lincoln AC TombstoneCraftsman Lathe 12 x 24 c1935Atlas MFC Horizontal MillCraftsman Commercial Lathe 12 x 36 c1970- - - I'll just keep on keepin' on.
Reply:Hiya,The answers above are spot on.  But for interest, it is also used in LSND welding (low stress no distortion welding)  whereby it is sprayed on the backside of thin plate, slightly behind a TIG welding torch.  In theory it changes the thermal profile across the weld and reduces stresses imparted in the weld.  And you would do all this to stop thin sheet from deforming.  Not very pactical eh?Poe
Reply:Poe said:  "...used in LSND welding (low stress no distortion welding) whereby it is sprayed on the backside of thin plate..."So how thin is thin?-MondoMember, AWSLincoln ProMIG 140Lincoln AC TombstoneCraftsman Lathe 12 x 24 c1935Atlas MFC Horizontal MillCraftsman Commercial Lathe 12 x 36 c1970- - - I'll just keep on keepin' on.
Reply:Hi Mondo,What I meant by thin is 2 - 5mm, which I know is not really thin, but it is aimed at TIG done in a single pass, preferably with no filler.  When high tolerances are needed, and you have a large thinner walled structure, this in theory could be used to reduce distortion from welding.  Practically though, it is a nightmare. Poe