SS Welding Purge Gas

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raviloop Member Join Date: Sep 2011 Posts: 6	SS Welding Purge Gas 09/01/2011 5:05 AM
	Now , Why During SS welding purge gas is required? in some critical positions how we are manage that purge gas.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: SS welding Purge gas 09/01/2011 5:13 AM
	Because without purge gas, oxygen from the atmosphere gets into the weld and at the high temperatures there, affects the quality of the weld through a chemical reaction with the molten substances present. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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raviloop Member Join Date: Sep 2011 Posts: 6	#2 In reply to #1 Re: SS welding Purge gas 09/01/2011 7:50 AM
	But we are using shielding gas in TIG welding , it protects oxidation from atmosphere. in other material TIG welding we cannot use purge gas.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 In reply to #2 Re: SS welding Purge gas 09/01/2011 7:51 AM
	Er, the argument is what, please? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Mikerho Guru Join Date: Jan 2007 Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis) Posts: 4216 Good Answers: 194	#4 In reply to #2 Re: SS welding Purge gas 09/01/2011 8:24 AM
	TIG = Tungsten Inert Gas Inert Gas = Purge Gas __________________ "Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#5 Re: SS Welding Purge Gas 09/01/2011 9:43 PM
	The gas fed through the TIG "torch" is usually called "shielding gas"; "Purge gas" usually refers to additional gas fed into a vessel or pipe. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#6 Re: SS Welding Purge Gas 09/03/2011 11:35 AM
	Tornado is right. Purge gas keeps the inside of the pipe or vessel free of oxidation during welding. Shield gas keeps the outside of the pipe or vessel free of oxidation during welding.
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lyn (1); Mikerho (1); PWSlack (2); raviloop (1); Tornado (1)

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