Welding of P9 to P91 Material

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Ankit Desai Participant Join Date: Apr 2013 Posts: 2	Welding of P9 to P91 Material 04/24/2013 6:42 AM
	Dear Sir, 1) What are the points to be taken care during welding of P9 to P91 material ?? 2) if i already did welding of P9 to P9 material and during PMI if one of the material found to be P91 then what thing we have to do to pass that line. 3) what the Post weld heat treatment requirment if we do welding of P9 to P91 material. Matter urgent. Thanks in advance
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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: Welding of P9 to P91 Material 04/24/2013 7:04 AM
	How come the P91 got mixed up with the P9? __________________ "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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Ankit Desai Participant Join Date: Apr 2013 Posts: 2	#2 In reply to #1 Re: Welding of P9 to P91 Material 04/24/2013 7:17 AM
	We purchased P9 material but during PMI checking (after welding ) There is vanadium content in the material and % of the same 0.19 %.
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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: Welding of P9 to P91 Material 04/24/2013 7:22 AM
	So the reason for the query as inferred from question 2 is to find out a way of selling potentially off-spec material. What does the Client's specification say? __________________ "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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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#4 Re: Welding of P9 to P91 Material 04/24/2013 9:34 AM
	Grind all the welds off and use the correct material, welded per the welding specification you are building to, and PWHT per your staff metallurgist's instructions. Next time, send it to a competent shop for fabrication.
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Whitephone Guru Join Date: Jan 2010 Location: Mineral wells Tx Posts: 630 Good Answers: 34	#5 Re: Welding of P9 to P91 Material 04/24/2013 9:38 AM
	I think that you are talking about SA 335 (Right?) then: SA 335 Type P9 corresponding to Welding P-number 5B and SA 335 Type 91 corresponding to welding P-number 15E (15E Around 4 years ago) If you see ASME IX 2010 QW-422 the minimun tensile is different ( Take care But welding is possible). You need a WPS/PQR (Include PMI in your Approved PQR and use it for reference). Be carfully with the pre heat and the PWHT. According with ASME I, ASME B31.1, ASME B31.3 or what ? Filler metal?????
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Ankit Desai (1); lyn (1); PWSlack (2); Whitephone (1)

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