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[MW:23256] Re: Welding P91 without PWHT

By Materials & Welding
You need to go to the link below to download a couple of documents. Note that EPRI has been conducting a tremendous amount of research since July 2011 looking at alternative weld repair options for Grade 91 steel without PWHT and with reduced PWHT temperatures (minimum 675C). The document below is a best practices guideline which contains a large amount of information and is free for download:

http://www.epri.com/abstracts/Pages/ProductAbstract.aspx?ProductId=000000003002003833

The second document is nearly completed and should be available in 1-2 weeks for download. It justifies lowering the minimum PWHT for Grade 91 steel to 675-700C (depending on what the Codes decide to do). Even in the event that the construction code or jurisdiction mandates that you PWHT the stated connection, having a much larger range for PWHT will be hugely beneficial because there are significant challenges in performing proper PWHT for thick to thin transitions as you describe below. The report number for download will be number 3002005350. 

On Saturday, May 9, 2015 at 12:23:28 AM UTC-4, José Luís Ferreira wrote:
Is there an alternative to weld P91 to P91 (Cr-Mo-V) without performing PWHT? I need to weld (repair) small valves (socket welds) in field.

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