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317L to 5Cr Dissimilar Weld with overlay

317L to 5Cr Dissimilar Weld with overlay

317L to 5Cr Dissimilar Weld with overlay

(OP)
Thanks for taking the time to read this post.  Does anyone out there have a suggested weld-procedure to weld a 317L nozzle into a 5Cr flush patch?  I'm considering the option as a temporary replacement for a number of thermowells and vent connections on a 5Cr vacuum tower transfer line.  I'd have 12x12x0.375 thk. flush patch, 1-1/2" sch160 nozzle, and 0.125" 317L overlay on the I.D. of the patch.   The nozzle-to-patch weld would be a full-penetration weld.  The service is two-phased reduced crude under vacuum ~720degF and I have a problem with napthenic acid attack at the discontinuities.  The intent of the overlay is to protect the nozzle-to-patch weld from seeing the process (I need the higher Mo content in the 317L).  The reason I'm leaning towards the patches is because we've had several thru-wall failures in the HAZ of the nozzles in addition to local thinning of the nozzle.  FYI, we're also installing a reinforced 20" manway into the line to facilitate fit-up and grinding from the I.D. of the larger O.D. pipe.  I'm looking for assistance with the following:

1.  An idea on the appropriate rod for the root & subsequent passes (Inco 625, 309, etc.?).
2.  Preheat and PWHT temps.
3.  Should I be concerned with the required temp to PWHT the 5Cr material with the 317L nozzle attached?  Does this need to be a local vs. baking the entire assembly?

Thanks in advance

RE: 317L to 5Cr Dissimilar Weld with overlay

Please do not cross post,
thread725-175154

RE: 317L to 5Cr Dissimilar Weld with overlay

(OP)
I didn't know that this was against any established protocol.  My intent was to solicit feedback from other users who may not be members in the Structural Engineers forum.  Thanks.

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