Maximum Interpass Temperature

Date 07-24-2007 15:27

AWS D1.1 does not directly address maximum interpass temperature. If you are doing carbon steels, I think 500° to 550°F would be more appropriate. This data is in ASM Handbook 6 I think.

By rickc

Date 07-24-2007 16:04

There's not really a hard answer in AWS.
Section 5.8 says to follow the producer's recomendations. For example, the Mittal T-1 sheet in front of me reads no more than 400 deg. F. for 514 up to 1-1/2" or 450 deg. F. for 514 greater than 1-1/2". Table 3.2 lists the maximum interpass temperature for a couple materials in the footnotes. Table 4.5 limits maximum interpass for GTAW based on the maximum interpass temp. recorded during qualification. If CVN's are required then you're also restricted to the maximum heat input you qualified with by Table 4.6.

By swnorris (****)

Date 07-24-2007 16:30 Edited 07-24-2007 16:34

D1.1 does not address the maximum interpass temperature. We use 550 degrees.

Two good articles:

Importance of Interpass Temperature

http://www.jflf.org/pdfs/papers/keyconcepts3.pdf

Taking your Welds Temperature

http://www.aisc.org/ContentManagement/ContentDisplay.cfm?ContentID=512

Also,

http://www.mwsco.com/kb/kb_frameset.asp?ArticleID=73

By js55

Date 07-25-2007 14:43

I would have to argue that there is a lot of good metallurgical logic being used to justify interpass maximums on carbon steel. Most of us know them quite well. But the reality is millions of tons of this stuff is welded every single day without the slightest interpass max control and ner a failure in sight.

By Sean Landrum Date 10-14-2008 14:44

swnorris,
Is that for a572 or carbon steel in general?
Sean

By freewelder (*)

Date 10-15-2008 08:42

Useful info. Thanks.