interpass temp/ preheat temp.

Date 12-21-2011 00:24

I am looking for any code or document which guide me to choose the proper interpass temp/ preheat temp for WPS, and If We have a WPS for 2 different material, which temp. is apply?
Thanks inadvance.
Newbee

By jon20013 (*****)

Date 12-21-2011 01:11

You can find guidance (and requirements) in most of the codes. We have no clue what you're working to so no further information ca be given.

P/S: Not trying to sound sarcastic but have you ever actually opened a code book to look on your own?

By vdao3004 (**)

Date 12-21-2011 02:23

Jon,
I do, but I would like to have all the experts help me out, I can not locate the one for me yet.
Thanks.

By kamal_welding Date 12-21-2011 10:50

Dear,

You can see the preheat requirements for process piping in ASME 31.3 clause 330 table 330.1.1 and clause 131 in ASME 31.1 for power piping. You can also get the preheat and interpass temp. in AWS D1.1 (structural welding code) table 3.2.

Before applying the preheat consider the chemisty, thickness and material supply conditions etc.

Thanks.

By nantong (**)

Date 12-21-2011 11:31

I cannot believe what I am hearing,

Have you not thought about having a look in your bid documents or in your contract documents to see what codes/specifications you are supposed to work to?????