If welding is stopped for some time (less than a hour), the weld shall be covered to insure slow colling and 100% MT shall be done before presuming welding,
if for linger periods, Preheat would be required.
Regards
Manpreet Singh
Welding Engineer
On Sat, 11 Dec 2010 09:58:28 +0530 Prakash Hegde
>
Hi!
Post heating is to be carried for weld which is dicontinued /interupted for long time where the preheated temeperature of the weld and surrounding area(Base)is not reduced
You can post heat discontinued weld and later on even next day you can continue the unfinished weld
However it is always advisible to complete the critical metallurgy weld in one go only (Better not to interrupt) In case of power failure you can keep the weld under preheating temperature range till the power is restored
Regards
Hegde P.B.
>
>
From: srinivas rao <ksrvasu@gmail.com>
>To: materials-welding@googlegroups.com
>Sent: Fri, 10 December, 2010 8:54:28 PM
>Subject: [MW:8670] Alloy Steel
>
> Dear All,
>
>While welding of ASTM A335 Gr P11, what to do if welding was stopped after Root Pass ,Hot Pass and One Fill-Up done without completing the job? Can we do immediately Post Heating for the un-finished job and continue welding next day? or Should we cut and re-weld the joint?
>
>I have one more doubt... In the above situation what if welding and Pre-heating(coil heating) was stopped due to power failure for 2 to 3 hrs and the joint has to come to room temp. Should the joint be cut and re-welded?
>
>Regards,
>
>Vasu
>
>
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