Preheat & Post heating are mandatory for low Alloy steels... Cr-Moly steels are very brittle in nature and there is high chance of brittle fracture if you perform welding directly.
So, First you have to do pre-heat to make the Bevel end area and HAZ area soften. and then perform the welding by maintaining the pre-heat temperature ...once welding is completed, you should immediately do post heating and cover the weld joint with fire blanket ....so that the grain structure & material properties wont effect and to avoid delay cracking.
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regards
Anil
On Mon, Sep 30, 2013 at 8:12 AM, PK M <pkmqaqc@gmail.com> wrote:
Dear Experts,--Why post heating required for alloy steels after welding? I want to know that what is the procedure and acceptance of Post heating of alloy steel in piping specification like Section 31.3, 31.1 or Section VIII, API recommendation practices ?
Thanks,
Pkm
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