Re: [MW:24819] Metallurgical affect / defect clarifications

Dear all,

In which standard it is mentioned about post heating? I couldn't find it in 31.3

On Fri, May 20, 2016 at 7:15 AM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

for this material , it is not required, but after completion of  welding it is better to carry out Hydrogen bake out process (based on thickness and welding process) and wrap with insulating material for slow cooling.

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

On Fri, May 20, 2016 at 3:23 AM, 'nawab ali bhatti' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Experts

We have one project, Material is Alloy P22, A335 (Cr2.25 and Mo 1), Customer requirement 

" where heat treatment of low alloy steel is required the weld joint shall be immediately heat treated without allowing it to cool below 150C (300F). if this is not practical the weld and adjacent pipe shall be uniformly heated to min 300C (570F), kept for 20 minutes , wrapped with insulation allowed to cool and heat treated later"

Please tell me what will be metallurgical affect in weld area if above condition will not follow, only maintain preheat temperature 200C during welding as per WPS/ PQR and conduct the PWHT after one or two days

Best Regards

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