Codes are not handbooks. Many requirement arise from experience and theoretical analysis
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| From: Aby Jose Sent: Σάββατο, 21 Μαΐου 2016 - 12:03 To: materials-welding@googlegroups.com Reply To: materials-welding@googlegroups.com Subject: 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 & QUALITYMobile no: +919940739349On Fri, May 20, 2016 at 3:23 AM, 'nawab ali bhatti' via Materials & Welding <materials-welding@googlegroups.com> wrote:--Dear ExpertsWe 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 daysBest Regards
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