Metallurgical affect / defect clarifications

27 views
Skip to first unread message

nawab ali bhatti

unread,
May 19, 2016, 10:37:41 PM5/19/16
to Materials-welding, material...@googlegroups.com
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




Kannayeram Gnanapandithan

unread,
May 19, 2016, 11:21:32 PM5/19/16
to materials-welding
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

--
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
To post to this group, send email to material...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/936617816.5150279.1463694788989.JavaMail.yahoo%40mail.yahoo.com.
For more options, visit https://groups.google.com/d/optout.

Aby Jose

unread,
May 21, 2016, 5:03:06 AM5/21/16
to material...@googlegroups.com
Dear all,

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

dili...@gmail.com

unread,
May 24, 2016, 5:40:41 AM5/24/16
to Aby Jose
Codes are not handbooks. Many requirement arise from experience and theoretical analysis

Sent from my BlackBerry 10 smartphone.
From: Aby Jose
Sent: Σάββατο, 21 Μαΐου 2016 - 12:03
Subject: Re: [MW:24819] Metallurgical affect / defect clarifications

dili...@gmail.com

unread,
May 24, 2016, 5:40:41 AM5/24/16
to 'nawab ali bhatti' via Materials & Welding
Forming of non tempered martensite and formation of cracks

Sent from my BlackBerry 10 smartphone.
From: 'nawab ali bhatti' via Materials & Welding
Sent: Παρασκευή, 20 Μαΐου 2016 - 05:37
To: Materials-welding
Subject: [MW:24813] Metallurgical affect / defect clarifications

Reply all
Reply to author
Forward
0 new messages