RE: [MW:27475] P-22 plate welding ...6-MM plate

Maintain preheat to 200 C (400F) Minimum.  Use a convex bead shape in the weld centerline.

 

 

Feng Lu, Ph.D., NDE Level III Metallurgy and Welding Engineer

Zachry Industrial, Inc. 3600 West Sam Houston Pkwy South Suite 200 Houston, TX 77042 luf@zachrygroup.com Office: 713.979.2648 Cell: 512 797 5777 www.ZachryGroup.com

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: Tuesday, March 06, 2018 8:35 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27473] P-22 plate welding ...6-MM plate

 

This is due to impurities in base metal. In 6mm thickness weld, HICC is very remote.by seeing the orientation, it is type  I crack due to impurities. 

 

On Sun 4 Mar, 2018 11:28 pm anthony chundal, <anthony.chundal@gmail.com> wrote:

you have to do control preheating and also cover the same with thermal insulation wool immediately after welding if you are not doing the immediate PWHT,

 

Regards,

 

On Sun, Mar 4, 2018 at 2:15 PM, 'Muhammad Asif' via Materials & Welding <materials-welding@googlegroups.com> wrote:

This message is eligible for Automatic Cleanup! (materials-welding@googlegroups.com) Add cleanup rule | More info

Control maitenance and post heat temperature.

 

Regards,

Asif

Sent from Yahoo Mail on Android

 

On Fri, Mar 2, 2018 at 10:16 AM, George Dilintas

<dilintas@gmail.com> wrote:

most probably hydrogen cracking

 

2018-02-11 12:38 GMT+02:00 pradip kumar Sil <pradipsil@gmail.com>:

Dear Everybody,

 

We are doing  P-22 plate welding, thickness is 6 mm with E-9018B3 ( Dia 2.5 mm) electrode. Preheat is 150 to 200 degree centigrade with little beveling. Site is near the sea area.

 

We found lot of delayed crack  generally after 12 hours. Crack is coming middle of the weldment.

 

Can anybody inform me cause & corrective action for the same. 

 

Pic attached for your ready reference.

 

Thanks in advance.

Regards,

 

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A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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