RE: [MW:27336] P-22 plate welding ...6-MM plate

6mm doesn't require PWHT. Preheat is more than enough and only bainetic will for in P22. Improper cleaning. Go for 9015-B3 instead of 9018. Some impurities is in your plate. 

On 12-Feb-2018 6:19 pm, "Lu, Feng" <luf@zachrygroup.com> wrote:

Dear Pradip:

 

Delayed cracking is caused by Hydrogen embrittlement.  They are typically transverse to the weld but in your case it runs with the weld, which is unusual.   By close observation, the crack mostly offsets the centerline and near HAZ.  Because you mentioned that the joint preparation has "little beveling", I am wondering if the crack originates from under the surface where lack of fusion occurred at the fusion line.

 

To solve the problem, you may consider the following approach:

 

1.       After welding and weld metal cooled to room temperature (to finish Martensitic transformation), immediately do PWHT within  5 ~ 6 hours.

2.       If this is not feasible, conduct a Hydrogen baking heat treatment at 600 F ~ 650 F for 1 hour.

3.       Increase the bevel angle or train and enhance the welder's skill to avoid Lack of Fusion problem

 

Thanks!

 

 

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 pradip kumar Sil
Sent: Sunday, February 11, 2018 4:38 AM
To: materials-welding <materials-welding@googlegroups.com>
Subject: [MW:27331] P-22 plate welding ...6-MM plate

 

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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