types of cracking in welding

[Manindra Singh]

Dear Experts,

Can anyone please guide me about types of cracking in welding classified as Type I, II, III and IV cracking.

Any literature will help a lot.

Regards,

Manindra Singh

Sr. Inspection Engineer

Indian Oil Corporation Ltd.

Dear materials-welding ! Get Yourself a cool, short @in.com Email ID now!

[Bathula Raghuram (Mumbai - PIPING)]

Type 1: located in the weld metal

Type 2: located in the weld metal but can propagate to HAZ/BM

Type 3: initiated in HAZ (close to fusion zone) and can propagate in to BM.

Type 4: initiated in HAZ (away from  fusion line)

 

http://www.igcar.ernet.in/benchmark/science/11-sci.pdf

[Lab]

Dear Mr. Singh,

 

The following information will help you to understand the basics of cracks.

 

Cracks that have been categorized as Type I, Type II, Type III and Type IV are given below.

 

The Type I and Type II cracking originate in weld metal, propagate either through the weld metal itself (Type I) or cross over in the HAZ (Type II).

The Type III cracking occurs in the coarse grain region of HAZ and by refining the grain size it can be avoided.

Type IV cracking nucleates and propagates in the intercritical/fine grain region of HAZ. It is not possible to avoid Type IV cracking but it can be minimized.

 

The above figure illustrates types of cracking in weld joint of steels on service exposure

 

Expect some more details from others.

 

Regards,

A Meganathan

Manager

Cochin Shipyard Limited

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.

!-- Virus-Free Mail Using AntiVirus for PostMaster Enterprise & QuickHeal Engine --!

The information contained in this message are Cochin Shipyard Limited confidential and proprietary information and is intended only for the use of the recipient(s) named above. If the reader of this message is not the intended recipient, he/she is hereby notified that any use, dissemination, distribution, or copying of this communication or any of the content is strictly prohibited. In such case, please advise the sender immediately and delete it from your system. Further acknowledges that any views expressed in the message are those of the individual sender and no binding nature of the message shall be implied or assumed unless the sender does so expressly with due authority of Cochin Shipyard Limited.


----------------------------------
Cochin Shipyard Ltd, Cochin, India


!-- Virus-Free Mail Using AntiVirus for PostMaster Enterprise & QuickHeal Engine --!

[Lab]

Please visit the following link to understand about type iv crack

 

http://www.twi.co.uk/services/technical-information/faqs/material-faqs/faq-what-is-type-iv-cracking-and-how-is-it-detected/

 

Regards,

A Meganathan

----- Original Message -----

From: Manindra Singh

To: materials-welding

Sent: Wednesday, June 13, 2012 3:56 PM

--

To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.

!-- Virus-Free Mail Using AntiVirus for PostMaster Enterprise & QuickHeal Engine --!