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Re: [MW:14536] types of cracking in welding

By Materials & Welding
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

----- Original Message -----
Sent: Wednesday, June 13, 2012 3:56 PM
Subject: [MW:14531] types of cracking in welding

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.


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