Cracking after PWHT 1

[xray1366]

Hi.
I want to know what types of Cracking can occur after PWHT, and how size each type of cracking can grow?
Thank you for your consideration.

 

[metengr]

You have posted this question in another thread. The response was to search the internet for "reheat cracking" in steels. The same advice applies;

reheat cracking
delayed cracking from hydrogen embrittlement

http://www.google.com/search?q=rehe...ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7ADRA_en

http://www.google.com/search?q=dela...297l0l60875l45l28l0l12l3l0l265l1374l0.4.3l7l0

 

[xray1366]

The other thread was about Solidification Cracking!! Not Crackings after PWHT. I think I mustn't ask two different questions in one thread. Anyway thank you for your help.
And another question, do these two type only occur?

Special thanks to you metengr for your consideration.
Thank you.

 

[metengr]

And another question, do these two type only occur?

Probably reheat cracking and delayed cracking account for 90% of the post weld heat treatment defects in common steels. You can have stress relaxation cracking in certain nickel-base alloys, similar to reheat cracking but not quite the same.

 

[xray1366]

What do you mean by delayed cracking from embrittlement? Do you mean Hydrogen Cracking? It was about Hydrogen cracking everywhere I searched. I didn't find it after PWHT, just after welding. I'm so confused. Please excuse me for my questions.

 

[metengr]

Look again

http://www.google.com/search?q=dela...d+cracking+in+steel+after+PWHT&aq=f&aqi=&aql=

Delayed cracking or hydrogen embrittlement can occur some time after welding (immediate or delayed in time by 24 to 48 hours). I have seen it after PWHT because NDT was done after PWHT. Also, the cracking can occur before PWHT, when subsurface and after PWHT is observed at the surface.

 

[xray1366]

Thank you very very much for your useful answer. It's my honor to ask you and see your answer.