Hi Ravi,

The following might be helpful.

https://www.nrc.gov/docs/ml1116/ML111661838.pdf

Regards,

Simon

Simon Smith sir, thank you for sending the doc. Though the doc contains important aspects of welding but I am unable to find the solution of my query there.

Thanks.

Hi Ravi,

Perhaps you could try to re-express your question.

I thought that the weld tears when it cools because tension develops across the weld during this time and the material (if it is vulnerable) has a temperature range at which the ductility becomes small. The combination causes the tear.

Regards,

Simon

The ductility curve focuses on total strain to failure at each temperature, which is necessary for assessing cracking risk during solidification. While strain rate influences ductility, it’s not what the ductility curve primarily describes. Instead, the curve helps derive the critical strain rate for temperature drop (CST) by combining strain tolerance at each temperature with the cooling rate.

Simon Smith sir, yes that is exactly what soldification cracking. My query is about the ductility curve which is between strain and temperature but the slope of the curve is expressed in terms of strain rate. So, why the ductility curve is not been strain rate and temperature but only strain and temperature ?

Brahim Lakli , yes it seems between strain rate and cooling rate. I am convinced. Thanks for clearing the doubt.

Hi Ravi,

(No need to call me sir).

Page 9 of the web link I sent shows "Ductility-Dip and Brittle Temperature Ranges". There is no mention of strain rate at all.

Regards,

Simon

Simon Smith sir, yes.. I went through. This is what my query was.. No mention of strain rate which is right but the slope of this curve is called in terms of strain rate because of the reasons discussed earlier in this thread.

Thanks..

Hi Ravi,

(No need to call me sir).

Yes, you really only need to concentrate on the value of ductility at each temperature in terms of strain. This should be compared to the level of strain in the material as it cools. If the applied strain is greater than the ductility, the material will tear.

Best wishes,

Simon

Thanks Simon Smith sir (Sorry but its by nature to call sir to even 1 year senior to me and you are much more) for your explanation. I can clearly understand it.