Duplex Grade UNS 31803 Weld - UT Velocity

[Saravanan Sornam]

Dear Experts ,

What is the Ultrasonic Velocity to be used for Duplex UNS 31803 material welding examination.

   Please share some data and material copy for my reference. 

Awaiting for your reply.

Thanks and Regards,

Saravanan,

Korea.

[prem nautiyal]

Hi

 

I think You can consider the velocity of sound as steel for this material.

For longitudinal waves, take V = 5900 m/sec

For shear waves, take V = 3200 m/sec

 

Regards

 

Prem Nautiyal

9769316004

--
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.

[Saravanan Sornam]

Thank you Mr.Prem , do you have any material for my reference.
Regards
Saravanan
Korea

[think.diff...@gmail.com]

Saravanan,
The basic of UT sound of velocity of Steel alsmot same including SS and CS. But to know exactly you have to calib on standard block of which material to be used.

[Kale, Bhaskar M]

YOU CAN CALCULATE ACTUAL VELOCITY IN THE MATERIAL.

BHASKAR

धन्यवाद,
भास्कर मनोहर काळे
+60149129098

[meisam shokri arfaei]

Dear fiend,

For fully austenitic stainless steel e.g., grade 302 longitudinal speed is about 5700m/s and for transverse mode is about 3120m/s.

In case of duplex you have to find the speed (long. or trans. mode) experimentally because you faced with a duplex microstructure of ferrite (microstructure for simple carbon steel) and austenite (microstructure for some stainless steels such as 302). But from my sight you can not use  individual speed for ferritic C.S. or austenitic S.S.

Regards

M. Shokri Arfaei

ISA-ISTS - Metallurgy Lab. Manager

ASNT NDT Level III

International Welding Engineer

Tel.: +98 21 66282127

Fax: +98 21 66282779

Mob.:+98 912 1394023

[Shashank Vagal]

Gents,
I am sure Mr Shokri is more correct.
In such cases, due to change in velocities and attenuation, the ultrasonic beam is likely to bend differently at the interface and a reflector may be at a different location and distance from what we would expect if we consider the material to be CS or SS.
In austenitic SS, also, many a time, we have to give proper consideration to these facts.
This effect become particularly more noticable if the beam path is more.
The angles quoted on probes are for MS of fine grains.

And this is DSS, far different in physical as well as metallurgical properties, and micro-structure.

The ultrasonic wave velocity is dependent on the attenuation which is is in return decided by the grain size - attenuation increases with increase in grain size.

But at the same time, the ultrasonic velocity is also dependent both on ferrite austenite ratio, too . The change in shear wave velocity and elastic constants for DSS is more profound than in case of longitudinal wave.

Ultrasonic wave velocity values in case of  DSS 2205 are compared with MS as given below,   

In case of DSS 2205 with UNS No. 31803 

V_L  = 5347 m/s

V_s =  3100 m/s

And for Mild Steel,

V_L  = 5900 – 6100 m/s

V_s = 3250 m/s

So, if you consider the above, different calibration blocks made from the DSS at hand will be more advisable.

With Best Regards,
Shashank Vagal