where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

1041 views
Technical Discussions
farabirazy
farabirazy
06:05 Nov-29-2008
Urgent- ToFD for Steam Reformer Tube

Dear Gentlemen,

Does anyone ever involve in research of ToFD for Cast austenitic stainless steel used as ammonia reformer tube? I tried to detect artificial defect in IN 519 material, but I can not distinguish the backwall signal. Can anyone explain why and what should I do to detect the defect in this material by using ToFD? As FYI, I used 2.25 MHz ToFD transducer. Is there any commercial ToFD transducer with frequency below 2.25 MHz?

Please help me...

Sincerely Yours,

Abi


 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 893

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
893
00:10 Nov-30-2008
Re: Urgent- ToFD for Steam Reformer Tube
Abi,

The frequency you are using is too high. ASTM A388 para 8.2.1 states that the prefered frequency for coarse grain austenitic materials is 1 MHz and that in many instances it may be necessary to use a frequency of 0.4 MHz. I know that ASTM A388 is for Ultrasonic Examination of Heavy Steel Forgings, but the reason for freqyency selection doesn't change. You are dealing with a very coarse grain structure and you need to lower your frequency..

Hope this will help.

Cheerio's
Michel

----------- Start Original Message -----------
: Dear Gentlemen,
: Does anyone ever involve in research of ToFD for Cast austenitic stainless steel used as ammonia reformer tube? I tried to detect artificial defect in IN 519 material, but I can not distinguish the backwall signal. Can anyone explain why and what should I do to detect the defect in this material by using ToFD? As FYI, I used 2.25 MHz ToFD transducer. Is there any commercial ToFD transducer with frequency below 2.25 MHz?
: Please help me...
: Sincerely Yours,
: Abi
------------ End Original Message ------------




 
 Reply 
 
Ed T.
Ed T.
09:53 Dec-02-2008
Re: Urgent- ToFD for Steam Reformer Tube
----------- Start Original Message -----------
: Abi,
: The frequency you are using is too high. ASTM A388 para 8.2.1 states that the prefered frequency for coarse grain austenitic materials is 1 MHz and that in many instances it may be necessary to use a frequency of 0.4 MHz. I know that ASTM A388 is for Ultrasonic Examination of Heavy Steel Forgings, but the reason for freqyency selection doesn't change. You are dealing with a very coarse grain structure and you need to lower your frequency..
: Hope this will help.
: Cheerio's
: Michel
: : Dear Gentlemen,
: : Does anyone ever involve in research of ToFD for Cast austenitic stainless steel used as ammonia reformer tube? I tried to detect artificial defect in IN 519 material, but I can not distinguish the backwall signal. Can anyone explain why and what should I do to detect the defect in this material by using ToFD? As FYI, I used 2.25 MHz ToFD transducer. Is there any commercial ToFD transducer with frequency below 2.25 MHz?
: :Please help me...
: : Sincerely Yours,
: : Abi
------------ End Original Message ------------
Michel is correct. You need to use a 1.0 MHz. Ducer. But it also needs to be a dual focused probe focused for the thickness you are examining with a refracted longitudinal wave mode..
But it can be done.
I would also recomend the use of a UT scope with a strong pulser. That material is tough and some of the grains can be as big as your calibraton reflectors.




 
 Reply 
 
jaidev
jaidev
13:21 Nov-23-2012
Re: Urgent- ToFD for Steam Reformer Tube
In Reply to farabirazy at 06:05 Nov-29-2008 (Opening).

any success using 1MHz probe

 
 Reply 
 

Product Spotlight

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

IntraPhase Athena Phased Array System

The Athena Phased Array system, manufactured by WesDyne NDE Products & Technology, consists of a pha
...
sed array acquisition system and PC running IntraSpect software. A PC is used to perform acquisition, analysis and storage of the data. System hardware is capable of operating up to four data sets with any combination of phased array or conventional UT probes. NOW AVAILABLE IN 64-64 CONFIGURATION.
>

TraiNDE UT

TraiNDE UT is a virtual tool associated with a signal database which simulates real inspection con
...
ditions for numerous applications (Type A/V1 block, DAC block, welds and plates).
>

PAUT Probes

Typical Phased Array probes have frequencies between 1MHz and 20MHz and the number of wafers is 10
...
to 128. M2 Electronics offers customers conventionally ultrasound probes and the ability to provide high-precision Phased Array Ultrasound Probes of up to 256 wafers. We can also customize the probe for our customers to meet the specific application requirements of the user.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window