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Technical Discussions
Nasser
Nasser
20:46 Jun-04-2020
Ultrasonic Automated Exam - Scan Overlap

Hello, I hope everyone is doing well during this time. I came across a question in prep for UT Level III Method Exam. I'd appreciate if anyone can help.
An automated exam of a large cylinder is to be performed using a focused transducer, focal point 1.27 mm diameter, focal length 50.8 mm and crystal diameter is 12.7 mm. To ensure 10% overlap between scans, what increment should be used?
a. 0.127 mm
b. 12.573 mm
c. 1.016 mm
d. 1.257 mm

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 815

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
815
01:42 Jun-05-2020
Re: Ultrasonic Automated Exam - Scan Overlap
In Reply to Nasser at 20:46 Jun-04-2020 (Opening).

C

 
 Reply 
 
Mikel
Teacher,
GOIERRI SCHOOL, Spain, Joined Dec 2013, 11

Mikel

Teacher,
GOIERRI SCHOOL,
Spain,
Joined Dec 2013
11
11:37 Jun-08-2020
Re: Ultrasonic Automated Exam - Scan Overlap
In Reply to Nasser at 20:46 Jun-04-2020 (Opening).

zoom image



Hi Nasser, here a little explanation
 
 Reply 
 
Nasser
Nasser
20:05 Jun-08-2020
Re: Ultrasonic Automated Exam - Scan Overlap
In Reply to Mikel at 11:37 Jun-08-2020 .

Hi Mikel,
Thanks a lot! I was missing a factor of 2 in overlap.

 
 Reply 
 
Franco
NDT Inspector
Italy, Joined Sep 2009, 14

Franco

NDT Inspector
Italy,
Joined Sep 2009
14
19:27 Jun-09-2020
Re: Ultrasonic Automated Exam - Scan Overlap
In Reply to Nasser at 20:05 Jun-08-2020 .

Hi
what happen if overlap is 50%?

Thanks

 
 Reply 
 
Mikel
Teacher,
GOIERRI SCHOOL, Spain, Joined Dec 2013, 11

Mikel

Teacher,
GOIERRI SCHOOL,
Spain,
Joined Dec 2013
11
21:52 Jun-09-2020
Re: Ultrasonic Automated Exam - Scan Overlap
In Reply to Franco at 19:27 Jun-09-2020 .

Excuse me!!! For a general case the formula would be increment = focal diameter - 1 overlap.
The best answer would be c by approximation.

 
 Reply 
 

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