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GB Inspection Systems Ltd.
A leading UK manufacturer of Ultrasonic Probes, Accessories, Supplier of NDT Equipment and more.
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Technical Discussions
Ashutosh Singh
Ashutosh Singh
20:12 Apr-01-2018
Aust. S S 304L Plate Ultrasonic Examination
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screen shot of UT machine

Dear Experts,

While carrying out Ultrasonic examination of SS 304L plates of 85mm thk. with straight beam transducer, we are observing indications at almost all over the plate.

Depth of indications is 69mm to 75mm from scanning surface. While scanning from opposite direction same indications appears again at depth of 69mm to 75mm from scanning surface. No indication observed while scanning with angle beam transducer.

Manufacturing route of plate is Forged slab ----> Hot rolling to plate.

At Forged slab stage was done and no discontinuities/indications was observed.

Acceptable norms is 3mm FBH (DAC Method).

So, requesting to tell us the reasons for such typical indications.


Regards,
Ashutosh Singh

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 776

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
776
02:06 Apr-02-2018
Re: Aust. S S 304L Plate Ultrasonic Examination
In Reply to Ashutosh Singh at 20:12 Apr-01-2018 (Opening).

Many mistakes
1. Change Probe to Single Element
2. Enter Part thickness to 100 mm
3. Enter PRF to Auto

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
14:05 Apr-02-2018
Re: Aust. S S 304L Plate Ultrasonic Examination
In Reply to Ashutosh Singh at 20:12 Apr-01-2018 (Opening).


Dear Sir,
From the display it looks that your back echo is coming from about 72 mm. (unless you call this defect echo)
As pointed out by Mr. Anmol Birring it looks to be a problem with your range setting and probe delay. (your display shows that the probe delay is 18.4878 microseconds ?).
If you are still stuck up, please send the display with range setting of 300 mm and three back echoes at the defect and sound regions (along with probe details).
Best wishes
P V SASTRY

 
 Reply 
 
Rakesh Parmar
NDT Inspector,
India, Joined Dec 2014, 58

Rakesh Parmar

NDT Inspector,
India,
Joined Dec 2014
58
08:47 Apr-05-2018
Re: Aust. S S 304L Plate Ultrasonic Examination
In Reply to Ashutosh Singh at 20:12 Apr-01-2018 (Opening).

Dear Friend,

First u must have the calibration on same material block to ensure the range setting is proper.

i want to say u must have SS 304L known thickness block for verification.

thank you.

Rakesh Parmar

 
 Reply 
 
Rex Ankers
Rex Ankers
01:38 Apr-09-2018
Re: Aust. S S 304L Plate Ultrasonic Examination
In Reply to Ashutosh Singh at 20:12 Apr-01-2018 (Opening).

I agree with Mr. Birring's comments and would add that it may be useful to use a probe with a higher frequency.
One explanation for your problem is ghosting, where indications from the previous pulse are still detectable after the next pulse starts. To test for this, try:
Damp the signals by placing your hand (with couplant on) on the opposite face - the signal should drop if it is ghosting.
Reduce the PRF - the signal should disappear or move position relative to the back wall echo.
Increase the test frequency - ghosting usually disappears.
Combined double probes are best used within their focal range and are rarely suitable at 100mm.

 
 Reply 
 

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