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Technical Discussions
Seshu
NDT Inspector,
Sivert, India, Joined May 2018, 1

Seshu

NDT Inspector,
Sivert,
India,
Joined May 2018
1
18:36 Feb-18-2020
V2 block Calibration errors

Hi professionals,

I'm facing small problem while doing clabiration UT equipment(Einstein DGS) with v2 block. I'm keeping my 70deg probe on v2 block facing 25mm radius side and catching Highpeak and I'm setting my soundpath to 25mm. If i place my probe on 50mm radius side my high peak is not coming on 50 instead it is coming on 45 to 46.5mm

And coming to index point for Expample, when i keep my probe on 25mm radius side and I'm getting my probe index at 13mm and when i keep my probe at 50mm radius side at 13mm index point I'm getting 50mm sound path but not high peak.

Hope u people will say some solution for this.

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 889

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
889
20:33 Feb-18-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

Seshu,

Maybe you should talk to someone near you and show him what you are doing. I think he could help you more than someone you are trying to explain here.

1
 
 Reply 
 
Creed
NDT Inspector,
Vietnam, Joined Jul 2009, 37

Creed

NDT Inspector,
Vietnam,
Joined Jul 2009
37
21:46 Feb-18-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

I guess you have some trouble with the calibration for velocity and zero offset, I guess you only use 1st reflection echo instead you should use 2 reflections come from both 25mm and 50mm radius for calibration then you could have a better outcome.

1
 
 Reply 
 
Keith Brewer
NDT Inspector,
New Zealand, Joined Sep 2019, 8

Keith Brewer

NDT Inspector,
New Zealand,
Joined Sep 2019
8
22:16 Feb-18-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

Try:

Get peak 25mm signal and verify index. Keep signal displayed and delay to zero. On a modern instrument this should be 25mm delay but that doesn't matter at this stage.

Reverse direction and check peak 50mm signal. Check index is same as before. Set this signal to 50mm on screen using range (velocity) control.

Repeat process delay 25mm to zero, 50mm peak to 50mm using range control until no further adjustment is needed. (A modern machine should require only the first settings.

Finally delay control to move 25mm peak back to 25mm.

I routinely use (25mm or sometimes 20mm) half round blocks to set up using first and second reflections simultaneously (25mm and 75mm peaks or 20mm and 60mm peaks) to save time. Also in my old age I have found pre-set velocities accurate for most applications.

1
 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 808

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
808
01:35 Feb-19-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

send photo on how you are placing the probe on the 50 and 100 mm R

 
 Reply 
 
vertigo
vertigo
23:33 Feb-20-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

Check velocity first, I guees it is cause

 
 Reply 
 
Akshay Gaikwad
NDT Inspector,
EQUATE Petrochemical Company, Kuwait, Joined Mar 2017, 2

Akshay Gaikwad

NDT Inspector,
EQUATE Petrochemical Company,
Kuwait,
Joined Mar 2017
2
15:18 Feb-22-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

zoom image

Notes

Pls find attached note for possible solutions, revert me for anything else.
 
 Reply 
 
Shahid Nisar
Engineering,
Saudi Arabia, Joined Feb 2009, 136

Shahid Nisar

Engineering,
Saudi Arabia,
Joined Feb 2009
136
07:52 Feb-23-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

I suspect non standard V2 block. What is the make of the V2 block you are using?

 
 Reply 
 
Udo Schlengermann
Consultant, -
Standards Consulting, Germany, Joined Nov 1998, 182

Udo Schlengermann

Consultant, -
Standards Consulting,
Germany,
Joined Nov 1998
182
11:15 Feb-24-2020
Re: V2 block Calibration errors
In Reply to Seshu at 18:36 Feb-18-2020 (Opening).

Dear colleagues,
This steel calibration block since 1991 is named „calibration block no 2“, see ISO 7963, Non-destructive testing - Ultrasonic testing - Specification for calibration block No. 2.

This calibration block with two quadrants with 25 mm and 50 mm radius is designed to generate two echoes for range setting for angle-beam testing at the same time (at least two echoes are needed for range setting).

If the angle-beam probe is directed to the 25 mm quadrant
- the first echo has a sound path of 25 mm;
- the second echo has a sound path of (25 mm + 50 mm + 25 mm) = 100 mm.
The probe has to be shifted until both echoes are at maximum.
At this position the index point of the probe automatically is above the centre marking of both quadrants.
For setting the instrument you have to use the functions “delay" and “velocity” until both echoes are at their correct positions on the display (25 mm and 100 mm).

Alternatively you can use the second direction:
If the probe is directed to the 50 mm quadrant
- the first echo has a sound path of 50 mm;
- the second echo has a sound path of (50 mm + 25 mm + 50 mm) = 125 mm.
After maximizing both echoes they have to be set to their correct positions on the display of the instrument (50 mm and 125 mm).

This procedures can be used for all beam angles.

 
 Reply 
 

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