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Technical Discussions
GOWRISANTHOSH
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 52

GOWRISANTHOSH

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
52
14:23 Mar-23-2012
Circumferential scanning by UT

Q. Circumferential angle beam scanning is carried out form OD surface using 60 Degree shear wave angle beam probe on a tubular forging whose OD is 400mm and ID is 320 mm. The effective coverage in this scan is ?

I have used the formula for above question is
X=OD/2(1-SIN60)

am I correct?

help me..

Ed T
Ed T
02:28 Mar-24-2012
Re: Circumferential scanning by UT
In Reply to GOWRISANTHOSH at 14:23 Mar-23-2012 (Opening).

The following formulas can be used to determine the refracted angle and impinging angles for circumferential scans.

a.) To determine the refracted angle of the shear wave from the probe, use the following formula:
sin  1 = (sin  2 * Velocity Shear)/Velocity Longitudinal

b.) To determine the impinging angle at the ID surface, use the following formula:
sin  2 = sin  1 * (Inner Diameter)/Outer Diameter

Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 877

Michel Couture

NDT Inspector,
consultant,
Joined Sep 2006
877
03:33 Mar-26-2012
Re: Circumferential scanning by UT
In Reply to GOWRISANTHOSH at 14:23 Mar-23-2012 (Opening).

GOWRISANTHOSH

ID radius / OD radius = Sin-1 (maximum angle use for inspection)
160mm / 200mm = 0.8 = 53.1°

90° - 53.1° = 36.9° (angle spread between surface and maximum angle used for inspection)

40mm (WT) / 36.9° = 1.084mm per degree

90° - 60° (your probe angle) = 30°
30° * 1.084mm = 32.52mm

ROSHAN SIGNH
NDT Inspector,
India, Joined May 2011, 1

ROSHAN SIGNH

NDT Inspector,
India,
Joined May 2011
1
14:40 Mar-20-2014
Re: Circumferential scanning by UT
In Reply to Michel Couture at 03:33 Mar-26-2012 .

Q.specify calculation of acoustic velocity?

NDT Inspector, Materials Engineer
Poland, Joined Apr 2012, 51

NDT Inspector, Materials Engineer
Poland,
Joined Apr 2012
51
09:08 Mar-22-2014
Re: Circumferential scanning by UT
In Reply to GOWRISANTHOSH at 14:23 Mar-23-2012 (Opening).

Hi,
In EPOCH 600 from Olympus is "CSC" function, if you enter Outer Diameter for example 400mm and thickness 80 mm he will calculate right angle and sound path (trigonometry).

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