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Technical Discussions
Youn Hyongchan
Youn Hyongchan
08:39 Dec-29-2015
FBH (hole size=0.2mm)

Dear expert

I'd like to make the FBH reference block, but one problem is hole size that are required 0.2mm. Is there anyone to know about the manufacturing company to making 0.2mm FBH?
- Material : STS 304
- Hole size : 0.2mm

Thanks and best regards

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 786

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
786
00:34 Jan-01-2016
Re: FBH (hole size=0.2mm)
In Reply to Youn Hyongchan at 08:39 Dec-29-2015 (Opening).

You can use a larger hole and transfer amplitude based on ratio of areas as per ASTM E-2375, Table 5

 
 Reply 
 
Simon Amallraja
Consultant, Advanced NDT Methods
Anu Consultants, India, Joined Aug 2013, 40

Simon Amallraja

Consultant, Advanced NDT Methods
Anu Consultants,
India,
Joined Aug 2013
40
08:22 Jan-04-2016
Re: FBH (hole size=0.2mm)
In Reply to Youn Hyongchan at 08:39 Dec-29-2015 (Opening).

Contact PH Tools -www.phtools.com and they can help you

 
 Reply 
 
un Hyongchan
Engineering,
KSNT, South Korea, Joined Jan 2016, 2

un Hyongchan

Engineering,
KSNT,
South Korea,
Joined Jan 2016
2
08:28 Jan-04-2016
Re: FBH (hole size=0.2mm)
In Reply to Simon Amallraja at 08:22 Jan-04-2016 .

Many thanks for your reply. I already sent e-mail for this to PH tool. But, they do not answer yet..

 
 Reply 
 
Youn Hyongchan
Engineering,
KSNT, South Korea, Joined Jan 2016, 2

Youn Hyongchan

Engineering,
KSNT,
South Korea,
Joined Jan 2016
2
08:46 Jan-04-2016
Re: FBH (hole size=0.2mm)
In Reply to Anmol Birring at 00:34 Jan-01-2016 .

Thanks for your answer.
When I have ASTM E-2375, I will check it. (that need some time to buy ASTM E-2375).
And, could you please tell me your opinion about below conversion formula that I'm thinking...


- STS 304, #3 FBH (hole size 1.19mm, travel distance 31.75mm(1.25'))
- actual amplitude : 35dB (100% FSH)

0.2mm>
(1) △dB=20 log (P1 / P2)
- P1 or P2 is proportional to area
(2) so, △dB=20 log (area 1 / area 2)^2
=40 log (1.19 / 0.2)
= 30.9 dB
※if #3 FBH are used to standard, 30.9 dB is increased to detect the 0.2mm flaw.



 
 Reply 
 
Phil Herman
Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards, USA, Joined Oct 1999, 79

Phil Herman

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
USA,
Joined Oct 1999
79
17:25 Jan-04-2016
Re: FBH (hole size=0.2mm)
In Reply to Youn Hyongchan at 08:39 Dec-29-2015 (Opening).

Happy New Year Youn Hyongchan.
Thank you for contacting PH Tool on December 20th and also for posting your question on the forum. While the FBH you require for ultrasonic testing is very small (0.2mm diameter) in Type 304 Stainless Steel, it is one that capable test block manufacturers are able to produce. It would be most helpful to know the actual drilled depth of the hole from the entry surface, not the metal travel distance, but how far the drill or EDM electrode must plunge from initial contact.
Phil Herman
President/CEO
PH Tool Reference Standards
www.phtool.com

 
 Reply 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 304

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
304
19:54 Jan-04-2016
Re: FBH (hole size=0.2mm)
In Reply to Youn Hyongchan at 08:46 Jan-04-2016 .

Hi,
Before you spend money on having a test block made, if you add 30.9 dB to your signal with 1.19 mm FBH test block, what will the noise level be like? Will the S/N ratio be one that you could detect this size of defect with?

Godfrey

 
 Reply 
 

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