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- since 1996 -

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Technical Discussions
Karthikeyan
NDT Inspector, Advanced Ndt Engineer(ECT, RFET, IRIS, PMI, IRT)
Tube Inspector, India, Joined Jun 2016, 6

Karthikeyan

NDT Inspector, Advanced Ndt Engineer(ECT, RFET, IRIS, PMI, IRT)
Tube Inspector,
India,
Joined Jun 2016
6
12:32 Jul-23-2016
Crack detection

We can find crack in Titanium material by using surface crack detection method, if possible what frequency set......

 
 Reply 
 
Josh de Monbrun
Engineering, NDT Level III / Commercial Diving Supervisor
MISTRAS, USA, Joined Jul 2016, 3

Josh de Monbrun

Engineering, NDT Level III / Commercial Diving Supervisor
MISTRAS,
USA,
Joined Jul 2016
3
23:28 Jul-23-2016
Re: Crack detection
In Reply to Karthikeyan at 12:32 Jul-23-2016 (Opening).

Karthikeyan,

You can inspect Titanium materials with both LW & SW, but you should approve a procedure with your client first. The velocity of sound in Ti is very similar to Carbon Steel (Ti: 0.2400 in/sec or 6100 m/sec). The frequency ranges used will be dependent upon the thickness of the material in which you are inspecting.

If you are only concerned with surface breaking cracks, perhaps you should look at doing ACFM (Alternating Current Field Measurement) instead. Much faster inspection technique, with fewer preparation considerations.

 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
08:11 Jul-24-2016
Re: Crack detection
In Reply to Josh de Monbrun at 23:28 Jul-23-2016 .

He probaby meant us in ECT.

 
 Reply 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 307

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
307
07:59 Jul-25-2016
Re: Crack detection
In Reply to Karthikeyan at 12:32 Jul-23-2016 (Opening).

If it is Titanium, I would suggest Liquid Penetrant Inspection, using Fluorescent materials. This is ideal for surface breaking defects.

Godfrey

 
 Reply 
 
John Hansen
Director, - Eddy Current Technology
ETher NDE Ltd, United Kingdom, Joined Oct 1999, 74

John Hansen

Director, - Eddy Current Technology
ETher NDE Ltd,
United Kingdom,
Joined Oct 1999
74
11:12 Jul-25-2016
Re: Crack detection
In Reply to Karthikeyan at 12:32 Jul-23-2016 (Opening).

Assuming this is Eddy Current you are referring to then I would recommend at least 6MHz and ideally 10MHz.

Rgds


John Hansen
ehternde.com

 
 Reply 
 

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