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Technical Discussions
Asif
NDT Inspector, -
Pakistan, Joined Jul 2008, 7

Asif

NDT Inspector, -
Pakistan,
Joined Jul 2008
7
10:07 Nov-24-2009
ultrasonic testing of 25mm steel rod

Does any one like to shear Methods for ultrasonic testing of 25mm steel rod?

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
13:47 Nov-24-2009
Re: ultrasonic testing of 25mm steel rod
In Reply to Asif at 10:07 Nov-24-2009 (Opening).

Hi Asif

Is the bar of 25mm diameter? what length? what is the expected defect to give cause for consideration of full UT?

A comprehensive shear wave inspection of a 25mm diameter steel bar would be a very costly exercise involving radiusing a probe. Is there a justification for this? Would MPI not suffice for surface flaw detection?

    
 
 Reply 
 
Sang Kim
Consultant, NDT Trainer
Guided Wave Analysis LLC, USA, Joined Feb 2008, 44

Sang Kim

Consultant, NDT Trainer
Guided Wave Analysis LLC,
USA,
Joined Feb 2008
44
17:25 Nov-24-2009
Re: ultrasonic testing of 25mm steel rod
In Reply to Nigel Armstrong at 13:47 Nov-24-2009 .

Hello! Asif,

The steel rod testing using ultrasonic guided wave was commercialized. We are using two different guided wave -- the fundamental torsional mode and longitudinal mode, L(0,1). The fundamental torsional wave is exactly the same to bulk shear wave in wave velocity, particle displacement, and non-dispersive characteristics. The fundamental torsional mode has strong particle displacement on the rod surface so that it is very good for finding defect in rod surface. But it has geometric attenuation due to different particle displacement in rod center and surface that increases the wave attenuation so that its inspection range is about 10 meters. The longitudinal mode is mostly used for long-range rod inspection up to 100 meters if it is not buried in soil or not much corrosion on rod surface. The longitudinal-mode guided wave testing is used for finding corrosion of buried 10-ft-long and1-inch-OD rod or 8-ft-long and 0.75-inch-OD rod. It was proven with many field testing and excavation.

The guided wave technique is also used for inspecting heat exchanger tube, steel rod, steel beam, bridge cable, steel plate, and pipeline. For the detail information, please see the following website (http://www.gwanalysis.com/buried_anchor_rod.html) or contact me.

Sang

    
 
 Reply 
 
David Harvey
Engineering
ATI - Wah Chang, USA, Joined Nov 2002, 42

David Harvey

Engineering
ATI - Wah Chang,
USA,
Joined Nov 2002
42
18:51 Nov-24-2009
Re: ultrasonic testing of 25mm steel rod
In Reply to Asif at 10:07 Nov-24-2009 (Opening).

Is the bar installed in a component, or is this bar as being manufactured? What is the length of the bar, and what is its surface condition?

The "state" of the bar will dictate how you can test it. With a bit more detail for the group, I am confident you will get an answer that can help you. But without more specifics, we are just guessing.

    
 
 Reply 
 
Randy Plis
Sales, Consultant
AMDATA NDE Technology LLC, USA, Joined Oct 1999, 23

Randy Plis

Sales, Consultant
AMDATA NDE Technology LLC,
USA,
Joined Oct 1999
23
01:07 Nov-25-2009
Re: ultrasonic testing of 25mm steel rod
In Reply to Asif at 10:07 Nov-24-2009 (Opening).

Hello Asif,

As with other respondents, knowing what you are inspecting is the key to recommending how to inspect it. For example, if the rod is raw material that with be later cut and machined into a finished part, there should be an industry or designer related standard and specification that spells out what you are looking to detect.

My experience in this area has been to perform UT immersion on such bar as raw material for aerospace components. In that case, the typical inspection is to detect indications running in the axial direction using a zero degree oriented probe. Setup on a bar cal standard to a standard defined flat bottom hole.

Shear wave is instead typically used if looking for cracks, such as occur from inservice use.

Cheers,
Randy Plis

    
 
 Reply 
 

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