where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

733 views
Technical Discussions
Hermann Wuestenberg
R & D
BAM Berlin, Germany, Joined Nov 1998, 26

Hermann Wuestenberg

R & D
BAM Berlin,
Germany,
Joined Nov 1998
26
06:50 Jun-11-1998
railroad wheel testing

Railroad wheel rim testing:

The ultrasonic inspection for possible cracks at the railroad wheel rim must take into account the
multitude of crack positions, orientations and depth´s as described by Mr. Hintze´s contribution.
A reliable detection of those cracks with a low false call rate requires a multitude of ultrasonic
beam directions and different physical interactions. We should therefore consider all available methods of the generation and reception of ultrasonic waves and not restrict the solution of this important problem
to contactless transducers like the EMAT´s. It could be possible that the standard probe techniques with
liquid couplants are offering much better adaptability to some of the problems than the EMAT´s.
Beam focussing, small beam divergence, frequency bandwith and high near surface resolution, multimode probes are some of the aspects to be considered. If at an in situ rim testing one has to choose a multiprobe concept for a future automatic UT-inspection system - eg. 2 x 64 probes imbedded into two 4 to 6 m long test rails - there are certainly some severe advantages on the side of the traditional contact probes. The real advantages of the EMAT´s - to be contactless and to enable the use of shear horizontally polarized shear waves - must be compared with the restrictions concerning e.g. the frequency, the sound field structuration and the cost, if a multiprobe concept has to be considered.
Another aspect is the separate evaluation of the basic potential of a NDT method for the given task and the problems in connection with it´s application under practical circumstances. Both aspects are of course influencing the decision for the one or the other approach. E.g. the eddy current technique with a strong magnetization has apparently some attractivity. But is there also a possibility to modify it´s applicability to a degree that it complies with the requirements of an in situ automatic inspection?



    
 
 
Hassan Rahimi
Hassan Rahimi
00:20 Jun-19-2000
Re: railroad wheel testing
inspection system - eg. 2 x 64 probes imbedded into two 4 to 6 m long test rails - there are certainly some severe advantages on the side of the traditional contact probes. The real advantages of the EMAT´s - to be contactless and to enable the use of shear horizontally polarized shear waves - must be compared with the restrictions concerning e.g. the frequency, the sound field structuration and the cost, if a multiprobe concept has to be considered.
: Another aspect is the separate evaluation of the basic potential of a NDT method for the given task and the problems in connection with it´s application under practical circumstances. Both aspects are of course influencing the decision for the one or the other approach. E.g. the eddy current technique with a strong magnetization has apparently some attractivity. But is there also a possibility to modify it´s applicability to a degree that it complies with the requirements of an in situ automatic inspection?




    
 
 

Product Spotlight

NEW! The PragmaPro Instrument Platform

The PragmaPro is based on a modular cartridge technology and supports various NDT instrument modal
...
ities such as UT, PAUT, ECT and many more. This new platform is based on a machined, powder-coated aluminum frame for shock-proofness, best sealing qualities and maximum heat dissipation. This is practical to extend the outdoor temperature range and/or to extend the power injected in the transducers. The PragmaPro is aiming at a very wide range of applications, such as weld scanning, corrosion mapping and composite testing.
>

GUL QSR1® Scanning

How do you measure pipe wall thickness without direct access to the area? QSR® Scanning - Guide Wav
...
e Quantitative Short Range Scanning.
>

HD-CR 35 NDT Computed Radiography System

Portable high-resolution CR scanner for all radiography applications - weld testing, profile images
...
and aerospace. No matter what type of radiographic testing you are performing, the unique TreFoc Technology of the HD-CR 35 NDT imaging plate scanner always guarantees the highest image quality.
>

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT applications.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window