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 -

599 views
Technical Discussions
Atul Deulgaonkar
Atul Deulgaonkar
07:44 May-19-2001
Ultrasonic testing of forged shaft

While testing it is observed a number of times that shafts do not give any back wall echo even at full gain and using probes of very low fequencies like 1Mhz or 0.5Mhz.
What is interpretation of this phenomenon ?


 
 Reply 
 
Anonymous
Anonymous
01:27 May-19-2001
Re: Ultrasonic testing of forged shaft
: While testing it is observed a number of times that shafts do not give any back wall echo even at full gain and using probes of very low fequencies like 1Mhz or 0.5Mhz.
: What is interpretation of this phenomenon ?
.
Try various Pulse Repitition Rates and a 2.25 MHz. Transducer.


 
 Reply 
 
Dr. Patel
R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University, Canada, Joined May 2001, 20

Dr. Patel

R & D, Consultant to Universities/Industries
Fallon Ultrasonics/McMaster University,
Canada,
Joined May 2001
20
06:44 May-19-2001
Re: Ultrasonic testing of forged shaft
: : While testing it is observed a number of times that shafts do not give any back wall echo even at full gain and using probes of very low fequencies like 1Mhz or 0.5Mhz.
: : What is interpretation of this phenomenon ?
: .
: Try various Pulse Repitition Rates and a 2.25 MHz. Transducer.

There are many reasons for that and if you can send us details on probe diameter and contact face, PRF and energy on your pulser, perhaps we can help you interprete the phenomenon. Beam divergence, contact losses, losses due to material properties etc plays a role, however, first we have to establish the sensor and instrument you are using is OK than we can deal with other problems.

Regards

Dr. Patel



 
 Reply 
 

Product Spotlight

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

PAUT Probes

Typical Phased Array probes have frequencies between 1MHz and 20MHz and the number of wafers is 10
...
to 128. M2 Electronics offers customers conventionally ultrasound probes and the ability to provide high-precision Phased Array Ultrasound Probes of up to 256 wafers. We can also customize the probe for our customers to meet the specific application requirements of the user.
>

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

Extended Range Variable Wall® Piping Calibration Blocks for Longseam Inspection

This set of two blocks has been specially designed for situations where ultrasonic examination tak
...
es place circumferentially or “around the curve” for applications such as inspection of longseam welds in piping and vessels. Jointly designed by PH Tool and Holloway NDT, the blocks feature side-drilled hole reflectors positioned within novel compound-curves, each with multiple thickness steps. The unique design results in a light and compact form factor, with the largest block weighing just over 15 lbs and spanning just 16 ¾”. Coverage is provided for nominal pipe sizes from 6” to 10” in the small block and 12” to a whopping 56” in the large block. The compound OD curves and multiple wall thicknesses actually exceed ASME requirements, providing exceptional signal response and measurement accuracy. Properly managing beam divergence off the ID and stabilizing beam skew due to probe rocking is essential to maintaining a consistent calibration when inspecting lengthwise on curved surfaces.
>

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