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Technical Discussions
Nirav Dave
NDT Inspector,
Company, India, Joined Jul 2014, 11

Nirav Dave

NDT Inspector,
Company,
India,
Joined Jul 2014
11
11:48 Jan-16-2015
Notch depth measurement for UT

Dear Friends

How can i measure notch depth of 0.1mm with replica method used in ultrasonic testing (immersion technique) ? what type of powder or mixer of different coumpounds are used to prepare replica?

plz let me know how to measure through replica method?

Rgs
Nirav

 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
14:55 Jan-16-2015
Re: Notch depth measurement for UT
In Reply to Nirav Dave at 11:48 Jan-16-2015 (Opening).

It has been over a decade since I've needed to make a replica, but I believe that "RTV 11" was something that I used successfully in the past. It was made by GE Silicones then, but that portion of business is apparently now known as MG Chemicals: http://www.mgchemicals.com/products/rtv-silicones/potting-compounds/rtv11/

If the block is not too massive, and you have access to the equipment, it is not uncommon for an inverted metallurgical microscope to have an ability to measure depth by noting the number of tick marks as you change depth of focus. You would first focus on the exterior surface, zero your tick mark reference, and then focus at the bottom of the notch.
Regards

 
 Reply 
 
Dave Utrata
Dave Utrata
17:26 Jan-16-2015
Re: Notch depth measurement for UT
In Reply to Nirav Dave at 11:48 Jan-16-2015 (Opening).

I have recently used Microset successfully. Here's there company site: http://www.microset.co.uk/
although I used a local vendor.

The dimension of the replica will still have to be measured, and presumably you have access to a calibrated microscope for that.

As Rick pointed out, another method could be using optics and focusing on the surface, knowing the vertical displacement of the device, and focusing on the notch bottom.

 
 Reply 
 

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