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Technical Discussions
Rudolf Chyla
R & D, NDT
Railways of the Slovak Republic (ZSR), Slovak Republic, Joined Nov 2000, 1

Rudolf Chyla

R & D, NDT
Railways of the Slovak Republic (ZSR),
Slovak Republic,
Joined Nov 2000
1
18:05 May-19-2009
PA testing thermit weld of rails

Has anyone had any success with testing thermit weld of rails using phased array?

    
 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 520

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
520
08:30 May-20-2009
Re: PA testing thermit weld of rails
In Reply to Rudolf Chyla at 18:05 May-19-2009 (Opening).

zoom image


Above was at 2MHz (keyboard sticky)

I did some trials on this about 4 years ago, Usuing a MHz, 24 Element transducer

Found that
1) The 'noise image' from a good weld was clearly distinguishable
2) Side drilled holes around 3mm gacve a good response.

So it all looked very encouraging. Unfortunately we never persuaded any of the Railways to buy one, So it never got seriously field tried, and there was not opportunity to find defects with the technique.

attached overlay image should give some idea.
    
 
 Reply 
 

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