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Technical Discussions
vijayaraghavan P
Consultant,
Freelance consultant, India, Joined Dec 2009, 12

vijayaraghavan P

Consultant,
Freelance consultant,
India,
Joined Dec 2009
12
11:04 May-25-2012
Digital radiography of castings

We are in the process of procuring “Digital Radiography system “ (Real time Digital Radiography system comprising Flat panel + Soft ware + C arm manipulator ) for radio graphic Inspection of Al & Mg alloy Castings.

Most of the company procedures mention " Non film techniques shall be of comparable or better sensitivity, than conventional film radiography for each part under consideration " which is general and does not provide any technical in put.

Can you please share your experience or refer who have experience in Digital Radiography system “ (Real time Digital Radiography system comprising Flat panel + Soft ware + C arm manipulator ) for radio graphic Inspection of Al & Mg alloy Castings.

 
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John Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 162

John Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
162
04:25 May-26-2012
Re: Digital radiography of castings
In Reply to vijayaraghavan P at 11:04 May-25-2012 (Opening).

My last experience with digital radiography of castings was a couple of years ago, and I hope the equipment is continuing to improve. I was disappointed most by the difficulty in imaging shrinkage well because of the variation in both dimension and density in "feathery" discontinuities. I found DR to be much better than CR for this. It is extremely important to put limits on image manipulation by the individuals evaluating the castings. It is hard to learn how to compare reference images on film with digital images of discontinuities. Shooting a good number of castings with discontinuities using booth film and solid state imaging really helps inspectors learn to make the transition. In spite of having theoretically fewer shades of gray available, I really liked C-MOS digital systems because of the greatly reduced scatter compared to amorphous silicon panels, and especially compared to CR. Laser scanner maintenance is very important with CR. I had hoped for years to be able to view on-line digital x-ray images of castings while they were still at the foundry so that only the good ones could be shipped to us. It never happened. Now I am no longer concerned with this, but you have reminded me of the disappointments.

 
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