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Teletest
Teletest Focus+ was the first system to use long-range guided wave ultrasonic testing to detect corrosion in pipelines.
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RocketJam
Canada, Joined Jan 2013, 13

RocketJam

Canada,
Joined Jan 2013
13
11:20 Sep-08-2014
Shot blasting before PT

At my current employer, it is common practice to shot blast forgings with AL Oxide, and wipe down with an aerosol cleaning spray. I'm not well experienced, but wouldn't the blasting peen the surface?

Any suggestions?

 
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anjafo79
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo79

NDT Inspector
Norway,
Joined Aug 2009
204
19:00 Sep-08-2014
Re: Shot blasting before PT
In Reply to RocketJam at 11:20 Sep-08-2014 (Opening).

There is reference material on this if you search and its stated in a spec (cant recall which) that it shouldn't be done. I think if you must do it this way you have to qualify the technique by doing tests on similar items with known defects to see if they are hidden post shot blasting.

 
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Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
19:32 Sep-08-2014
Re: Shot blasting before PT
In Reply to RocketJam at 11:20 Sep-08-2014 (Opening).

Though you probably think you only raised one point, in fact you raised two.

On your point regarding shot-blasting, it would be OK if they were acid etched afterwards to remove any surface "smeared" material.

The second point is "wipe down". This really should not be done because of lint or threads from the wiping material. After blasting, HFl etch, hot rinse, dry and then penetrant application and processing.

 
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