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Re: [MW:17498] Re: Radiography aerospace M250 welds

By Materials & Welding
Sir,

Fabricator feels that as 10ISO16 wire is seen in both the films, will we miss a defect more than this size in D4. As you have suggested we are consulting the designer and working out options without repair.

Regards

Mohan

On Sat, 20 Apr 2013 01:08:26 -0700 (PDT), SV Swamy wrote
> If I remember right D2 is a slower finer grained film. Thus it may show some fine indications missed by D4. You can switch to D2 but you may find such indications and would have a problem deciding whether to leave them alone (and monitor them later in service if possible) or repair them. Repair may sometimes worsen and introduce more discontinuities. 
>
> Better discuss with designer if possible before switching. 
>
> Swamy
> Retd. QA Metallurgist
> Nuclear Fuel Complex, Hyderabad
>
> On Friday, April 19, 2013 12:10:35 PM UTC+5:30, Mohanananthanarayanan KR wrote:
Dear all,
>
> As per specification we have D4 film to be used for radiography of 7.8mm welds
> of M250.As an investigation of a defect in UT D2 film was used and it detected
> faint indications. The sensitivity IQI is seen in both the films as per
> specification. Should we change to D2 film?
>
> Regards
>
> Ananthanarayanan
> Trivandrum
>
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