Re: [MW:17489] Re: Radiography aerospace M250 welds

Dear sir,

                      D4 would be more suitable which is slow and reveal tiny discontinuities more visible and may be required longer exposure time needed  than for D2 .

regards

Kichu

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From: SV Swamy <svswamy@gmail.com>
To: materials-welding@googlegroups.com
Cc: krm_ananthanarayanan@vssc.gov.in
Sent: Saturday, 20 April 2013, 12:08:26
Subject: [MW:17477] Re: Radiography aerospace M250 welds

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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