Saturday, April 17, 2010

Re: [MW:4835] Radiographic film interpretation

This is acceptance rejection criteria for film quality and not for the weld quality.

our friend seek advice for acceptance rejection criteria for weld quality based on radiographic density.

originally mentioned indication is most probably gas voids filled with some dense materials etc

Regards, Bhaskar

On Fri, Apr 16, 2010 at 3:55 PM, Sam Malemela <smalemela@spc.co.za> wrote:

Hi Shashank,

 

There are guidelines for acceptance of developed film density depending on the Code you are using. Some codes are calling for 1.8 - 4.0 being acceptable density ranges within which reasonable interpretation and disposition of imperfections can be executed safely.

 

Some codes however call for a Radiographic film density of 2-3.

If you are interpreting to a code of specification, make your ruling within the parameters provided for in the Governing code of specification.

 

The bottom line is whether the image you are looking at is reasonably visible to your eye aided or not to enable you to Accept or Reject it? Can you see what you are expected to see without any doubt that the image is not good enough to enable you to make a decision.

 

The densities you are providing are within the range for 1.8 – 4.0.

 

Regards,

 

NS MALEMELA

Contracts & Quality Manager [Special Projects]

Southern Pipeline Contractors

TEL:(011) 914-8519

FAX:(011) 914-4524

082 389 2592 Cell

smalemela@spc.co.za

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Declan Foley
Sent: Thursday, April 15, 2010 10:59 PM

Subject: Re: [MW:4819] Radiographic film interpretation

 

Never heard of one. I'm sure there are plenty of people on this forum like me who have vast experience of viewing & interpreting radiographs. Any chance you could take a photo (of the radiograph) and post it here?

Declan

On 15/04/2010 15:46, Shashank Vagal wrote:

Hi all,

In one RT film we have a 10-12 mm spot with density 3.13. The weld density is 3.17 and the parent metal density is 3.3. It is apparently interpass LoF in the 2nd fill pass after hot pass (confirmed by UT, where the indication ht is approx 20%of DAC). Is there any or what is the criteria for acceptance/rejection based on density difference?

Rgds,

Shashank Vagal


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