Re: [MW:13836] Metallographic test

Hello,

It is clear that our friends are not aware of the insitu metallography unit (polishing & etching). Commercially available techniques are available. There is no need to cut the job, we can do metallography analysis on the engineering component itself. It is being used for in-service inspection also. We can do spot polishing & etching at a particular location of interest. Ofcourse during prepartion of the surface for in-situ optical microscopy, few micron layers are removed. The replica obtained from the particular location (after gold coating to enhance the contrast) can be analysed in detail using optical microscope & also using Scanning Electron Microscope at Labs. Insitu-metallography is also classified as one of the non-destructive techniques.

All the best,

Thank you,

Best Regards,

Vaidehi. G

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----- Original Message -----

From: peyman hafezi

To: materials-welding@googlegroups.com

Sent: Tue, Mar 06, 12 12:41

Subject: Re: [MW:13835] Metallographic test

Dear Friend
Actually metallography is a destructive test. How can anyone do metallography on main job or welding? For metallography you have to make a sample of welding or metal by cutting it and bring the sample to lab.
Besides, in this test the surface of sample is being etched by a weak acid! So something like corrosion occurs on the surface!
As a metallurgist I'm going to say that Metallography is a Destructive test.
Regards

On Tue, Mar 6, 2012 at 9:29 AM, I.K.Inspection Services <ikinspection@gmail.com> wrote:

Dear experts,

 

           I knew the Macro and metallographic examinations are destructive tests and even it is given in the TWI books but a friend of mine who tells these are NDT. Could someone clarify about this? Is both macro and metallography same?

 

regards

IK

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