[MW:16613] Re: MAGNETIC CHECK

The heat of welding affects the grain structure. Annealed SS316L is austenitic and is non-magnetic, the magnet would not stick there. On the weld and slightly both sides of the weld, the grain structure would be distorted and could contain some delta ferrite (a magnetic phase). 

If you really need to know the exact grain structure, get a metallographic examination done either in-situ or by cutting a small section and sending it to a metallurgical test lab. 

Regards

Swamy

Retired QA Metallurgist

On Monday, January 28, 2013 10:57:40 AM UTC+5:30, Chan, David wrote:

Hi Experts,

We have an issue where the Customer is going around on the a stainless steel (S316L) using a potable to check on the materials and welds

 

He has checked on some areas near the weldment where there is a force of attachment and the magnet is still sticking to the area

The magnet drops off when the magnet is moving away from the weldment

 

I request for a technical understanding to clarify with the customer

 

Appreciate your kind assistance  

 

Thank you

Best Regards

 

David Chan

 

Republic of Singapore

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