Pls find attached useful document for Pickling & passivation.
Thanks
Mohamed
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of samuvel masilamani
Sent: 19 May 2012 08:58
To: materials-welding@googlegroups.com
Subject: [MW:14310] Rust on SS welded joints
Dear Experts,
we are facing a problem in SS welded joints. most of the joints are found rusted ( layer of rust) after 2 months duration. we checked for the wrong usage of grinding discs,power brush. but everything was found ok.Then we checked PMI, then ferrite test as requested by the client and the results were positive.The pipe material is TP316L, the filler wire usedis ER316L, Electrode E316L-15
we proposed the Pickling & passivation as the only solution ,but client is still not satisfied.Is there any other possiblity for the rust formation? Is the redrying temperature& time have any effect on the chemical composition change?
kindly clarrify
Regards,
Sam
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