Re: [MW:14323] Rust on SS welded joints

Dear Sam,
It looks that during initial welding very large quantity of spatters
might have been produced and the removal of such spatters might have
not been done properly and trace of left out spatters are likeky to
create problem in corrosive atmosphere.
If the vessel was not produced in a bay dedicated for SS equipments,
grinding dust might have got deposited on the vessel under
question.Buffing by non magnetic buffing wheel follwed by pickling
should serve the purpose.

P.S.Karanth

Mob: 98251 29987
On 5/19/12, samuvel masilamani <samuvel.masilamani@gmail.com> wrote:
> 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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