RE: [MW:16710] Rolling/Forming of Plug Welded Carbon Steel and Duplex Stainless steel sheets

Hi ,
 
I'm in India till 11 Feb. Can you call me @ 9830344095 to discuss.
 
Thanks
 
P.Goswami
 

> Date: Wed, 6 Feb 2013 17:12:58 +0530
> Subject: [MW:16707] Rolling/Forming of Plug Welded Carbon Steel and Duplex Stainless steel sheets
> From: pinakdutta1@gmail.com
> To: materials-welding@googlegroups.com
>
> Dear Mr. Goswami,
>
> We need to fabricate Knife Gate Valve body with 3m - 3.6 m shells of
> 30 thk Carbon Steel 516 Grade 70 internally lined with Superduplex
> Stainless steel sheels of 6mm thickness.
>
> Our Fabrication contractor insists in the following procedure
>
> 1. Rolling the shells of Carbon Steel and Superduplex Stainless steel
> seperately
> 2. Insert the shell of Superduplex SS Material into the shell of
> Carbon steel material.
> 3. Plug Weld both the shells from the inside with 10 mm plug holes.
>
> I would have thought that the flat sheets should be plugwelded to get
> a single sheet of 36 mm thickness (30 mm SA 516 Grade 70 with 6 mm
> Superduplex SS lining) and then the entire 36 mm sheet could be
> rolled. However our contractor informs that there could be problems in
> the strength of the plug weld and the joints could fail on Rolling.The
> Customers Engineering consultant also tends to agree with the
> contractor.
>
> Please could you advise the best possible procedure to make these
> lined shells of 3 m and 3.6 m diameter. I would appreciate if you
> could also send me some literature / technical articles explaining how
> these two materials could be joined before rolling.
>
> Regards
>
>
> Pinak Dutta
>
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