Re: [MW:13872] Groove Welds on Corrosion Resistant Weld Overlay

Normally the CRA (WOL) not considered in design calculation bt may be included. (ASME SEC 8 D1 UCL-26 pg225)

To confirm that clarify with the design engineer.

Gerenate new WOL (WPS) SMAW with PWHT process to weld the internal (When De-clading required to weld the internals) (buffer layer with E309 + E316L15/16 or 17) .Go for min thk of the vessel so that it can qualified up to unlimited.(Table-QW453 pg 150)ASME sec 9. If de-cladding not required go for normal groove weld/ fillet weld WPS with PWHT.(base on Clad -thickness) no need to consider the base metal (CS) thickness.(QW-217 pg18)

 

Kavin Murugam

0126159644

From: Ramin Kondori <raminkondori@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, March 11, 2012 2:46 AM
Subject: Re: [MW:13860] Groove Welds on Corrosion Resistant Weld Overlay

Dear Prashant:

In these cases just forget about the code and make an engineering
judgement (which acc to the code itself, a sound engineering judgement
is a better approach to solve the problem).

You have a 6mm thick overlay
The weld will penetrate the base metal (316 layer) for about 2-3 mm, not more
The HAZ of this weld will be 1-2 mm and will not include any portion
of A516 shell plate

So this weld will not affect the A516 that much and the only parameter
that you should consider is the heat sink (high cooling rate) of this
weld that since the weld metal is of austenitic type, it won't hurt.

So you can proceed with a simple butt weld between 316 plates of 6mm
or same as internal plate thickness.

Ramin  Kondori
IIW-qualified Welding Engineer
(IWE AT 0070)



On 3/10/12, Prashant Shelar <pshelar@lamprell.com> wrote:
> Hi All,
>
> My query is as follows:
>
> Shell thickness is 100 mm and material grade is SA 516 Gr.70. There is 6 mm
> SS316L Weld Overlay on Shell done with ESW process using a qualified WPS.
> After PWHT of the vessel, there are some SS316L internals are to be welded
> on the cladding done in the shell. Types of the joints considered on the
> cladding are Groove & Fillet welds.
>
> Consider the two cases:
>
> a)      Suppose the cladding thickness is considered in the design
> calculations.
>
> The WPS used for supporting the welding of the internals on the cladding
> after PWHT shall be supported for the combined thickness of shell and
> cladding & thickness of internals or shall consider only the thickness for
> cladding & thickness of internals?
>
> b)      Suppose the cladding thickness is not considered in the design
> calculations.
>
> The WPS used for supporting the welding of the internals on the cladding
> after PWHT shall be supported for the combined thickness of shell and
> cladding & thickness of internals or shall consider only the thickness for
> cladding & thickness of internals?
>
> Do we have any ASME interpretations for WPS/PQR of such groove welded joints
> coming on the cladding portion of the shell?
>
>
> Thanking you,
> Rgds,
>
> Prashant
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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