Groove Welds on Corrosion Resistant Weld Overlay

[Prashant Shelar]

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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[Deepak Deshmukh]

Dear Mr. Prashant,

For welding of internals, you need not consider cladding thickness as cladding thickness is not meant for any structural strength but only for necessary protection.  You should consider thickness of the shell and thickness of internals only.  Please let us know, the type of activities / job and application you are carrying out.

Thanks & regards,

Deepak Deshmukh

Mob. No. 09422103451

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[Prashant Shelar]

 

 

Dear Deepak,   This is with reference to QW 217 of SecIX, clause (a) & (b) as well. The WPS shall be supported for either of the two cases; i.e. when cladding is considered in design calculations and also when cladding is not considered in design calculations.   As per you if I am considering the thickness of the shell (i.e P No. 1) and thickness of internal (i.e. P No. 8) for developing a WPS, then it wont be appropriate as I will be ultimately welding SS internals to cladding (i.e. P No. 8 to P No. 8). Hence this creates a doubt for me and hence I am looking for a clarification regarding the same.   It would be great if we have some kind of asme interpretation for that clause which can make the case more clear.

Thanking you, Rgds, Prashant

 

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[Ramin Kondori]

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)

[Kavin Murugam]

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

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