Re: [MW:28126] CRITERIA OF CLAD THICKNESS

 Dear Ramin.

How is it going?I am so glad to hear you.

You are right that 625 has a specific range for all elements(especially Mo/Cr/Ni) but you know better than me that your mentioned instruction have to be said in project documents and if not be said contractor can not do it or claim inspector and only measurement given is Fe content under just 1mm final layer and we only supplement G28.

And let me remind you, this is cladding of base metal not joining.

Regards.

On Tue, Jul 24, 2018 at 1:31 PM, Ramin Kondori <raminkondori@gmail.com> wrote:

Dear Ali:

The clad material (625 Inconel) has specific acceptable ranges for each element.

You have to conduct chemical analysis on different depths; first the root pass surface; second on the depth corresponding to the surface of pipe (grind the root flush to the internal surface of the pipe); the third point shall be 3 mm below the surface (if you have 3mm of Inconel cladding) and at this point, the concentration of all elements shall be at the Inconel 625 specified range (this is the most important measurement). If they fail to meet chemical analysis requirements then you have to modify your welding procedure.

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

On Mon, Jul 23, 2018 at 6:54 PM Ali Asghari <asgharialigl@gmail.com> wrote:

Dear All.

Does anybody know about how a designer calculate the thickness of clad material especially for sour service and how much is conservative?

because in our project documents have not said clearly that thickness of clad have to be measured from base material or from layer that dilution is negligible and this question remained does designer account or consider dilution or not?

Regards.

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