Re: [MW:24007] Iron Dilution in 70-30 Cu-Ni W.D. on P-No. 1 Base Metal.

Dear Experts,

Welding Process is GTAW- Manual. Barrier layer with 1.6 mm. Dia. ERNi-1 and subsequent two layers with 1.6 mm. Dia. ERCuNi. Preheat temp. is ambient temp. and maximum Interpass temp. is 96º C. HI for barrier layer is 1.543 KJ/ mm. Tungsten Electrode Dia. 2.5 mm. 2% thoriated, Technique String bead.

I think it is very difficult to achieve undiluted chemistry at 1 mm. from fusion. Now, my concern is client's DS are silent about undiluted chemistry. It has specified only 3 mm. 70-30 Cu-Ni W.D. and strength design of the components is done by client considering 3 mm. W.D. Client's spec. speaks that Minimum thickness of undiluted finished weld overlay from top shall be 2 mm. or as specified in the drawing. What does it mean? In MDS 3 mm. W.D. is specified means at 3 mm. from fusion line, undiluted chemistry shall be achieved?

Now, it is matter of an interpretation.   

Thanks & regards,

C. R. GANDHI

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From: Joseph <nithindsilva4u@gmail.com>
To: materials-welding@googlegroups.com
Sent: Friday, December 25, 2015 10:55 AM
Subject: Re: [MW:24004] Iron Dilution in 70-30 Cu-Ni W.D. on P-No. 1 Base Metal.

Hi,

You have to give full details like what was the no of layers, total height of cladding and what welding process was used for PQR etc.

When doing cladding, first layer will always be diluted. In your below email you have specified that you achieved undiluted chemistry at 3mm from weld interface. And client requirement is 2mm undiluted chemistry from top. In order to achieve this your welding should be 3mm (where you have achieved undiluted chemistry + 2mm minimum (client requirement) deposition.

Sent from my iPad

On 24-Dec-2015, at 15:03, 'Prakash Hegde' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Hi!

It is very difficult to achieve at 1mm from fusion line the undiluted chemistry unless you go on grinding of layers at least twice which is not a good proposal in such case you qualify the PQR with utmost precaution of overlap and heat input and  get the approval from client .

Regards

Hegde

On Wednesday, 23 December 2015 4:14 PM, Vanchinath S.A. <vanchinaths@gmail.com> wrote:

If you are analysing by spectro it should meet at 1mm. Otherwise you take chips from 1mm to 3mm and analyse the chemistry and prove it meets the requirement. In my opinion 5mm WD is required to meet 2mm undiluted weld.  Vanchinath

On 23 Dec 2015 15:52, "'CHINTUKUMAR GANDHI' via Materials & Welding" <materials-welding@googlegroups.com> wrote:

Dear Experts, 

Greetings of the day. 

 I need your expert advise on an issue. In one of our project, 70-30 Cu-Ni W.D. to be done on P-No. 1 base metal. As per client's Data sheet, 3.0 mm. W.D. is specified. Accordingly we have qualified WPS to get the undiluted chemistry on 3 mm. W.D. from interface as per ASME Sec. IX. But in client's project spec. it is specified- "in case a higher deposition thickness and multiple weld layers are required to achieve the minimum specified undiluted deposit metal, the same shall be done only after taking prior approval of client. Minimum thickness of undiluted finished weld overlay from top shall be 2 mm. or as specified in the drawing. Now, my concern is shall we have to certify undiluted chemistry at 1 mm. from fusion surface considering (3 mm. required W.D. as per Data sheet - 2 mm.) or at 3 mm. viz. top surface. 

Please revert at the earliest. 

 Thanks & regards, 

 C. R. GANDHI

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