[MW:5153] Re: MW: 5137- Copper Nickel weld overlay

Dear Pradip,

Thank for your advice.

PQR what i m qualifying is GMAW (Automatic) process. Parameters are
as follow:

A- 130-140
V - 20.5
S - 500 mm/min
Wire Feed - 6 m/min

The purpose is internal pipe overlay.
Initially ERNi-1 is used as per manufacturer recommendation. But due
to high Ni, ERCuNi is being welded.

By today, Ni content is satisfied but Fe is still 1.02 at 3 mm above
the fusion. 3 layers welding is not prefer because required weld
thickness is 3 mm.

Regards,

Bogyi

On May 12, 8:55 am, "pgoswami" <pgosw...@quickclic.net> wrote:
> Hi Bo Gyi,
>
> Following is the Cupronickel GTAW/GMAW undiluted overlay composition as per
> ASME Sec-II Part-C.I have highlighted the critical elements FYI.
>
> .         Fe-0.40 -0.75 %
>
> .         Ni-29.0-32.0 %
>
> .         Mn-1.00 max
>
> .         Cu-Rest
>
> What was the value of "Fe" and "Ni" noted in the final analysis in the test
> report.
>
> The "Ni" content in the final analysis would be higher die to fact that
> ER-Ni1 (Pure Nickel) barrier layer is used. However the Nickel level could
> be brought down and "Fe" dilution could be reduced in  couple of ways:--
>
> .         Increase the no of passes. If it involves 2 passes of ER-CuNi
> (including the barrier layer) increase no of  passes to 3,(2 CuNi+1 Pure
> Nickel barrier) this  would reduce the dilution and reduce the Nickel
> content and "Fe".
>
> .         Or check your welding parameters, to control the dilution (lower
> penetration) for the first pass. Dilution is maximum in the barrier pass.
> The common ways are to decrease current, and adjust travel speed and welding
> technique.
>
> .         Check the "composition  of the undiluted weld metal from
> manufacturer's test report. Both for ERNi-1 and ER-CuNi. If "Fe" level is
> high to start with, then this consumable could  pose problems.
>
> Hope this would help you in solving your problem.
>
> Thanks.
>
> Pradip Goswami,P.Eng.
> Welding & Metallurgical Engineer/Specialist
> Email-pgosw...@sympatico.ca <mailto:sympatico.capgosw...@quickclic.net> ,
> pgosw...@quickclic.net
>
>  Subject: -----Original Message-----
>
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of bo gyi
>
> Sent: Monday, May 10, 2010 11:41 PM
>
> To: Materials & Welding
>
> Subject: [MW:5137] Copper Nickel weld overlay
>
> I have encountered that Ni & Fe content are too high for two layers of
> ERCuNi overlay to SA106 Gr.B. When I use ERNi-1 as buffer layer, Ni% much
> more higher than without buffer. Can anyone give me some advice?
>
> Regards,
>
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