Wednesday, May 12, 2010

[MW:5148] MW: 5137- Copper Nickel weld overlay

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-pgoswami@sympatico.ca,
 

 

 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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