[MW:22446] RE: 22434] Clad 625 - Minimum number of layers

Hello Vijay,

 

If you perform a search in the materials-welding group forum with the topics mentioned below, there will be tons of queries and answers. Regarding the overlay , no of passes, 2 or 3  is not important.What matters with Sec-IX is qualifying thickness.

 

Alloy composition at 3 mm height( from the interface) will qualify alloy composition at 5mm height, since the dilution effect is lessened as one goes up from the interface. typically  3 layer deposition is more even and uniform(wrtto chemistry) than 2 layer deposit.

 

Fe dilution is a key issue on 625 OL. 5% Fe at 3mm of qualifying height is possible, provided:- the welding consumable has less "Fe" in in diluted condition also welding parameters( especially in barrier layer) are well controlled. The last part (welding parameters) is an actual scenario, can concluded by book. However if you're meeting Fe-5% at 3mm qualifying height then for 5mm deposit it should not be a problem at all.

 

Thanks.

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

http://ca.linkedin.com/pub/pradip-goswami/5/985/299

 

625 OVERLAY , in Materials & Welding

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vijay.Tayade@akersolutions.com
Sent: Tuesday, December 02, 2014 12:59 AM
To: materials-welding@googlegroups.com
Subject: [MW:22434] Clad 625 - Minimum number of layers

Hi All,

 

If a cladding on C-Mn steel is qualified for 2-layers with minimum thickness of 3mm(Chemical Analysis : FE content meets the requirement of “FE 5” at 3mm from fusion line), is this qualification, valid for production cladding where minimum 3layer is requirement(as per client specification)?

The required clad thickness to be achieved on production cladding is 5mm as minimum with 3 layer.

 

Please provide your view whether the 2 layer cladding qualification is suitable to perform 3 layer clad.

 

Best regards,
Vijay Tayade
Welding Engineer | Materials Technology
Aker Solutions

Tel: +91 20 6691 8929 (60 18929) |  Mob: +91 9960599789
vijay.tayade@akersolutions.com  |  www.akersolutions.com
 
Aker Powergas Subsea Pvt Ltd
Visiting address: IT-2 Blue Ridge SEZ, Hinjewadi, 411057 Pune, India
Registered in India, CIN : U74990MH2010PTC210736
 

 

 

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