Limesh,
Matching chemistry to Inconel-625 is typically E/ER-NiCrMo-3 weld metal, while for Inconel 600/601/690 Inconel-82/182 electrodes ( E/ER-NiCrFe-3) are recommended. The details posted in your query below looks a bit mixed up.
Both the alloys are user friendly, provided surface cleanliness is well maintained throughout the process.
Typically cracking in Inconel or Nickel base alloy overlay and subsequently in the weld groove can happen due to:-
1. Iron Dilution from base metal-which could be minimised through controlling the welding parameters and lowering heat input, especially for the first pass. Manual GTAW being slower in speed that other welding processes and the deposition of weld metal being less in volume compared to SMAW or GMAW, would generally cause more Iron Dilution.
2. Carbon, Sulphur and Phosphorous dilution, generally the steel manufacturers keep these elements very much under control. But if by chance they're high, a one buttering layer with matching electrodes (e.g. ER-80SB2Lor E-8108B2L) followed by 2 layers of Inconel buttering would be of help.
3. If you're performing straight Inconel buttering by GTAW, depending on the deposition thickness asked for in the specification it would be advisable to perform the same in 2-3 layers at least. This would help to reduce the "Iron" and other elements very much to the AWS specification requirements (SFA 5.14 or 5.11).
If the problem is persistent then the advisable route would be:-
1. Perform PMI on the overlay, by Portable Spectroscopy Metorex Arcmet or equivalent to detect the above mentioned elements. XRF can detect "Fe" but can not detect these elements.
2. If these elements are well within specification, proceed to weld as suggested in the attached electrode spec, i.e Alloy 625/E-NiCrMo-3.Do not weld Alloy 625/E-NiCrMo-3 buttered WEP with E-NiCrFe-3 electrodes, it's not advisable. In a Nickel base alloys introduction of more and more alloying elements would cause lowering the melting point and would lead to cracking due to shrinkage stress during welding.
I hope this would help you. In addition you may find the extract from special metals literature as quite educative.
Thanks
Pradip Goswami,P.Eng.
Welding & Metallurgical Engineer/Specialist
Ontario Power Generation Inc.
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sunil mani
Sent: Monday, July 05, 2010 2:10 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:5861] Re: Cracking F-11 material
Hi All,
1. Welding process - GTAW
2. Welding was being made in the vertical position (fixed - 2G position)
On Mon, Jul 5, 2010 at 9:48 AM, JASPAL SINGH <jaspaldhesi@gmail.com> wrote:
Hello Dear,
This is common problem while we are going for the welding with
Inconel.
-- Let me know some more details
-- Welding Process
-- Welding Position
Cracking Phenomenon: As you have buttered the surface with
ENiCrMo-3( Inconel-625), which is having high yield point, While
ENiCrFe-3 is having low yield point and commonly cracks from
centerline while solidification takes place. The bead shape should be
convex in nature. Flat and concave bead in inconel is crack.
In future you can butter with ENiCr-3 or ENiCrFe-3 and butt weld with
ENiCrMo-3. Actually Mo adds the more resistance to yielding. Instead
of V you can change the joint configuration to U type.
Hope the same will help you out to solve the problem.
Best Regards
Jaspal Singh, CWI-AWS, CSWIP-3.1
Assistant Manager – Welding Technology
Process Equipment Division
ISGEC, Yamuna Nagar, Haryana -135001
Phone: 911732307389
Ext: 391 Mb: +91 9996624244
On Jul 4, 7:49 am, limesh M <limes...@gmail.com> wrote:
> Hi,
>
> Sorry I forgot give some additional information. Preheating was done at 200
> deg C on F11. Material thickness at the weld joint was 21 mm.
> I do not know why the cracks were coming up in the weld joint just after
> welding few mm of length.
> Any idea ?
>
> Thanks and Regards,
>
> Limesh
>
>
>
> On Sat, Jul 3, 2010 at 10:20 AM, limesh M <limes...@gmail.com> wrote:
> > Dear All,
>
> > While welding of nozzle to nozzle joint (nozzle material F11 - bevels
> > buttered with Inconel 625) with ERNICr-3, we find cracks. What can be
> > the probable causes and how we can eliminate it?
>
> > Thanks and Regards
>
> > --
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> > w.r.t. applicable code/standard/contract documents.- Hide quoted text -
>
> - Show quoted text -
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.
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