Materials & Welding: RE: [MW:31761] Facing crack in during overlay welding of Stellite 12 on Duplex material

Sunday, November 22, 2020

RE: [MW:31761] Facing crack in during overlay welding of Stellite 12 on Duplex material

ASTM 182 Gr.F55 is Zeron 100 forged product. The base metal hardness could be anything close to 28HRC or less. It's reasonably high hardness value. Although PTAW is widely followed for depositing Stellite overlay, it could embrittle Duplex , if the heat input is high. What is the Preheat temperature(if at all) adopted, and the calculated Heat Input. For Zeron 100, Q should be typically 1.0-12.Kj/mm.

In your, case the cracks are visible after depositing 2^nd layer(i.e. Stellite over Stellite), which is an indicator that hard products like Stellite are not able to accommodate the shrinkage stress. In case of Stelllite hardfacing application of buffer layers with Nickel base alloys(Alloy 625) could be of help.

Refer the provided guidance in this literature as a reference.

Thanks.

P.Goswami.P.Eng, IWE.

Independent & Consulting Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@rogers.com,pradip.goswami@gmail.com

Cell/Whasapp:1-905-9793232

From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Srinivasan Jagannathan
Sent: November 20, 2020 11:28 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:31759] Facing crack in during overlay welding of Stellite 12 on Duplex material

Dear Suresh,

Grind the surface just before the deposition and try. This might be due to Chromium oxide which has already formed on the surface. Also slow cool by wrapping the entire job with an asbestos cloth.

Srinivasan

On Fri, Nov 20, 2020 at 9:37 PM SURESH <qms.pjgpl@gmail.com> wrote:

Dear sir
While welding itself I am getting crack.

Ring is holded in the positioner by means of clamps at 90 degree and we are proceeding the welding.

Regards
Suresh
On Friday, 20 November 2020 at 16:47:34 UTC+5:30 JS wrote:
Dear Suresh

Are you getting the crack during the deposition? Or after the job is cooled?

Srinivasan

On Fri, Nov 20, 2020 at 3:16 PM SURESH <qms....@gmail.com> wrote:
Dear Experts
During welding of Duplex grade material we are facing crack on the weld metal as attached in the photo. Below is the detailed process for reference

Process: PTAW
Base Material: ASTM 182 Gr.F55
Consumable: Stellite 12 (Powder)
PreHeat: Nil
Interpass: <200*C
Current: 128 to 145
Gas: Ultra Pure ARGON
Job Size: OD544 X ID 472 X Thk 36mm
Welding: Overlay weld on OD Surface alone

We are welding deposition thickness of 3mm. So as per this we are doing welding of 2 layer with multi pass, On welding second layer we found crack. Can anyone suggest where it is went wrong and why this crack is propagated. Please advice

In First layer- Total of 12 weld pass
In second layer- Total of 12 weld pass

Regards
Suresh
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