Re: [MW:31760] Facing crack in during overlay welding of Stellite 12 on Duplex material

Nickel barrier maybe required for stellite deposit on duplex steel. 

Vanchinath

On Fri, 20 Nov, 2020, 10:09 pm Srinivasan Jagannathan, <jsrisud@gmail.com> wrote:

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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