Re: [MW:11635] CLAD MATERIALS - WELD -PWHT

Hi Sundaram,

 

Trust me, this can't be explained in single mail as you are not very specific with your question.

 

I assume procedure has to be qualified with ASME sec ix as Cladding has to be carried out for API pipes.

Process:- Try Pulse GMAW, can change deposition rates significantly

 

Refer AWS A5.14 for electrode

 

To qualify a procedure for corrosion resistant weld overlay, the welder must deposit a minimum 1.5" wide X 6" long pad of weld overlay on a test coupon using the guidelines/notes in QW-453. For performance testing, the welder must deposit a minimum 1/2" wide weld overlay consisting of a minimum of 3 weld beads in the first layer. This is done to achieve the necessary dilution with the base metal. There is no limit on the maximum number of layers for the weld overlay.

Base material, Consumable (AWS classification) and position should be within the allowable limits since these are essential variables, no limit on max thk of overlay deposit. 

PWHT is not applicable if you overlaying on the pipe but if you are butt welding 2 claddel pipes with inconel, it might be applicable to PWHT considering range of thickness per Sec Viii div 1 UCS-56 (i guess you are not going with 2nd option)

 

All tests per ASME Sec ix and Client spec:-

 

Dimensional Verification, visual inspection, Dye penetrant testing per Sec viii  div 1- App 8, dilution on weld surface shall not exceed 10% of base metal, root bead chemical analysis to match Inconel composition, transverse weld hardness survey (max 35 HRC), corrosion test (sour service), micrographic (*400)- microstructure of the HAZ should be free of precipitations and intermetallic phases, Side bends

 

For volumetric examination of CRA production groove welds, radiography (RT) is generally the best choice. Ultrasonic examination (UT) of CRA production groove welds is generally ineffective because of the nature of CRA weld metal 

 

Heat affected thickness to be minimized by lower heat input and higher travel speed.

 

Account all the suggestions and let us know ur case specifically.

 

 

Regards

Manpreet Singh

From: "Sundaram Elumalai"Elumalai.Sundaram@starfab.com.sa
Sent: Thu, 07 Jul 2011 18:25:41 +0530
To: materials-welding@googlegroups.com
Subject: [MW:11607] CLAD MATERIALS - WELD -PWHT

Hi Experts,

If anyone is having experience with the following CLAD materials, please give your input during the PQR / production weld. Is the PWHT will impact the corrosion property of Clad.

Pipe	NPS:10-Thk:45mm-PIPE-API 5L GR.X65 PSL2 - SMLS -GA-E-61036	BW	3mm Inconel Cladded
Pipe	NPS:12-Thk:15.88mm-PIPE-API 5L GR.X65 PSL2 - SMLS -GA-E-61036	BW	3mm Inconel Cladded
Pipe	NPS:12-Thk:45.5mm-PIPE-API 5L GR.X65 PSL2 - SMLS -GA-E-61036	BW	3mm Inconel Cladded
Pipe	NPS:12-Thk:53.5mm-PIPE-API 5L GR.X65 PSL2 - SMLS -GA-E-61036	BW	3mm Inconel Cladded

With Kind Regards,

S.Elumalai.

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