Pradip Goswami,P.Eng
88,Garth Trails Crescent
Hamilton,Ontario, L9B2X1,Canada
Tel-905-679-9677
From: GOSWAMI Pradip -FOSSIL [mailto:pradip.goswami@opg.com]
Sent: Monday, January 04, 2010 2:03 PM
To: pgoswami@sympatico.ca
Cc: pgoswami@quickclic.net
Subject: MW:3946-Overlay/cladding procedure
Hi Mr Tong Tong,
If you refer API-582, Appendix-B ,Table-B1, it recommends the following weld overlay techniques, with Carbon and Low Alloy Steel Backing Materials.-
| | Weld Overlay Materials | |||||
| Clad Material | Equipment Requiring PWHT | Equipment Not Requiring PWHT | ||||
| | Barrier/First Layer | Subsequent Layer(s) | Barrier/First Layer | Subsequent Layer(s) | ||
| 405 / 410S | · ENiCrFe-2 or -3 or · ERNiCr-3 or · E/ER309/309L | · ENiCrFe-2 or -3 or · ERNiCr-3 or · E/ER309/309L | ||||
| 321 / 347 SS | · E/ER309L/ · E309Cb(Nb) | · E / ER347 | · E/ER309L/ · E309Cb(Nb) | · E / ER347 | ||
| | | | | | | |
While depositing on 405/410 S.S clad, you have the options of choosing both Inconel Type consumable (E-Ni Cr-Fe-3 or E-Ni-Cr-3) or conventional austenitic S.S consumables (309/309L) for all layers.
- Inconel type consumables are preferred for welding on coke drums type environments, to avoid quench cracks due to frequent thermal cycling.
- 309/309L welding consumables should not be used for design temperatures exceeding 6000F(3150C).
For weld overlay on 321/347 Clad the above recommended technique is the best option. The barrier/first layer shall be deposited either with 309L or 309Cb type welding consumables followed by 347 type for final layer. Acceptable welding processes are listed in clause 5.1, API 582.
As regarding the weld procedures of your contracting company:-
1. Clad restoration procedure with all SS 309L for 410SS cladding is acceptable if the design temperature is below 6000F(3150C).
2. In the design temperature vs environment (sulphur and non-sulfur) falls within the range Table-3 (look under clause 6.2.2), the Nickel based welding consumables, e.g. E-NiCrFe-3 or E-NiCr-3 shall be used. The vendor has to qualify a new procedure.
3. All 309L consumables are not allowed for clad restoration of S.S 347. The final layers have to have the chemistry of 347 S.S weld metal . Hence the vendor has to qualify a new procedure with 309L/309Cb (first layer) followed by 347S.S weld metal(final layers).
All welding procedure shall meet the requirements of ASME Sec-IX. Essential variables shall be as per QW-254.1(for SMAW), QW-255.1(GMAW), 256.1 (GTAW). Procedure Qualification Thickness Limits and test requirements should be as per QW-453. Chemical analysis and hardness test requirements shall be as per QW-462.5(a).
In addition all the applicable requirements of AP1-582, Appendix-B shall be met
I hope the above guidelines would help you. Feel free to ask if you have further queries on any overlay welding issue.
Thanks.
Pradip Goswami,P.Eng
Senior Engineer/Specialist(Welding-Metallurgy)
Machine Dynamics & Component Integrity Dept.
Engineering & Training Services Division
ONTARIO POWER GENERATION Inc.
PO Box-2000, RR-55(South)
Nanticoke, Ontario,N0A1L0
Tel:-(519) 587-2201, Ext 3107--in Nanticoke
(416) 231-4111, Ext 5925--in Kipling,Toronto
Fax: (519) 587-6814
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of tong tong
Sent: Sunday, January 03, 2010 7:27 AM
To: materials-welding@googlegroups.com
Subject: [Norton AntiSpam] [MW:3946] Overlay/cladding procedure
Hi ,
I have one query regarding above mentioned subject. Let me brief in general what actually happen in my project. My project is modification of clad column (installation of new nozzles) and associated piping. Existing cladding is SS 410S (Middle to bottom section) and SS 347 (top section). After referring to API 582 Appendix B table B-1, recommendation of filler selection for
1. SS 410S is ER NiCr-3 for 1st and 2nd layer
2. SS 347 is ER 309Cb for 1st layer and ER 347 for 2nd layer.
I already instructed our contractor to qualified cladding procedure (GTAW process) based on ASME IX and API 582 but unfortunately our contractor refused to do it and claim their existing Cladding procedure SS 309L qualify to clad SS 410S and SS 347.
I don't know what to do now because I'm not well known about ASME IX. Please help and advice me. You cooperation is highly appreciated
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