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[MW:11515] RE: 11446] Welding by Inconel to P11a material

By Materials & Welding
 

 Mr. Thakkar,

Please find some references for welding of P11a steel which would be of help to you in  narrowing down to correct choice. What's the grade being welded SA 353 or SA 553?. The choices for SMAW welding electrodes could be as follows:-

  • E-NiCr-Mo-6- with A.C power source, usually preferred to avoid any shop or field welding problems such as arc blow.
  • E-NiCrMo-3-(Inconel 625 or equivalent) with both A.C and D.C power sources.
  • E-NiCrMo-4-Hastelloy C-276 type electrodes ,with both A.C and D.C power sources, but is sometimes difficult to tackle (hot cracking??)
  • ENiMo-8. The nominal composition  70 Ni, 18 Mo, 7 Fe, 3 W, 2 Cr. Electrodes of this classification are popularly used for welding 9 percent nickel steel such as  ASTM A 333, A 334, A 353, A 522, and A 553. Recommended for A.C.
Note majority of the electrode specifications inSFA 5.11 are formulated for D.C. However for selection of power sources for a specific type of electrode it's always advisable to consult the manufacturer including the guaranteed impact results at  minus -196 deg C for above (as appropriate). If you get the impact test results with both A.C and D.C power sources , then always there would be better guarantee  for impact at such low (cryogenic temperature).
 
9%Ni steel is notorious for residual magnetism, so A.C electrodes are generally preferred also A.C gives  better impact properties under the same welding parameters.
 
Thanks.




Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Maulik H. Thakkar
Sent: Thursday, June 23, 2011 1:07 PM
To: Materials & Welding
Subject: [MW:11446] Welding by Inconel to P11a material

Dear All,

Request you to suggest me the suitable inconel welding electrode
(SMAW) for welding of P11A # P11A base material.

Details: 9% Ni steel, No PWHT, Base Metal Thickness 13 mm. Impact required 27J min @ -183 degree cen.

As per ASME SEC II-C most suitable consumable is ENiCrMo-6. However can I use ENiCrMo-3? If yes why & if no why?

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