Hi Srinivasan,
9% Nickel steel is susceptible to magnetization. Use of magnets in handling after heat treatment generally should be avoided since residual magnetism would be detrimental to subsequent fabrication and welding as well as in service. The attached ESAB article gives some tips on ways to avoid arc blow.
Usually connecting the power cable leads closer to the weld is a solution.This may not be possible always in field and shop welding conditions hence the use of AC electrodes are often recommended by consumable manufacturers.
AWS SFA-5.11 categorizes a few types of welding electrodes for welding 9% Nickel steel as follows, duly supported by welding consumable industry:-
- ENiCrMo-3. Electrodes metal of this classification is used for welding nickel-chromium-molybdenum alloy (ASTM B 443, B 444, and B 446 having UNS numberN06625) to itself, to steel, to other nickel-base alloys, for cladding steel with nickel-chromium molybdenum weld metal, and for welding the clad side of joints in steel with nickel-chromium-molybdenum alloy using theGTAW, GMAW, SAW, and PAW process.
- ENiCrMo-4. Electrodes of this classification are used for welding low carbon nickel-chromium-molybdenum alloy, for welding the clad side of joints in steel clad with low-carbon nickel-chromium-molybdenum alloy, and for welding low carbon nickel-chromium-molybdenum alloy to steel and to other nickel-base alloys. Typical specifications for the nickel-chromium-molybdenum base metals are ASTMB 574, B 575, B 619, B 622, and B 626, all of which haveUNS Number N10276. These electrodes normally are used only in the flat position. This filler metal is recommended for applications where the operating temperature ranges from cryogenic to 1000°F.
- ENiCrMo-6. Electrodes of this classification are used for welding 9 percent nickel steel, but they can be used in other applications as well. Typical specifications for the 9 percent nickel steel base metal are ASTM A 333, A 334,A 353, A 522, and A 553, all of which have UNS NumberK81340. Electrodes through the 1⁄8 in. [3.2 mm] size can be used for welding in all positions. Electrodes larger than that are used only in the flat and horizontal positions
Attached are some catalogues on all three types of above consumables. Generally ENiCrMo-6 consumables are designed to operate with both D.C and A.C . You need to check with the manufacturers with the guaranteed impact values with both polarity. Plus the PQR has to be prequalified as per QW 409.4.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Roy Liu
Sent: Tuesday, June 19, 2012 7:52 AM
To: materials-welding@googlegroups.com
Subject: [MW:14597] Re: 14593] Re: ENiCrMo6 - AC operating
Fortunately, FOX NIBAS 60/15 electrode is also made by Bohler, as well as UTP.
1, this SMAW will meet all mechnical propertites you mentioned;
2, this SMAW is designed only for PA(1G)/PF(3Gu) positions;
3, the high recovery dose not mean that the SMAW takes a heavy coating. I can not explain it. Sorry.
4, Bohler Welding Group includes 6 brands, Boehler, T-PUT (Old Thyssen), UTP, AVESTA, SOUDOKAY, FONTARGEN. Boehler, T-PUT and UTP have the same products although their names are different! So, UTP Soudonel D, Thermanit 13/65 TTW-150, Boehler FOX NIBAS 60/15 are equivalent. You may choose any one of them.
Roy
Bohler Welding Group
From: Baba Kalyani
Sent: Tuesday, June 19, 2012 5:46 PM
Subject: Re: [MW:14593] Re: ENiCrMo6 - AC operating
Dear Advisers,
Apropos to a mail inquiry on SMAW welding consumable requirement for 9% Ni Steel welding, and a reply from a manufacturing company adviser offering their product Fox Nibas 60/15 . Will this consumable deliver over 70J of Impact at Minus 196*C, with a Lateral Expansion of over 1.0mm, and also meet the other AWS requirements, of over 650 MPa of UTS and 25% Elongation. The all-weld assembly will be prepared using only AC current of 150 Amps for 4.00mm, with an Inter-pass temp. of 150*C, to avoid arc-blow effect during welding of cold-tough Nickel steel.
The manufacturer's leaflet also mentions 170% recovery. Does that mean it is heavy coated, synthetic electrode with the inner wire made of something besides ER-NiCrMo-6. Can this SMAW electrode be used for welding in all positions, especially over-head and vertical up. Our application involves welding with very long welding cables.
Also confirm if the above product is equivalent to Thermanit 13/65 TTW 150 or UTP Soudonel D. Please advise.
Gratitude in advance, Baba Kalyani.
On Sun, Jun 17, 2012 at 9:43 PM, Roy Liu <standardliu@hotmail.com> wrote:
--yes, we can.UTP Soudonel DPlease contact us asap.RoyBoehler Welding Group-ChinaFrom: Baba KalyaniSent: Sunday, June 17, 2012 7:25 PMSubject: [MW:14577] Re: ENiCrMo6 - AC operating
On Wednesday, May 16, 2012 4:58:31 PM UTC+5:30, JS wrote:Dear Experts,--We have a job to be welded with ENiCrMo6 which operates on DC.We need to weld with AC current due to Arc Blow / Magnetism.Is it possible to have SMAW electrode of same specification, operating on AC without compromising Mechanical Properties?Please advice.Regards,Srinivasan
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