Welding on Superduplex material by hyperduplex filler wires
pankaj phuse
As precautionary measure we have selected Hyper Duplex 2707 as welding material for the reactor. In principle 2707 HD is considered as a grade higher than 2507 as far as PREN is concerned, owing to which we brought it into the picture.
We wish to know your feedback on the quality of welding attained with this combination and corrosion resistance of weld joints as it goes through heat transition during welding.
pgoswami
Hi Pankaj,
What’s the rationale behind selecting 2707 HD filler for 2507 filler metal, knowing the facts that in almost 100% of the cases, matching 2507 filler would meet or exceed the design requirements of 2507 base metals. What ‘s the reactor involved including the design requirements ? These would be the guiding factors for selecting matching or superior grades of welding consumables.
Your responses would be appreciated.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding &
Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
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pankaj phuse
- Excellent resistance to pitting corrosion
- Excellent resistance to stress corrosion cracking (SCC) in chloride containing environments
- High resistance to general corrosion in acidic environments
- Excellent resistance to erosion corrosion
- Extremely high mechanical strength
pgoswami
Hi Pankaj,
Please see the extract from Sandvik Literature. S -51- 63. 11/ 20 06 on welding recommendations of SAF 2007HD base metal. The matching welding consumable is 27.9.5.L. Should your client insist on this type of welding consumable for welding SAF 2507 then 27.9.5.L would be the choice.
My understanding there’re very few manufacturers of such welding products which are compatible to SAF 2707 HD. It may be proprietary to Sandvik.
An extract from their literature is produced here for general understanding of the welding metallurgy of this alloy. The highlighted are worth noting to meet the required design specifications’ requirements.
Note: the description below is for general understanding, not to promote any one’s product.
Hope it would help to clear your doubts.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/2d39b26c-7604-45f5-a133-6162eaa2c596%40googlegroups.com.