Scribd
Upload
579 views2 pages

Hot Cracking in Incoloy 825

The document discusses parameters that can cause cracks during welding of Alloy 825. It notes that fully austenitic alloys like 825 and 625 are susceptible to solidification cracking during welding. Low heat input below 1600 kilojoules/meter or definitely below 2000 kj/m is recommended. Concave bead shapes should be avoided as they tend to crack, while reinforced convex beads are better. The filler metals ERNiCrMo-3 and ENiCrMo-3 are appropriate, but ERNiMo-3 should be avoided as it contains iron which can react poorly when welding alloy 825 or carbon steel. Keeping the welding area clean and using low amperage can help avoid cracks.

Uploaded by

navas
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
579 views2 pages

Hot Cracking in Incoloy 825

The document discusses parameters that can cause cracks during welding of Alloy 825. It notes that fully austenitic alloys like 825 and 625 are susceptible to solidification cracking during welding. Low heat input below 1600 kilojoules/meter or definitely below 2000 kj/m is recommended. Concave bead shapes should be avoided as they tend to crack, while reinforced convex beads are better. The filler metals ERNiCrMo-3 and ENiCrMo-3 are appropriate, but ERNiMo-3 should be avoided as it contains iron which can react poorly when welding alloy 825 or carbon steel. Keeping the welding area clean and using low amperage can help avoid cracks.

Uploaded by

navas
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 2

What are the parameters causing cracks in welding of Alloy 825

Dear all,
One problem i has faced in welding joint (forged nozzel to shell joint-both material alloy 825)
that cracks are observed in dye penetration test on many nozzels .please suggest me.

Process used -GTAW + SMAW


Filler metal used- ERNiCrMo-3 + ENiCrMo-3
If you give me ur mail Id ,i can send photo for your review

Fully austenitic nickel alloys, such as 825 and even 625, are susceptible to solidification cracking on
welding.
The first question I would ask, is with what sort of metals does your fabricator normally work? If he
welds stainless, such as 316L, he is probably welding too hot with the wrong bead contour. If he
normally welds carbon steel, well, you have a long way ahead of you.

Welding heat input should be low. Preferably below 1600 kilijoule/meter, definitely below 2000 kj/m.
The bead contour is very important. Shallow, concave beads tend to crack down the center. Reinforced,
convex beads are good.
Excellent nickel alloy welding brochures are available in pdf form from www.specialmetalswelding.com
Two of the best books on welding nickel alloys are:

R.J. Castro & J.J. deCadenet, "Welding Metallurgy of Stainless and Heat-Resisting Steels," ISBN 0 521
20431 3, Cambridge University Press 1975.
(this book is out of print. try www.abebooks.com for a used copy)

and

T.G. Gooch "Solidification Cracking of Austenitic Stainless Steel" pp 31-40 Weldability of Materials, ed.
R.A. Patterson and K. W. Mahin, ISBN: 0-87170-401-3 ASM International 1990.

Trevor Gooch knew more than anyone else about welding austenitic nickel alloys.

In my work at Rolled Alloys I got all the questions from customers concerning nickel alloys.

•Hi all, I am interested in this discussion. We are about to build a vessel with some part in alloy 825 such
as pipes, flanges, nozzles. So we have to weld alloy 825 to 825 and alloy 825 to carbon steel.
I found your comments very useful. I have a question:
we prepared WPS' s for both welds above mentioned with filler metal for GTAW and SMAW process
alloy 625 ERNiCrMo-3 and ENiCrMo-3.
Client commented this suggesting filler metal ERNiMo-3. Which kind of alloy is it?

I would add that welds between 825 to 825 are pipes to pipes/flanges thk. about 7 to 12 mm, welds
between 825 to carbon steel are nozzles (825) to shell (C/S) thk. about 40 mm.
Any answer will be welcome, thanks.

Simone....You should run from welding ERNiMo-3 to 825, CS, or almost anything else. This is HASTELLOY
B-3 and introducing ANY iron into B-3 will have poor results. As amunition, read the HASTELLOY B-3
brochure on Haynes website, www.haynesintl.com. The weld will disappear in an oxidizing enviornment.
I believe your client just missed the AWS specification and really means ERNiCrMo-3. All of the welds
you described should be easily welded with this material. Keep the weld area clean, accept lower
penetration, manipulate the wire well, and keep your amperage low

You might also like