Welding alloy 625 to 316L
Welding alloy 625 to 316L
(OP)
Does anyone has experience to weld alloy fittings to 316L piping. It is a temporary solution to achive mech completion and start-up as alloy piping has a long delivery time. We also will have problems to get DN400 fittings in 316L here in Korea. The alloy fittings are in our stock.
We will operate only at max. 550°C instead of normal 700°C.
Can it bewelded?
What filler has to be used?
Any heat PWHT necessary?
Our plant is in Korea and welders for alloy625 are difficult to find. So it will be a challenge to finish this job within 4 weeks.
Thanks
We will operate only at max. 550°C instead of normal 700°C.
Can it bewelded?
What filler has to be used?
Any heat PWHT necessary?
Our plant is in Korea and welders for alloy625 are difficult to find. So it will be a challenge to finish this job within 4 weeks.
Thanks
RE: Welding alloy 625 to 316L
you can use A 59 alloy a AWS 5.14 AWS ERNiCrMo-13 - (UNS N06059)
https://www.soges-spa.it/en/catalogue/mig-mag-wire...
RE: Welding alloy 625 to 316L
RE: Welding alloy 625 to 316L
RE: Welding alloy 625 to 316L
No PWHT required as these are both austenitic alloys.
Getting a procedure and qualifying it and the welders will take some work.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Welding alloy 625 to 316L
Btw. It would be helpful if anyone could advice a reliable supplier for ally 625 welded or seamless pipes. We will build a new plant in the US too so currently delivery time is long up to 9 months.
RE: Welding alloy 625 to 316L
An 9mo delivery sounds good to me.
What sizes are you after?
And how much?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Welding alloy 625 to 316L
We have a Chinese office and sourced new alloy 625 which will be available from 30-60 days. Next week we will check the stock material and take it immediately after testing.
RE: Welding alloy 625 to 316L
RE: Welding alloy 625 to 316L
RE: Welding alloy 625 to 316L
RE: Welding alloy 625 to 316L
310 would not be as strong or corrosion resistant as 625, but it costs a lot less and handles these temperatures well.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Welding alloy 625 to 316L
yes we use some 310 but their engineering was much too late and pipe stress analysis faced many problems. It will be considered for the next plant.
RE: Welding alloy 625 to 316L
There is an old military saying 'Just because You can, doesn't mean you should'.
Recommendation. Whatever You do to join these metals, there will probably be limited authoritative data for strength, durability, corrosion resistance, etc... I suggest in-house testing of typical welds to develop allowables, processes/inspections and long-term durability in Your operating environment.
Regards, Wil Taylor
o Trust - But Verify!
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation, Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", HBA forum]
o Only fools and charlatans know everything and understand everything." -Anton Chekhov
RE: Welding alloy 625 to 316L
https://www.welderdestiny.com/images/Dissimilar-We...
The 686 would give higher corrosion resistance, but you don't need it.
The 82 is more versatile and can be used for a lot of dissimilar metal welds.
Using 625 filler is the most straightforward option.
The biggest issue will be the higher melting point of the 625.
There are other alloys that would work, but stick with things that have been used.
You have looked into the difference in thermal expansion between these two alloys haven't you?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
RE: Welding alloy 625 to 316L
we are not going to use 625 and 316L as we finally found 625 plates and can get our DN400 pipes finished in 3 weeks. The line is operating at 850°C with exhaust gas from a kiln and we do not want to operate with unknown conditions in the welds. Thanks anyway for all your precious feedback.