No particular specification but its preferrabler to use basic type coatings for SMAW, basic fluxes for SAW, and no ferrite fillers for FCAW.
Chuck can help us out here even more. You will see some degredation in ease of welding with basics (they won't flow and wet as well), and you will need to control heat input a little better with your no ferrite FCAW's. But those temp regimes are not particularly challenging to SS with careful WPS's.
The Charpies should not prove problematic for you. There is no precipitous ductile to brittle transition with SS's (S curves) like there is with ferritics.
Jimmie,
For cryogenic applications you will be required, by Code, to do impact testing, as Jeff said. The 3 impacts opposite the notch will be required to meet the minimum of 15 mils later expansion. Also, as Jeff said, it is best to use a low ferrite, or no ferrite filler metal. Ferrite affects the ability to meet the later expansion requirements. You can use a low ferrite, below 5FN, to have a very reasonable assurance of passing, but a pure austenitic filler like a 310 will give better results. Virtually any welding process is applicable, but FCAW has shown to have a few problems when doing the impacts due to the oxidation in the flux, but that is seldom. The thing to remember is the lower the ferrite, the better. Send me your e-mail address and I will send you a paper about filler metals for cryogenic applications.
Chuck, I'd be interested in reading that paper as well if you feel like sending it my way?
Regards,
gerald
Gerald, send me an e-mail at chuck.meadows@avestawelding.com and give me your e-mail address and it will be on its way..
in my previous project ,we have done similar job with ER308 and E308L-15. we had no problem. but the thickness was not more than 19mm
furthermore consumable which has 5FN or below, is very hard to find in market . the consumable companies can not guarantee this level.
Regards
nt,
Your expereience is similar to mine. <5FN stuff can be problematic in supply since everyone is concerned in going the other way for crack resistence puproses. You generally have to purchase SS fillers specifically designed for cryo applications or as Chuck said, go to a fully austenitic 310.
But this introduces and interesting thought. All this fretting over ferrite in SS welds, and yet tons of 310 is welded every day. Increasing amounts of non ferrite fillers are welded every day and in very critical applications of extreme low temp where one would expect microfissures to perhaps be most problematic. Perhaps all this concern for ferrite is a little, just a little, overblown.
Given the thickness, it sounds like a job for SAW. However, the proper combination of fluxes and wire for this will be inherently particular on heat input and weld joint geometry.
As far as the proper combination, I'll leave that answer up to Chuck. One other comment though, is this a low temperature application or a cryogenic application? given the impact requirement you have it sounds like cryogenic?
Regards,
Gerald