Welding A350-LF3 with 309 consumables
Welding A350-LF3 with 309 consumables
(OP)
I need to weld A350-LF3 with a restriction of no FCAW. I am having a problem in finding consumables - EN-Ni3.
Does anyone see any reason why I could not qualify a PQR using 309 consumables? I already have a PQR qualified for welding LF3 to P8.
Any help would be appreciated.
Does anyone see any reason why I could not qualify a PQR using 309 consumables? I already have a PQR qualified for welding LF3 to P8.
Any help would be appreciated.





RE: Welding A350-LF3 with 309 consumables
RE: Welding A350-LF3 with 309 consumables
The procedure is for welding LF3 to itself, however I am finding problems procuring EN-Ni3 consumables. If you have any alternate suggestions it would be greatly appreciated.
I am hoping to use GTAW - Root, SMAW or GMAW fill and SAW fill and cap.
Thanks
RE: Welding A350-LF3 with 309 consumables
If I understood your question you have a FCAW qualified welding process using EN-Ni3.
So you cannot use it for SMAW or TIG using E309 and ER309
Luis Marques
RE: Welding A350-LF3 with 309 consumables
RE: Welding A350-LF3 with 309 consumables
On a side note, do you know of any mechanical or metalurgical reason to stay away from the 309 scenario?
RE: Welding A350-LF3 with 309 consumables
No, not really. But why complicate your situation and avoid using typical low alloy filler metals for this? Keep in mind that inspection of the completed weld joint with 309 will require Liquid Penetrant versus magnetic particle, this has to be evaluated.
RE: Welding A350-LF3 with 309 consumables
The highly dissimilar expansion rates of the 309 vs the 350-LF3 can place undue shear loads at the fusion line of the weld. Cyclic service life will be adversely affected depending on actual service conditions. A better choice would be to use a Nickel base alloy weld filler metal if matching filler metals are not available.
RE: Welding A350-LF3 with 309 consumables
RE: Welding A350-LF3 with 309 consumables
I am amazed at how difficult it is to find these consumables. I am originally from the UK and I would have no problems over there. Not sure why it is so difficult here.
RE: Welding A350-LF3 with 309 consumables
The problem exists because so few vessels/piping are made from 3 1/2% Ni alloy steels. Manufacturers will not manufacture or stock large quantities when demand is negligible. We have recently made some weld repairs to 3 1/2% Ni alloy steel vessels, qualified welding procedures with GTAW and SMAW processes and had no major difficulty in obtaining them. For hard to find welding fillers, I first check with Bohler Welding and Midalloy.
RE: Welding A350-LF3 with 309 consumables
I tried Midalloy.......no luck! I will try bohler though.
Thanks
RE: Welding A350-LF3 with 309 consumables