Welding and bending 321 stainless steel
Welding and bending 321 stainless steel
(OP)
I need to make a 8" diameter coil out of .20 wall 1/2" diameter 321 tubing .Could you tell me what size and kind of rods to weld with ?I was planing to stuff the tubing with sand,then rape it around a mandrall wile applying heat to it. how do you think it will work?





RE: Welding and bending 321 stainless steel
RE: Welding and bending 321 stainless steel
Do you mean that you would not "heat"?
http://www.welding-advisers.com/
RE: Welding and bending 321 stainless steel
Correct. This material has sufficient ductility for cold bending. The question is what the intended service of the coil.
RE: Welding and bending 321 stainless steel
I was told by mr. Gluhareff(he pasted way in 1994) a long time ago to make the coil you had to aneal the tubbing ,fill it with sand an then rape it around a mandrall.
The engine was built in 1988 and has lasted a long time.
the coils have cracks .I have the 321ss tubing to make two new one ,any advice would be a big help.
RE: Welding and bending 321 stainless steel
Yes, the tubing is cold bent with sand to avoid crimping. The annealing is done beforehand to assure that the material is at its lowest strength for forming.
My recommendation is to have the coil re-annealed after cold bending to assure maximum corrosion resistance and elevated temperature properties.
RE: Welding and bending 321 stainless steel
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Welding and bending 321 stainless steel
If you cold work in excess of 15% strain AND have exposure to service temperatures between 1000-1250 deg F, or exposure to service temperatures above 1250 deg F AND 10% strain we had instituted requirements for a post fabrication anneal. I would follow these requirements if the coil is eposed to service temperatures above 1000 deg F.