SS tank
SS tank
(OP)
I am currently looking at a hydraulic upgrade for a local industry, part of which involves construction of a new tank. The tank is to be constructed from 304 SS. Even though it is more time cosuming I would like to weld both outside and the inside of the tank. How much will the MIG welding process reduce the corrosion resistance on the inside?
Thanks,
Maytag
Thanks,
Maytag





RE: SS tank
RE: SS tank
Higher end systems generally will have SS to avoid the rust and corrosion issue. Welding both inside and outside insures that we are not plagued with a pinhole leak.
Thanks,
Maytag
RE: SS tank
What is the thickness of the SS?
This information may help determine the welding process. Most SS tanks will have full penetration welds to prevent crevice corrosion.
RE: SS tank
1 1/2 psig at the bottom. Material is 304 SS plate, 3/8 inch thick. On other assemblies I have used the MIG process,
using Shield Bright wire( has flux in it) and also shielding with CO2 gas.
Maytag
RE: SS tank
RE: SS tank
I think you need to change the shielding gas. The gas mixture changes with the metal trasfer type:spray-arc, short-circuiting, or pulsed-arc transfer.
Usually mixture of Ar + 2%O2 or 90% He, 7-1/2% A, 2-1/2% CO2 are used 'casue the CO2% can have an effect on Corrosion properties: "keeping the CO2 level low enough so that it does not influence the corrosion resistance of the metal." (ref h
As someone else said the problem is the corrosion roterties of the metal in contact with the fluid. Are u sure that no chloride are contained in the mineral oil?
Welding Stainless Steel
S.
Corrosion Prevention & Corrosion Control
RE: SS tank
thanks for your reply. The Shieldbright is an Esab wire I believe and Esab recommends either an Ar.75 %-25 % C02 mix or 100% C02. I have had good luck following their recommendations in the past but this was not tank fabrication. I could not tell you for sure about the chloride-the 304 SS is common for hydraulic tanks in the industry I serve.
Maytag