GTAW · Stainless steel
ER2209
The matching filler for 22 chromium duplex stainless, deliberately over-alloyed in nickel so the deposit does not solidify with too much ferrite.
What the designation means
Point at any character to see what it claims. The classification is a sentence written in fields, not a product name.
- ERClassified as both an electrode and a hand fed filler rod.
- 22Nominally 22 percent chromium, the level that gives duplex stainless its corrosion resistance.
- 09Nominally 9 percent nickel, deliberately higher than the base metal so the weld holds enough austenite after fast cooling.
At a glance
- Process
- GTAW
- Family
- Stainless steel
- Positions
- All positions
- Polarity
- DCEN
- Shielding
- Welding grade argon at the torch, with argon or an argon-nitrogen blend as backing to protect the root and hold the phase balance
- Minimum tensile
- 100ksi
Typical uses
- Duplex stainless piping and vessels in offshore oil and gas
- Seawater and desalination process equipment
- Chemical plant handling chloride bearing fluids
How it runs
- High strength deposit, well above the standard austenitic stainless fillers
- Heat input and interpass temperature must be held within a window to keep the ferrite and austenite balanced
- Nitrogen in the backing gas helps preserve austenite at the root
- Puddle is sluggish and the bead is duller and more magnetic than an austenitic deposit
Storage and handling
Store in the sealed tube in a clean dry area and keep the rods free of carbon steel dust that would contaminate the deposit.
Compare with
SMAWE2209-16A duplex stainless rod that deposits a roughly half austenite, half ferrite structure, combining high strength with strong resistance to chloride stress corrosion cracking.GMAWER316LThe molybdenum-bearing stainless filler used wherever chlorides or process acids would pit an ordinary 18-8 deposit, matched to the 316 and 316L base metals.GTAWERNiCr-3A nickel-chromium rod used for nickel alloy base metals, dissimilar joints, and overlay, where its niobium addition resists cracking through heavy dilution.