SMAW · Stainless steel
E2209-16
A duplex stainless rod that deposits a roughly half austenite, half ferrite structure, combining high strength with strong resistance to chloride stress corrosion cracking.
What the designation means
- E
- Covered electrode for shielded metal arc welding.
- 2209
- A duplex deposit at roughly 22 percent chromium and 9 percent nickel with molybdenum and nitrogen, aimed at a balanced austenite and ferrite structure.
- -16
- Titania bearing covering, usable on alternating current or direct current electrode positive.
At a glance
| Process | SMAW |
|---|---|
| Family | Stainless steel |
| Positions | All positions |
| Polarity | DCEP, or AC |
| Shielding | Self-shielded by the covering |
| Minimum tensile strength | 100 ksi |
Typical uses
- Duplex stainless piping and vessels in offshore and chemical service
- Seawater handling equipment and desalination plant
- Storage tanks handling chloride bearing process fluids
How it runs
- Much higher strength deposit than the standard austenitic stainless rods
- Heat input and interpass temperature must be controlled to hold the phase balance
- Sluggish puddle with dense slag that needs full interpass cleaning
- Bead face is duller than an austenitic deposit and slightly more magnetic
Storage and handling
Store sealed and dry in a warm cabinet, and keep atmospheric exposure short so the covering does not pick up moisture.
Compare with
GTAWER2209The matching filler for 22 chromium duplex stainless, deliberately over-alloyed in nickel so the deposit does not solidify with too much ferrite.SMAWE316L-16The molybdenum-bearing stainless rod chosen when the service environment contains chlorides or acids that would pit an ordinary 18-8 deposit.SMAWE309L-16The go-to rod for joining stainless to carbon steel, because its extra chromium and nickel keep the diluted deposit austenitic instead of hard and crack prone.