ER309LMo
Class: ER309LMo
AWS: A5.9
Conforms to Certification: AWS A5.9 | ASME SFA A5.9
Weld Process Used for Tig: (GTAW)
AWS Chemical Composition Requirements
C = 0.03 max
Cr = 23.0 – 25.0
Ni = 12.0 – 14.0
Mo = 2.0 – 3.0
Mn = 1.0 – 2.5
Si = 0.30 – 0.65
P = 0.03 max
S = 0.03 max
Cu = 0.75 max
Available Sizes
.030 x 36
.035 x 36
.045 x 36
1/16 x 36
3/32 x 36
1/8 x 36
3/16 x 36
5/32 x 36
Application
This classification has a low carbon content of 0.03% max. ER309LMO is usually needed for the first layer to achieve low carbon contents in other layers with ER316L or ER317L.
| Deposited Chemical Composition % (Typical) | ||
| C = 0.02 | Mo = 2.40 | P = 0.012 |
| Cr = 23.75 | Mn = 1.75 | S = 0.010 |
| Ni = 13.10 | Si = 0.40 | |
| Mechanical Properties (R.T.) | |
| Yield Strength | 58,000 psi |
| Tensile Strength | 85,000 psi |
| Elongation | 36% |
| Reduction of Area | 55% |
Deposited All Weld Metal Properties
Data is typical for ER309LMo weld metal deposited by Tig using 100% Argon as the shielding gas.
Recommended Welding Parameters |
|||
| GTAW “Tig Process” | |||
| Wire Diameter | Amps DCSP | Volts | Shielding Gas |
| .035 | 60-90 | 12-15 | Argon 100% |
| .045 | 80-110 | 13-16 | Argon 100% |
| 1/16 | 90-130 | 14-16 | Argon 100% |
| 3/32 | 120-175 | 15-20 | Argon 100% |
Note: Parameters for tig welding are dependent upon plate thickness and welding position.
Other shielding Gases may be used for Tig welding. Shielding gases are chosen taking Quality, Cost, and Operability into consideration.