ER312
Class: ER312
AWS: A5.9
Conforms to Certification: AWS A5.9 | ASME SFA A5.9
Weld Process Used for Tig: (GTAW)
AWS Chemical Composition Requirements
C = 0.15 max
Cr = 28.0 – 32.0
Ni = 8.0 – 10.5
Mo = 0.75 max
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
ER312 is used to weld cast alloys of similar composition and is used to weld dissimilar metals and weld overlays. This alloy has very high ferrite. When welding similar cast alloys, limit welding to two or three layers only.
| Deposited Chemical COmposition % (Typical) | ||
| C = 0.11 | Mo = 0.15 | P = 0.013 |
| Cr = 29.00 | Mn = 1.60 | S = 0.013 |
| Ni = 9.25 | Si = 0.40 | |
| Mechanical Properties (R.T.) | |
| Yield Strength | 75,000 psi |
| Tensile Strength | 105,000 psi |
| Elongation | 25% |
| Reduction of Area | 30% |
Deposited All Weld Metal Properties
Data is typical for ER312 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.