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.