Class: ER309

AWS: A5.9

Conforms to Certification: AWS A5.9              ASME SFA A5.9

Weld Process Used for Tig (GTAW)

AWS Chemical Composition Requirements
C = 0.12 max
Cr = 23.0 – 25.0
Ni = 12.0 – 14.0
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
ER309 is used for the welding of similar alloys in wrought or cast form. It is mostly used for welding dissimilar materials such as mild steel to stainless steel, as well as for a barrier layer in stainless overlays. For some applications, welding of straight chromium steels can be accomplished with this consumable.

Deposited Chemical Composition % (Typical)
C = 0.06	Mo = 0.25	P = 0.018
Cr = 23.50	Mn = 1.80	S = 0.015
Ni = 13.0	Si = 0.40	Cu = 0.20

 

Mechanical Properties (R.T.)
Yield Strength	57,000 psi
Tensile Strength	86,000 psi
Elongation	47%
Reduction of Area	68%

Deposited All Weld Metal Properties
Data is typical for ER309 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.