Class: ER409NB

AWS: A5.9

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

Weld Process Used for Tig (GTAW)

AWS Chemical Composition Requirements
C = 0.08 max
Cr = 10.5 – 13.5
Ni = 0.60 max
Mo = 0.50 max
Mn = 0.80 max
Si = 1.00 max
P = 0.04 max
S = 0.03 max
Cu = 0.75 max
Nb = 10 x C (min) – 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
ER409Nb is a ferritic stainless steel welding wire which is used to weld Type 409 and 409Ti base materials. Addition of columbium leads to a preferential reaction with carbon, saving chromium from forming carbides. This improves corrosion resistance, increases strength at high temperatures.

Deposited Chemical Composition % (Typical)
C = 0.05	Mo = 0.30	P = 0.016
Cr = 11.5	Mn = 0.62	S = 0.018
Ni = 0.35	Si = 0.48	Cu = 0.16
Nb = 0.50

 

Mechanical Properties (R.T.)
Yield Strength	50,500psi
Tensile Strength	67,000psi
Elongation	26%

Deposited All Weld Metal Properties
Data is typical for ER409Nb 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.