When should I use ER308L, ER309L, ER316L or ER347 filler metal?

ER308L (including ER308LSi) is predominately used on austenitic stainless steels, such as types 301, 302, 304, 305 and cast alloys CF-8 and CF-3. For high temperature applications such as in the electrical power industry, the high carbon 308H electrode provides better creep resistance than does 308L.

ER316L (including ER316LSi) filler metal should be used with ER316L and ER316 base metals. CF-8M and CF-3M are the cast equivalents of 316 and 316L, respectively.

Use ER309L (including ER309LSi) when joining mild steel or low alloy steel to stainless steels, for joining dissimilar stainless steels such as 409 to itself or to ER304L stainless, as well as for joining 309 base metal. CG-12 is the cast equivalent of 309. Some ER308L applications may be substituted with ER309L filler metal, but ER316L or ER316 applications generally require molybdenum and 309L contains no molybdenum.

Type ER347 stainless steel filler metal is ideal for ER347 and ER321 base materials because it matches these stabilized grades. CF-8C is the cast equivalent of ER347. Type ER347 filler metal is also suitable most ER308L filler metal applications.

ER308L – Stainless Steel TIG Welding Rods

ER308L – Stainless Steel TIG Welding Rods

Class: ER308L    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 = 19.5 – 22.0
Ni = 9.0 – 11.0
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

ER308L has the same analysis as type 308 except the carbon content has been held to a maximum of .03% to reduce the possibility of intergranular carbide precipitation. ER308L is ideal for welding Types 304L, 321, and 347 stainless steels. This is a suitable wire for applications at cryogenic temperatures.


Deposited Chemical Composition % (Typical)
C = 0.02 Si = 0.32 Mn = 1.70
P = 0.011 S = 0.009 Cr = 20.0
Ni = 10


Mechanical Properties (R.T.) 
Yield Strength 57,000 psi
Tensile Strength 87,000 psi
Elongation 34%
Reduction of Area 56%

Deposited All Weld Metal Properties
Data is typical for ER308L 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.