Welding Rods For Precision Hose & Expansion Joints


Description: 309L is of similar composition as 309 except for the carbon content being lower than .03%. This lower carbon content reduces the possibility of intergranular carbide precipitation. This increases the resistance of intergranular corrosion without the use of stabilizers such as columbium (niobium) or titanium. Strength of this low-carbon alloy; however, may not be as great at elevated temperatures as that of the columbium (niobium)-stabilized alloys or 309.

Application: 309L is preferred over 309 for cladding over carbon or low alloy steels, as well as for dissimilar joints that undergo heat treatment.

Specifications: Conforms to AWS A5.9 Classification: ER309L

Tig Welding Rod
Alloy Size
ER309L 1/16″ (0.063″)
ER309L 3/32″ (0.094″)
ER309L 1/8″ (0.125″)
ER309L 5/32″ (0.156″)


Weld Metal – Chemistry
C (max) Cr Ni Mo (max) Mn Si P (max) S (max) Cu (max)
Typical % 0.03 23.0-25.0 12.0-14.0 0.75 1.0-2.5 .30-.65 0.03 0.03 0.75


Weld Metal – Mechanical Properties
Tensile Strength Yield Strength Elongation
Typical 86.5 ksi 58 ksi 36%