AWS A5.9: ER309LMo is a submerged arc welding wire similar to AWS A5.9: ER309L with the addition of 2.0 - 3.5% molybdenum to increase pitting corrosion resistance. Also used for surfacing of base metals to improve their resistance to corrosion. AWS A5.9: ER309LMo is suitable for joining stainless steels to carbon steels or low-alloy steels such as 316L to mild steel and for overlay welding where higher Mo content is desired in the second and third layers.

AWS A5.9: ER309LMo Submerged arc welding wire 

Chemical Composition (%)

Welding Positions:

Diameter

Smooth finish free from surface defects and foreign matter.

Base Materials

1.6 – 4.0 mm; sizes and tolerances acc. to ISO 544 and AWS A5.9.

Classification:
EN ISO 14343-A: S 23 12 2 L
SFA 5.9 / AWS A5.9: ER309LMo

Wire Electrode Surface

Package Forms

Dissimilar joints between mild steels, low alloy steels, high tensile low alloy steels, ferritic Cr steels, austenitic Cr-Ni steels and manganese steels.
Surfacing/overlay for the first layer.

Suitable fluxes: EN 760: SA AF 2 DC, WP 380

Flux type suitability is strongly dependent on its application. In combination with the wire electrode the most suitable flux should match the requirements of the plate material as closely as possible under the existing welding conditions. Further information can be obtained from the technical flux data sheet

Coils, spools, drums and spiders as standard package forms for SAW-wire electrodes, different package forms on request.