Avesta FCW 309L-PW description: AVESTA FCW 309L-PW is a high-alloy 23 Cr 13 Ni wire primarily intended for surfacing on low-alloy steels and for dissimilar welds between mild steel and stainless steels. AVESTA FCW 309L-PW is designed for all-round welding and can be used in all positions without changing the parameter settings.