Avesta FCW LDX 2101-PW description: AVESTA FCW LDX 2101-PW is designed for welding the ferritic-austenitic (duplex) stainless steel Outokumpu LDX 2101 and equivalent. LDX 2101 is a ”lean duplex” steel with excellent strength and medium corrosion resistance. The steel is mainly intended for applications such as civil engineering, storage tanks, containers etc.