For Direct Energy Deposition (DED) with wire as filler material, the material selection is
mostly limited to commercially available welding wires. This limits the achievable material
properties for cladding and Additive Manufacturing purposes. Using a coaxial deposition welding
head, in which two different wires can be fed and controlled individually, the alloy composition
can be adjusted in the common process zone in-situ.
In this study, the two wire materials AISI 316L and ER 70S-6 are used in different mixing ratios
to fabricate single weld seams. The different mixing ratios are achieved by varying the wire feed
rates. The material content in the weld is varied between 0% and 100% in 20% steps. The weld
seams are examined with regard to the distribution of alloying elements, hardness and
microstructure. Homogeneous mixing of the two materials was achieved at all mixing ratios. At a
content of 40% or more of ER 70S-6 in the weld seam, there was a drastic change in the
microstructure and a significant increase in hardness. The microstructure changed from austenitic
to ferritic-pearlitic, which was accompanied by an increase in hardness from 170 HV0.1 to
428 HV0.1.Mechanical Engineerin
