izvorni znanstveni rad
Additive Manufacturing (AM) is a technique whereby freeform structures are produced by building up material in a layer-by-layer fashion. Most of AM technologies use powder material as feedstock and different heat sources, so different kind of problems can occur. WAAM (Wire and Arc Additive Manufacturing) is a technology which has been investigated in the last 30 years, although the first patent was introduced almost 100 years ago. It became popular and interesting to investigate due to its ability to produce fully dense metal parts and large near- netshape product. One of the potential future WAAM applications could be producing duplex stainless steels. Their excellent corrosion resistance and high mechanical strength make them a favorable choice for oil and gas industrial sectors or off-shore applications. Since they are more difficult to machine than other stainless steels due to their high strength and high work hardening rate, WAAM could overcome some problems which occur in their production. In this paper, chemical composition, hardness and microstructure of duplex stainless steel parts produced using WAAM, are investigated. Different sets of parameters were tested until the most optimal one was chosen, and WAAM product (wall) was made with MIG welding method, using the robotic station.
welding wire, electric arc, duplex stainless steel, hardness, microstructure
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