Titanium and its alloys wires for additive manufacturing that excels in stability of arc

Titanium and its alloys are functional materials for their great heat and corrosion resistance and lightness, however it is expensive to produce due to poor workability and machinability. For the reasons, the additive manufacturing (AM) technique is expected for the candidate process in mass production. MIG/MAG- WAAM is superior to deposit at high speed, and therefore suitable for manufacturing Large-scale works. Titanium should be deposit by MIG-WAAM inside the Argon enclosure due to property which can react with oxygen easily. However, the arc which MIG welding is unstable by deficiency of the cathode point. Because of development of wire feed control technology, Titanium welding by MIG becomes easier, however a stability of arc is still important since these are relative to shape of AM products. G-coat, which is our development titanium or its alloys wire, has good arc stability because of existing thin oxide film on the surface. The bead which deposit on top of the previous bead sometimes form in a position offset from the center in conventional titanium and its alloys. This is potential cause of the surface irregularities on the surface of AM products. On the other hands, thanks to the arc stability, G-coat can deposit without significant unevenness. Generally, the height of Titanium welding beads by CMT-MIG tend to be high, however G-coat can make low height beads. Therefore, this contributes to lead to the suppression of lack of fusion which is likely to cause problems in CMT-WAAM.