New UltraCore HD-C Wire from Lincoln Electric Provides High Deposition Rates in All Positions for Shipbuilding and Many Other Applications. UltraCore® HD-C is a mild-steel gas-shielded flux-cored wire produced by Lincoln Electric. It’s an ideal choice for out-of-position welding requirements with 100 percent CO2 in the shipbuilding industry and other fabrication applications. Designed to provide high deposition rates and a flat bead appearance in all positions, UltraCore HD-C delivers premium arc performance and fast-freezing slag with a low fume-generation rate. UltraCore HD-C has a wide operating range and is able to reach deposition rates of up to 10 lbs/hour, even in out-of-position applications.