Inconel 182 is not a mill bar-stock alloy - it is a covered welding electrode (AWS A5.11 classification ENiCrFe-3) used for shielded-metal-arc welding of Inconel alloys 600 and 601, and for joining dissimilar metals such as carbon or low-alloy steel to stainless steel or nickel-base alloys. Machinists most commonly encounter this material as deposited weld metal: buildup, cladding, or a dissimilar-metal weld joint that needs to be ground or finish-machined after welding, rather than as bar or plate purchased for turning or milling from solid stock.

The deposited weld metal has a nickel-chromium-iron composition broadly similar to wrought Inconel 600, with an elevated manganese addition specifically included to resist hot cracking and fissuring during solidification of the weld bead - a detail that matters for weld-metallurgy purposes but has limited effect on machinability once the deposit has cooled. Niobium is also present as a carbide-forming/stabilizing element, similar to its role in Inconel 82 filler wire.

Because it is a weld deposit rather than a mill-annealed wrought product, the as-deposited microstructure is dendritic and can carry more local hardness variation than wrought bar of a similar nominal composition - something to keep in mind when finish-machining weld buildup or overlay passes.

Finishing Inconel 182 weld deposits - grinding, facing, or boring a weld overlay or dissimilar-metal joint - carries the same fundamental difficulties as machining wrought nickel-chromium-iron alloys, with the added complication of an as-welded dendritic structure that is rarely perfectly uniform. Low thermal conductivity concentrates cutting heat at the tool edge rather than letting it dissipate into the chip, and the material work-hardens readily under mechanical and thermal stress from the cut, so any hesitation, rubbing, or dull edge quickly burnishes a hard skin into the surface.

Because weld deposits can carry pockets of local hardness variation, inclusions, or minor porosity that a mill-annealed bar would not have, tool paths that assume a perfectly homogeneous, defect-free workpiece can run into unexpected chatter or edge chipping. A conservative, rigid approach - sharp positive-rake carbide, moderate-to-low cutting speeds, and light, consistent depths of cut - is the safest starting point until the specific weld deposit's behavior is understood.

As with wrought Inconel 600/601, the alloy retains strength and hardness at elevated temperature rather than softening the way steel does, so tool edges remain under load even as cutting temperatures rise. Rigid setups and generous, consistent coolant delivery remain standard practice for any finish-machining or grinding operation on this weld metal.