Comprehensive guide to metal additive manufacturing technologies including DMLS, SLM, EBM, binder jetting, and DED for producing end-use metal parts.
Metal additive manufacturing produces fully dense metal parts directly from digital models, enabling geometries impossible with traditional machining or casting. Applications range from aerospace brackets and medical implants to automotive components and tooling inserts.
Direct Metal Laser Sintering (DMLS) and Selective Laser Melting (SLM) use fiber lasers to fuse metal powder layer by layer. DMLS sinters at temperatures below melting point, while SLM fully melts powder for higher density. Both produce parts with mechanical properties comparable to wrought materials.
EBM uses an electron beam in a vacuum chamber to melt metal powder. It offers faster build rates than laser systems but with slightly lower resolution. EBM is particularly suitable for titanium orthopedic implants and aerospace components.
Binder jetting deposits a liquid binder onto metal powder beds, creating green parts that are subsequently sintered. It offers higher throughput and lower per-part costs than powder bed fusion for high-volume production of small to medium parts.
DED feeds metal wire or powder into a melt pool created by a laser or electron beam. It is used for repair, cladding, and large-format additive manufacturing of near-net-shape parts.
Design considerations include support structures, build orientation, thermal management, and powder removal. Lattice structures, internal channels, and topology optimization exploit the design freedom of metal AM.