In Direct Metal Laser Sintering, what is the energy source used to sinter the powder?

• A. A Laser
• B. An Electron Beam
• C. A Plasma Torch
• D. A Microwave

Answer: (A)

Direct Metal Laser Sintering fuses metal powder with a focused laser beam. The laser delivers energy precisely where the part is being built, melting or fusing the powder layer by layer as the build platform lowers and a new layer of powder is spread. This high-energy, tightly focused source allows for fine details and complex geometries, and it can be controlled very precisely to achieve consistent bonding between particles.

Using an electron beam would require a vacuum chamber and is characteristic of electron-beam melting rather than DMLS, so it’s not the energy source here. A plasma torch or microwave energy lack the necessary precision and control for selective, layer-by-layer metal fusion, so they aren’t used in this process.