Electron beam melting - description of the process
The EBM process (electron beam melting) produces components by fusing layers of metal powder with an electron beam in a high vacuum. A cathode heated to 2,500 °C emits electrons, which are guided by electromagnetic fields and hit the metal powder at half the speed of light. This completely fuses the powder at that point. The vacuum prevents any oxygen from being trapped, which makes the components very strong.