Vacuum Electron Beam Welding
Vacuum electron beam welding is a fusion welding process in a high vacuum that uses high-energy electron beams to melt the materials. It enables deep, narrow welds with minimal thermal distortion.
Physicochemical mechanism of action
The high-energy electron beams dissociate the atoms of the materials being welded and join them into a new crystal lattice. This happens in a high vacuum to prevent pore formation.
Metallurgical relevance & risks when welding
The high energy of the electron beams can cause rapid cooling and lead to a fine grain structure in the microstructure. This increases toughness and hardness, which is advantageous for certain applications. However, insufficient vacuum can lead to pore formation, which compromises the strength of the weld.
Workshop practice & action instructions
• Operate the device in a clean, fully sealed high vacuum.
• Ensure that the electron beam voltage and duration are correctly set (typically 10 kV to 20 kV and 5 s to 30 s).
• Use appropriate protective clothing and respiratory protection, as the device is high-energy.
• Constantly monitor temperature and pressure in the high vacuum.