ELECTRON BEAM WELDING (EBW)
Electron Beam Welding (EBW) is a fusion welding in which coalescence is produced by heating the work piece due to impingement of the concentrated electron beam of high kinetic energy on the work piece. As the electron beam impinges the workpiece, kinetic energy of the electron beams converts into thermal energy resulting in melting and even evaporation of the work material.
Advantages of EBW
High penetration to width can be obtained, which is difficult with other welding processes.
High welding speed is obtained.
Material of high melting temperature can be welded.
Superior weld quality due to welding in vacuum.
High precision of the welding is obtained.
Distortion is less due to less heat affected zone.
Dissimilar materials can be welded.
Low operating cost.
Cleaning cost is negligible.
Reactive materials like beryllium, titanium etc. can be welded.
Materials of high melting point like columbium, tungsten etc. can be welded.
Inaccessible joints can be made.
Very wide range of sheet thickness can be joined (0.025 mm to 100 mm)
Disadvantages of EBW
Very high equipment cost.
High vacuum is required.
High safety measures are required.
Large jobs are difficult to weld.
Skilled man power is required.
Applications of EBW
Electron beam welding process is mostly used in joining of refractive materials like columbium, tungsten, ceramic etc. which are used in missiles.
In space shuttle applications wherein reactive materials like beryllium, zirconium, titanium etc. are used.
In high precession welding for electronic components, nuclear fuel elements, special alloy jet engine components and pressure vessels for rocket plants.
Dissimilar material can be welded like invar with stainless steel.