27
Aug
Why Is Most Electron Beam Welding Done In A Vacuum. Electron beam welding in vacuum utilizes the kinetic energy of electrons traveling with high velocity in a high vacuum 10 -3 to 10-5 mm Hg. Electron beam welding is performed in a vacuum environment as the presence of gas can cause the beam to scatter. Electron beam welding EBW is a machine controlled process carried out in a vacuum chamber. A focused beam of electrons velocity approaching 05 times the speed of light strike the work piece instantly vaporising the metal and.
EBM is a welding process utilizing heat generated by a beam of high energy electron. Electron beam welding EBW is a machine controlled process carried out in a vacuum chamber. Electron beam welding generally occurs in a vacuum as the presence of gas molecules can scatter the beam. When the electrons strike the surface of the metal they give up the bulk of their energy as heat and this goes to melt the metal. Recent developments in electron. The oxygen from the air reacts with the metal to form oxides.
As a result specialised fixtures and CNC tables are used to move the workpieces inside the welding vacuum chamber.
Non-vacuum electron beam welding employs essentially the same equipment as in-vacuum EBW but the beam is passed through a series of separately pumped pressure stages to allow the beam to be projected into the atmosphere without causing excessive gas leakage into the beam generator. There are three reasons why EBW needs a vacuum. Vacuum pumps fall into two groups. A powerful and highly accurate beam of electrons is fired at the joint causing the material to melt and then re-solidify to create the weld zone. Many metals including iron will oxidize rust or even burn when heated to a high temperature in a normal atmosphere. Welding is essentially performed in a vacuum high-vacuum welding and is characterized by minimal distortion for applications from thick to thin plates and even detailed welding.