Bhabha Atomic Research Centre (BARC) is offering technology for the manufacture of ‘electron beam welding’ (EBW) machine, which is used in hi-tech welding applications, as well as to weld high strength materials such as Niobium, Zircalloy and maraging steel.
BARC is asking for a one-time fee of Rs 6.30 lakh.
The 12kW, 80kV EBW can weld both circular seams (280 mm maximum) and linear seams (200 mm max), with low mechanical distortion. This reduces the post-welding machining costs. This is particularly useful where the purity of the weld is of utmost importance, since the weld process is carried out in vacuum.
is of utmost importance since the weld process is carried out under vacuum.
EBW is mainly used for welding of nuclear and aerospace components. Advancements in the EBW process automation has led to increased production throughput. Hence this welding process is at present receiving wider application in automotive and microelectronics industries.
Due to the high-power density of the beam spot, this welding process can produce deep penetration welds with very low mechanical distortion. Hence EBW can be the last step in the manufacturing sequence. This reduces the post weld machining cost. EBW is also useful in welding thick sections in a single pass. In applications wherein the purity of the weld is of utmost importance, EBW has found favor as the weld process in carried out under vacuum.
EBW is mainly used for welding of nuclear and aerospace components. Advancements in the EBW process automation has led to increased production throughput. Hence this welding process is presently receiving wider application in automotive and microelectronics industries.
The EBW is defined as a fusion welding process wherein coalescence is produced by the heat obtained from the concentrated beam composed of high velocity electrons. The kinetic energy of the electrons changes to thermal energy thereby melting and fusing the work piece metal. Welding is often done in a vacuum environment to prevent dispersion of the electron beam.
The EB is formed inside the EB gun chamber which consists of a filament, grid electrode and the anode. The electrons are generated by heating the filament and are accelerated by applying a high voltage between the filament and the anode. The grid electrode controls the number of electrons that constitute the beam. The EB emerges from the gun through an aperture in the anode. It is then focused by electromagnetic lenses onto the weld joint. The work handling system maneuvers the job under the beam in a desired manner to complete the weld.
For further details, contact:
Head, Technology Transfer and Collaboration Division
Bhabha Atomic Research Centre,
Trombay, Mumbai 400 085.