Electron Beam Welding Process Parameters

The welding parameters selected in this experiment using the accelerating voltage of 55 kv welding speed of 6 7 mm s and the beam current ranged from 12 ma to 28 ma.

Electron beam welding process parameters.

This allows for a very high volumetric power density which can reach values of the order 10 5 10 7 w mm 3. Shallow penetration depths in the order of hundredths of a millimeter. The vacuum level makes a difference in the quality of the weld. The welded assembly exhibited a minimum amount of distortion but a better understanding of the effects of several key welding parameters on the structural integrity of the weld was required.

Values of power density in the crossover focus of the beam can be as high as 10 4 10 6 w mm 2. The voltage ranges from 70 150 kv for high voltage equipment and 5 30 kv for small voltage equipment. This article throws light upon the four main process variables in electron beam welding ebw. Electron beam welding must occur in a vacuum because air molecules interfere with the propagation of the electron beam.

Download high res image 187kb. The current level ranges from 50 to100 ma. The power supply used in the electron beam welding process is dc power supply sources. Short cycle times a high level of automation and a low rejection rate are key parameters in the automotive industry.

One of the parameters provided by the eb process is the capability to change dynamic movement of the molten material by influencing the size of the key hole. Electron beam eb welding is a fusion welding process whereby electrons are generated by an electron gun and accelerated to high speeds using electrical fields. The beam of electrons creates kinetic heat as it impacts with the workpieces causing them to melt and bond together. Unlike the laser beam however the electron beam process utilises a vacuum chamber in which is generated a high energy density beam of electrons of the order of 0 25 2 5 mm in diameter fig.

The higher the vacuum the less amount of contamination and residual gasses will be present when the welding occurs. Prior welding the specimens were fixed by clamps which pressing the four corners of the plates as shown in fig. The process variables are. Electron beam welding was used for joining al6061 t6 precision machined cylindrical sections.

This high speed stream of electrons is tightly focused using magnetic fields and applied to the materials to be joined.