6/12/2023 0 Comments Webdesign dortmund![]() with high frequency thus one can control the temperature field before the melt zone, in the melt zone and after the melt zone. All EB guns are independently electrically controlled, i.e. One can place such guns after the main ones for annealing. For preheating purposes one can place additional 3-4 kW EB guns which will precede the main ones. For instance, in order to additively melt a Ti6Al4V wire 6 mm in diameter the EBAM system is to generate the beam power within 1.5 к W, the accelerating voltage of 5 kV and the beam current of 300 mA. Our four-gun modular wire-feed system guarantees the uniform heat distribution in the heating zone. At present we incorporate four small electron guns in a single wire-feed EBAM system. Small dimensions of our electron guns make it possible to assemble a modular multi-beam system. For example, one can obtain the beam power of 10 kW by having the accelerating voltage of 6 kV. The beam current increases several-fold proportionally decreasing the accelerating voltage. The optical conversion of the electron beam makes it possible to ensure a desired distribution of its power in the heat affected zone. I discovered how to optically transform a line electron beam into an asymmetric beam profile. So the only option to enhance the beam power is by increasing the accelerating voltage, and high accelerating voltage generates high X-ray radiation in the melt zone. The main drawback of the asymmetric guns is the inability to employ high beam currents. Asymmetric beam guns cannot effectively solve such problems. When I started developing my electron gun for AM and not for dagger welding, I fully realized that in order to be able to cope with the problems mentioned above, my EBAM system should consist of several electron guns – i.e. Using such electron guns for additive process is like ploughing soil by a tractor equipped with a jet engine. In order to mitigate problems arising out of use of one big and powerful electron gun, AM machine manufacturers resort to electron beam scanning and rastering which significantly increases the price of the AM machine and makes it more complex and heavy. Sadly, it should be noted that one traditional electron gun will not be able fulfil the five points of optimal AM process listed above. These guns have large dimensions, which makes it difficult to incorporate several such type of guns into a single AM machine. ![]() cm since such guns were originally meant by von Ardenne for the dagger welding. These electron guns generate axisymmetric electron beam with a high power density – up to 10 8 W per sq. To be able to ensure high stability of the AM process.Īt present everyone in AM industry uses electron guns designed and developed 70 years ago by Manfred von Ardenne.To be able to uphold minimal temperature gradients in the melt zone – by preheating the wire (preferably by the electron beam) and by the subsequent annealing of the additively made item (also preferably by the electron beam).cm, because these levels of power density prevent the vaporization of the melted wire thus protecting the stoichiometry of the additively melted metal To be able to ensure minimal power density - below 10 4 W per sq.To be able to melt the wire in a laminar way by keeping temperature gradients minimal.To be able to do uniform heating of the fed wire from all sides of the wire.What should an optimal wire-feed electron gun be able to do in order to ensure a good additive process? What are the features of an optimal wire-feed electron gun?
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