Deep-weld effect

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DLC

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Double-Chamber Machine

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Deep-weld effect

The electrons colliding with the workpiece are decelerated in the metal grid and they transfer their kinetic energy to the component in the form of heat. If the power density in the beam center is higher than e.g. 106 watt/cm² (depending on the material), a small part of the melting volume will vaporize in the center of the point of collision. This allows the subsequent electrons to penetrate deeper into the workpiece. A vapor capillary is formed. The internal pressure of the capillary is in balance with the surface tension of the liquid metal surrounding the capillary and trying to close it.
If the beam, and thus the vapor capillary, is moved relative to the workpiece material will be molten on the front side. This material flows around the capillary and solidifies at its back side. When the vapor capillary penetrates the workpiece completely this process is called through-welding, when it ends in the workpiece it is called welding-in.
The deep-weld effect is the key to narrow and parallel weld seams that are typical for electron beam welding.

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Siehe auch

Through-Welding , Welding-in

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