Welding of tantalum
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Weldability of tantalum
Any weld in the welding of tantalum must be done in an atmosphere free from contamination. This requires not only the weld pool, but all metal needs to be protected. To ensure the protection of use of four technologies:
- Electron beam welding — requires modern equipment. Most welding done in a vacuum chamber. In this case, it is possible to obtain a sophisticated welds in hard to reach areas, in particular, when non-detachable connection of tees of different cross sections;
- Welding in shielding gases, where it provides a constant gas purge. Method used when power consumption is large and the nature of the connection is too complicated to provide a welding in the usual ways. Case to create a protective shell is usually made from polythene sheet and masking tape. Argon flowing through the housing, displaces or mixes the entrapped air in the area of the weld. Argon should be ignored as long as the welding spot has cooled to room temperature;
- A variation of the previous method is the welding of tantalum in a vacuum chamber. This provides the best conditions for flow of an inert gas. Welded parts are arranged in the welding chamber, after which the area of the welding operation is sealed. After pumping the air chamber is filled with high-purity argon under slight positive pressure. Welding is performed using rubber gloves, which are placed on both sides of the camera;
- Conventional welding of tantalum in the air is fundamentally also possible, but only when taking the most stringent precautions. Possible only relatively simple compounds, allowing for adequate shielding. It is necessary to ensure the protection of the arc, metal front and side, of the cooling elements behind and under the weld. Protective atmosphere is provided by a weak gas flow from the cylinder.
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The problems and peculiarities of welding of tantalum
Coating the inert gas must be provided with properly designed rear screens, which provide a glow of gas until, until the metal has cooled below the critical temperature. Should also be used by the backup shielding on the underside from the weld bead. This provides protection to the weld zone as long as the billet of tantalum will not be chilled.
Tantalum can be welded by a consumable electrode (TIG), however, should ensure reliable protection of the welding zone. However, this method is seldom used due to unfavorable working conditions for the welder.
Characteristically, the tantalum during welding permits a small change in color at the time (up to a dark straw color). To avoid loss of metal, the process is conducted exclusively in a sealed chamber filled with an inert gas. The presence of nitrogen is not a critical symptom, although a few discolor the finished weld.
The vacuum chamber used for electron beam welding, while the cameras used for inert gas welding using the TIG method.
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