CF Series Inner Weld Flanges For Ensuring Reliable Vacuum Sealing Performance In Ultra-High Vacuum Systems​

systems. The CF flange system achieves high vacuum sealing through special metal seal rings. In the CF flange system, the use of bellows (flexible rings) helps adjust the alignment of the flange connection and provides a certain degree of flexibility.

Internal welding flanges typically refer to welding flanges inside the pipeline, making them part of the pipeline. When performing CF series inner weld flanges, the following steps are usually followed:

1. Preparation: Ensure that the bellows and the ports of the pipeline are clean and free from any impurities or dirt to ensure welding quality.
2. Positioning of the bellows: Place the bellows correctly on the ports of the pipeline that need welding and ensure proper alignment. This step is crucial because the correct positioning of the bellows directly affects the quality of the welding and the sealing performance of the system.
3. Welding preparation: Select the appropriate welding method and welding materials based on the materials of the pipeline and bellows. Commonly used welding methods include TIG (Tungsten Inert Gas) welding, electron beam welding, etc.
4. Welding: Weld the bellows to the pipeline according to the selected welding method. Ensure appropriate protection of the welding area during welding to prevent oxidation or other contaminants.
5. Post-welding treatment: After welding is completed, perform necessary post-welding treatments such as removing welding slag, polishing the surface, etc., to ensure the smoothness and flatness of the welding area.
6. Inspection: Inspect the welding area to ensure that the welding quality meets requirements and there are no defects such as cracks or bubbles. Additionally, conduct helium leak testing to ensure the sealing performance of the welding area.
7. Overall testing: After welding is completed, conduct overall system testing to ensure the sealing performance of the flange connection and the stability of the system.

When performing CF series inner weld flanges, special attention should be paid to temperature control and welding quality during the welding process to ensure that the final flange connection has good sealing performance and stability.