Hikelok miniature butt-weld fittings are mainly used in ultra-purity environment in semiconductor industry and are suitable for pipeline connection of high-purity media. It is a welded fitting. Its main structural forms include straight union, elbow, tee and cross. It has the characteristics of small volume, accurate size of welding end, flat end face, sharp edge without burr, uniform tube wall, accurate welding and improving the repeatability of welding.
Welding mode
It is recommended to adopt tungsten arc welding (GTA), which shall be carried out according to the welding procedures and requirements in SEMI F78-0304 standard, and evaluated according to SEMI F81-1103 standard. The welding of miniature butt-weld fittings shall be carried out by professional automatic welding machines. Systematic and standardized welding management can ensure the welding quality of products.
Automatic track argon arc welding machine
Structural features
The standard polishing roughness of inner channel of miniature butt-weld fittings is 10μin. (0.25μm) Ra, electropolishing up to 5μin. (0.13μm) , the corner of the flow channel in the elbow fitting is a circular connection without interception area, which is convenient for the smooth transition of the medium.
Material requirements
316L, 316L VAR and 316L VIM-VAR stainless steel are used as processing raw materials, which meet the requirements of SEMI F20-0704 standard. The fittings of these three materials can withstand temperature from - 198 ℃ to 454 ℃. According to ASME B31.3, the maximum working pressure can reach 8500 psig.
Connection forms
The miniature butt-weld fitting is mainly used for butt welding connection with the ultra-purity series of nuts and glands. It is suitable for the system layout with compact space. The figure shows the welding diagram of miniature butt-weld tee and components. According to different layout schemes, miniature butt-weld 90°elbow and cross can also be selected for welding.
For more ordering details, please refer to the selection catalogs on Hikelok's official website. If you have any selection questions, please contact Hikelok's 24-hour online professional sales personnel.
Post time: May-26-2022