Which type of fittings are typically used for joints in a refrigeration system with Freon?

In refrigeration systems that utilize Freon, soldered or brazed fittings are commonly employed for joints. The reason for this is that soldering and brazing provide a strong, leak-proof connection that can withstand the pressures and temperatures associated with refrigeration systems. These methods create a continuous metallic bond, which enhances the system's integrity and durability over time.

Soldered joints use filler metal that melts at a relatively low temperature, while brazed joints involve filler metals with a higher melting point. Both techniques ensure that the materials join without significant structural changes, which is critical in maintaining the efficiency of the refrigerant flow and preventing leaks.

In contrast, while welded fittings can offer a robust connection, they require specialized equipment and skills and may not be as flexible in terms of servicing and modifications. Screwed fittings may be easier to install but can lead to potential leakage points under high pressure. Flanged fittings are generally used in systems that necessitate frequent disassembly or maintenance, but they are not as common in sealed refrigeration lines that operate under specific pressure and temperature conditions. Therefore, soldered or brazed fittings are the most suitable choice for ensuring reliable operation in Freon refrigeration systems.