How are boiler joints classified?

Boiler joints are primarily classified into two categories: welded joints and bolted joints. Welded joints provide a strong, permanent connection, often used in high-pressure applications, while bolted joints allow for easier disassembly and maintenance. Additionally, they can be further categorized based on their design, such as lap joints, butt joints, or flanged joints, depending on the specific application and requirements of the boiler system.