Socket Weld Flange/SW Flange

Socket Weld Flange

A socket weld flange, simplified as SW flange, has a recessed area (like a shoulder) in the flange bore. This shoulder serves as a guide to set the depth of the pipe that is inserted into the flange. A socket welding flange is initially designed for a high-pressure, small-diameter piping system.

How to Use

Insert the pipe end into the socket weld flange until the pipe bottom touches the shoulder area, pull back 1.6mm (1/16”) distance of the inserted pipe, then do fillet welding. The point is to create an expansion gap (1 fillet weld) between the flange and the pipes or fittings.

Socket Welded Flange Face Types

Socket welded flange face types, including RF type and RTJ type, are used with other types of welding flanges (slip on, weld neck, or blind flange).

Advantages

1. Socket weld flange could replace a threaded flange to minimize the risk of leakage.
2. No need to bevel before welding.
3. Welding work outside of the pipe will not penetrate the pipe bore
4. It offers the same internal pressure capacity as slip-on flanges while improving fatigue resistance.

Production Process