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What is a Flange?

Socket Welding Flanges, SW Flange

Socket-Weld Flanges has a female socket in which pipe is fitted. Fillet welding is done from outside on the pipe.
Socket Welding Flanges

The counterbore is slightly larger than the O.D. of the matching pipe, allowing the pipe to be inserted into the flange similar to a slip-on flange.

The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension.

Socket Welding Flanges, SW FlangeThe diamter of the smaller bore is the same as the I.D. of the matchine pipe A restriction is built into the bottom of the bore which sets as a shoulder for the pipe to rest on.

This is eliminates any restriction in flow when using a socket welding flange.
Standards, Dimensions & Weight
The Socket Welding Flange is attached to the pipe by a fillet weld around the hub of the flange. An optional internal weld may be applied in high stress applications.
Specifications of Socket Welding Flanges:

This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).

Details of Welding Neck flange

1. Weld Neck flange 2. Butt Weld3. Pipe or Fitting

Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Material of Socket Welding Flanges:
Cabon steel: A105, A350 LF2
Stainless steel: A182 F304/F304L/F316/F316L/F321
Alloy steel: F11, F12
Packing: plywood case and plywood pallet

Advantages and disadvantages of Socket Weld fittings

The pipe need not be beveled for weld preparation. Temporary tack welding is no needed for alignment, because in principle the fitting ensures proper alignment.
The weld metal can not penetrate into the bore of the pipe.
They can be used in place of threaded fittings, so the risk of leakage is much smaller. Radiography is not practical on the fillet weld; therefore correct fitting and welding is crucial. The fillet weld may be inspected by surface examination, magnetic particle (MP), or liquid penetrant (PT) examination methods.
Construction costs are lower than with butt-welded joints due to the lack of exacting fit-up requirements and elimination of special machining for butt weld end preparation.



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