July 3, 2019

What is Socket Weld Pipe Fittings

Socket weld pipe fittings is a family member of forged steel fittings, which used for small bore pipes and piping systems (generally below 4 inches). We usually manufacture them according to ASME B16.11 standard.

ASME B16.11 Standard

Standard of ASME B16.11 covers ratings, dimensions, tolerances, marking and material requirements for socket-welding fittings. These fittings are designated as Class 3000, 6000, and 9000. B16.11 is to be used in conjunction with equipment described in other volumes of the ASME B16 series of standards as well as with other ASME standards, such as the Boiler and Pressure Vessel Code and the B31 Piping Codes.

Types of Socket Weld Pipe Fittings

Types of Socket Weld Pipe Fittings


Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel, Copper Nickel and Nickel Alloy.

Carbon Steel Socket Weld Fittings

ASTM A105, A694 F52, F60, F65, F70, A350 LF2, LF3

Alloy Steel Forged Steel Socket Weld Fittings

ASTM A182 F1, F5, F9, F11, F12, F22, F91

Stainless Steel Socket Weld Fittings

ASTM A182 F304/304L/304H, F316/316L, F310, F317, F321, F309, F347, F904L

Duplex Steel SW Pipe Fittings

ASTM A182 F51, F53, F55, F56, F57, F60

Copper Nickel Socket Weld Pipe Fittings

ASTM / ASME SB 111 UNS NO. C10100 , C10200 , C10300 , C10800 , C12000, C12200, ASTM /ASME SB 466 UNS C70600 ( CU -NI- 45/10) , C71500 ( CU -NI- 70/30)

Nickel Alloy Forged Socket Weld Fittings

ASTM / ASME SB 336, ASTM / ASME SB 564 / 160 / 163 / 472, UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 06600 (INCONEL 600 ) , UNS 06601 (INCONEL 601) , UNS 06625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276)


Elbow, Tee, Cross Coupling, Lateral, Union, Cap and Reducing Inserts.

Socket Weld Elbow

Socket Weld Elbow

  • 90 Degree Elbow
  • 45 Degree Elbow
  • Long Radius Elbow
  • Short Radius Elbow
Socket Weld Tee & Cross

Socket Weld Tee & Cross

  • Equal Tee & Cross
  • Straight Tee & Cross
  • Reducing Tee & Cross

Socket Weld Coupling

Socket Weld Coupling
  • Full Coupling
  • Half Coupling
  • Straight Coupling
  • Reducing Coupling

Socket Weld Cap

Socket Weld Cap

Like the threaded plug, socket weld cap is also used to close the pipeline.

Socket Weld Lateral

Socket Weld Lateral

It is a pipe fitting similar to a “Y” which has 45 degree and used to manage the flow of the fluid through it.

Socket Weld Union

Socket Weld Union

It connects two pipes, but is quite different than a coupling, as it allows future disconnection of the pipes for maintenance.

Socket Weld Reducing Inserts

Socket Weld Reducing Inserts

It inserts to another socket weld pipe or fittings, and provides different combinations for to quick connect with different diameter pipelines.

Advantages VS Disadvantages of Forged Socket Weld Pipe Fittings


No need to do end beveling.

No need to do spot welding.

The weld material will not be penetrated into the pipeline hole.

Reduce the risk of leakage compare with threaded pipe fittings.

The fillet weld is not suitable for radio-graphic inspection, so proper fitting and welding is critical. Fillet weld usually use magnetic particle and penetrate to do surface detection.

The cost is lower than butt weld.


Welder shall ensure the welding expansion space between pipe and socket shoulder 1.6mm during welding.

The existence of cracks in welding gap and socket weld, which reduces the corrosion resistance or radiation resistance of the pipeline. When the solid particles are piled up at the socket weld, the pipeline operation and maintenance may fail. In this case, the entire pipe is usually required to be fully welded butt welds.

Socket welding does not apply to ultra-high pressure food industry.