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Socket Weld Flange

Socket weld flange simplified as SW flange, it 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 inserted to the flange. Socket welding flange initially designed for high pressure small diameters piping system.

Our Supply Range:

Standard: Carbon steel ASTM A105, ASTM A350 LF1/2, ASTM A181 Alloy steel ASTM A182 F5, F9, F11, F22, F91 Stainless steel ASTM A182 F304/L, F316/L Outer Diameters: 1/2 inch to 24 inch, up to 2500# Special made: 24” to 60”, up to 900# Wall Thickness: Schedule 40 to 160 Pressure Ratings: Class 150 to Class 2500

How to Use

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

How is Socket Welding Flange Generated

The socket welding flange was firstly to use for stainless steel superheater, due to avoid cracking defects caused by thermal stresses in heating processes, and after years development it became a standard applications for all types of material.


  • Socket weld flange could replace threaded flange, to minimize the risky of leakage.
  • No need to beveling before welding.
  • Welding work outside of the pipe, will not penetrate the pipe bore
  • It is recommended for applications where internal welding operations are particularly difficult. This sock welded construction eliminates internal pockets while avoiding warpage of welding heat and damage to the flange face caused by weld spatter. It has the same internal pressure as the sliding on the flange, and has a better fatigue life.

Related Products

  • Weld Neck Flange
  • Blind Flange
  • Socket Weld Flange
  • Slip On Flang
  • Lap Joint Flange
  • Threaded Flange
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