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What are Socket weld fittings?

The bottoming clearance in a socket weld is commonly used to alleviate residual stress at the weld's root that may occur during the weld metal's solidification, as well as to allow for differential expansion of the mating parts. Techtube is the best supplier and manufacturer of socket weld fittings. Let's go. 


What is a socket weld fitting? 

A socket weld is a pipe extension characteristic that pertains to injecting a pipe into a recession in a valve, fitting, or flange. Socket Weld fittings, in a contrast to buttweld fittings, are mostly used for tiny pipe diameters (Small Bore Piping), often piping with a nominal diameter of NPS 2 or less.

Fillet-type seal welds are obtained to link pipe to valves and other fittings, as well as to other regions of pipe. Where the benefits of excellent leakage integrity and structural strength are important design considerations, socket welded joints are a desirable solution.

Due to the use of fillet welds and abrupt fitting geometry, fatigue resistance is lower than that of butt-welded construction, but it is still better than that of typical mechanical joining.


Advantages and Disadvantages of Socket Weld fittings


  1. For weld preparation, the pipe does not need to be beveled.
  2. Because the fitting assures good alignment, in theory, no temporary tack welding is required for alignment.
  3. The weld metal is unable to penetrate the pipe bore.
  4. They can be used instead of threaded fittings, reducing the danger of leaking.
  5. Because radiography is not possible on the fillet weld, proper fitting and welding are essential. Surface examination, magnetic particle (MP), and liquid penetrant (PT) inspection procedures can all be used to inspect the fillet weld.
  6. Because there are no stringent fit-up requirements and no special machining for butt weld end preparation, construction costs are lower than with butt-welded connections.



  1. The welder should ensure an expansion gap of 1/16 inch (1.6 mm) between the pipe and the shoulder of the socket.
  2. The expansion gap and internal spaces vacated in socket welded networks facilitate deterioration and make them minorly suitable for corrosive or radioactive plasters where solids hype at the seams may result in operating or sustenance problems. Normally assign butt welds in all pipe sizes with exact weld penetration to the inner of the piping.
  3. Socket welding is incompatible with Ultrahigh Hydrostatic Pressure (UHP) in Food Industry applications since they do not allow full penetration and remove overspread and openings that are very hard to tidy up, developing basic leaks.


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***Monel, Hastelloy, Inconel, Incoloy, SMO254, Nitronic, AL6XN, Stellite, Sanicro, Tantalum, Nimonic , Alloy A286, Invar, Cupronickel etc., are the trademarks of their respective companies.

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