Butt Weld Fittings

Teshi Fittings is a top manufacturer of Buttweld Fittings,
offering a diverse range of sizes up to 6800NB to meet a wide array of
industrial requirements.

Types of Butt Weld Fittings

Butt Weld Cap

Butt Weld Coupling

Butt Weld Reducer Tee

Butt Weld Elbow

Butt Weld Nipple

Butt Weld Cross

Butt Weld Equal Tee

Butt Weld Stub Ends

Concentric Reducer

Eccentric Reducer

Standard Specification of Butt Weld Fittings

DimensionsANSI ASTM A403 / ASME SA403, ANSI B16.9, ASME B16.25, ASME B16.28, MSS SP-43.
Size1/2″ (15 NB) to 48″ (1200NB)
TypeSeamless / ERW / Welded / Fabricated
DINDIN2605, DIN2615, DIN2616, DIN2617, DIN28011
ENEN10253-1, EN10253-2
ScheduleSCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
FormEnd Caps, Pipe Caps, Pipe End Caps.

Material & Grades of Butt Weld Fittings

Stainless Steel Butt Weld FittingsASTM A403 WP316/316L, ASTM A403 WP304/304L, ASTM A182 F316L, 304L, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L
Duplex & Super Duplex Steel Butt Weld FittingsASTM A 815, ASME SA 815 UNS NO S31803, S32205. UNS S32750, S32950. Werkstoff No. 1.4462
Carbon Steel Butt Weld FittingsASTM A234, ASME SA234 WPB , WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70.
Low Temperature Carbon Steel Butt Weld FittingsASTM A420 WPL3, A420 WPL6
Alloy Steel Butt Weld FittingsASTM / ASME A/SA 234 Gr. WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 91
Nickel Alloy Butt Weld FittingsASTM B336, ASME SB336, Nickel 200 (UNS No. No2200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II), Cupro-Nickel 70/30, CuNi10Fe1Mn, CuNi30Mn1Fe.

Manufacturing Process and Features of Butt Weld Fittings

The manufacturing process of butt weld fittings involves several key steps to ensure their structural integrity and suitability for diverse applications. Here’s an overview of the process and the distinctive features of butt weld fittings:

Manufacturing Process:

  • Material Selection: Butt weld fittings are typically fabricated from materials such as stainless steel, carbon steel, or alloy steel. The choice of material is based on factors like corrosion resistance, strength, and temperature resistance.
  • Cutting: The selected material is cut into appropriate sizes and shapes using precision cutting techniques. This ensures consistency and accuracy in dimensions.
  • Forming: The cut material is then shaped into fitting forms through either cold forming or hot forming processes. In cold forming, the material is shaped at room temperature using mechanical presses or other equipment. In hot forming, the material is heated to a suitable temperature before shaping to enhance malleability and formability.
  • Heat Treatment: After forming, the butt weld fittings may undergo heat treatment processes to modify their microstructure, improve mechanical properties, and relieve residual stresses.
  • Machining (if necessary): Additional machining processes may be employed to refine the surface finish, ensure dimensional accuracy, or create specific features on the fittings.
  • Inspection and Testing: Comprehensive quality control measures are implemented to inspect the butt weld fittings for dimensional accuracy, surface finish, and structural integrity. Various non-destructive testing methods may be used to detect any defects or imperfections.
  • Surface Treatment: Depending on the application requirements, butt weld fittings may undergo surface treatments such as coating, plating, or passivation to enhance corrosion resistance and prolong service life.
  • Machining (if necessary): Additional machining processes may be employed to refine the surface finish, ensure dimensional accuracy, or create specific features on the caps.
  • Inspection and Testing: Comprehensive quality control measures are implemented to inspect the butt weld caps for dimensional accuracy, surface finish, and structural integrity. Various non-destructive testing methods may be used to detect any defects or imperfections.
  • Surface Treatment: Depending on the application requirements, butt weld caps may undergo surface treatments such as coating, plating, or passivation to enhance corrosion resistance and prolong service life.

Features of Butt Weld Fittings:

  • Seamless Integration: Butt weld fittings provide a seamless transition in piping systems, ensuring smooth flow and minimal turbulence.
  • Leak Resistance: The welded construction of butt weld fittings ensures a tight, leak-proof seal, eliminating the risk of fluid or gas leakage.
  • High Strength: Butt weld fittings are fabricated from robust materials and undergo rigorous manufacturing processes, resulting in high strength and durability.
  • Versatility: Butt weld fittings are available in various sizes, materials, and configurations to accommodate a wide range of piping applications across industries.
  • Compliance with Standards: Quality butt weld fittings adhere to industry standards and specifications, ensuring reliability and compatibility with existing piping systems.

Overall, butt weld fittings are essential components in piping systems, offering reliable sealing, structural integrity, and longevity in demanding environments.

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Frequently Asked Questions

Most frequent questions and answers

Butt weld fittings are pipe fittings used to connect sections of pipe in a piping system. They are welded directly to the pipe, providing a permanent, welded joint that offers strong mechanical strength and reduces leak points.

Butt weld fittings are made from a variety of materials, including carbon steel, stainless steel, alloy steel, and more. The choice of material depends on the application and the specific requirements of the piping system.

Butt weld fittings offer significant advantages in piping systems, including high strength and durability due to the seamless welding process, which creates strong, leak-proof connections capable of withstanding high pressures and temperatures. Their smooth internal surfaces reduce turbulence and pressure drop, enhancing flow efficiency, while their resistance to corrosion makes them suitable for harsh environments. Additionally, butt weld fittings are versatile, available in various shapes, sizes, and materials for diverse applications. They typically require less maintenance compared to threaded or flanged connections, providing long-term cost-effectiveness and improved safety by minimizing potential leak points.

Butt welded fittings are generally specified by size, type, material, pressure rating, and end connection. The size refers to the nominal pipe size (NPS) and the schedule (wall thickness) of the fitting, ensuring it matches the piping system. The type indicates the fitting’s function, such as elbow, tee, reducer, or cap. The material is chosen based on the type of fluid or gas in the system, and the temperature and pressure conditions, with common materials including carbon steel, stainless steel, and alloy steel. The pressure rating is specified to ensure the fitting can withstand the system’s operating conditions. The end connection is typically a butt-weld, but may also be a socket-weld or threaded connection. Additionally, fittings are specified by the standards they comply with, such as ANSI, ASME, or MSS, to ensure they meet industry quality and performance criteria.

Butt weld fittings are manufactured according to several key standards to ensure quality and compatibility. The primary standards include ASME B16.9 for factory-made wrought steel fittings, ASME B16.25 for buttwelding ends, and MSS SP-43 for wrought stainless steel fittings. Additional standards such as API 5L and ISO 9001 also play a role, with API 5L addressing requirements for oil and gas pipelines and ISO 9001 ensuring a quality management system. DIN standards and British Standards like BS 3799 provide further specifications, while JIS standards cover Japanese industrial requirements. These standards collectively ensure that butt weld fittings meet rigorous performance, safety, and dimensional criteria for various applications

Butt weld fittings are not always seamless, but they are designed to provide a smooth and strong connection. Typically, the term “seamless” refers to the absence of joints or welds in the pipe itself. For butt weld fittings, the fittings themselves are generally produced with welds but are designed to form a seamless joint when connected to the pipes.
During installation, butt weld fittings are welded directly to the ends of the pipes, creating a continuous, smooth transition with no visible seams or gaps at the joint. This welding process ensures a strong, leak-proof connection that maintains the integrity of the piping system. While the fittings may have seams from their manufacturing process, the finished joint after welding is seamless in terms of functionality and appearance.