Butt welding pipe fittings are a kind of pipe fittings with better quality made of welded pipes. They are widely used in the construction industry. They mainly include butt welding pipe fittings made of stainless steel, carbon steel, low alloy steel, and alloy steel. Compared with ordinary welded pipe fittings, butt-welded pipe fittings have more durable characteristics, and are not easy to deteriorate due to the influence of external environmental conditions. Butt-welded pipe fittings play an indispensable role in construction engineering and are used by people There are more types of welded pipe fittings products.
1. Classification: Commonly used butt welding pipe fittings are mainly divided into elbows, tees, different diameter pipes (big and small heads), and pipe caps. Among them, elbows, tees, and reducers are mostly made of seamless steel pipes or welded steel pipes. It is made by making, drawing, and extruding, while the pipe cap is mostly made of steel plate stamping.
Elbows: According to different sizes, elbows are divided into long-radius elbows and short-radius elbows; according to different manufacturing methods, they are divided into push elbows, extrusion elbows, and welded miter elbows.
Tee: According to the size of the caliber, the tee is divided into equal diameter tee, different diameter tee, and Y-shaped tee.
Reducer: Reducers usually have concentric reducers and eccentric reducers.
Caps: Caps are usually divided into flat caps and standard oval caps. Among them, the flat cap is easier to manufacture and the price is lower, but its pressure-bearing capacity is not as good as that of the standard elliptical head, so it is often used under the conditions of DN≤100 and medium pressure lower than 1.0MPa. The standard elliptical pipe cap is an elliptical head with a folded edge. The ratio of the inner diameter of the ellipse to the long and short axis is 2:1. It is the most widely used head.
2. Commonly used standards: Commonly used standards for butt welding pipe fittings include: "Steel Butt Welding Seamless Pipe Fittings" GB/T 12459—2005, "Steel Steel Butt Welding Pipe Fittings" GB/T 13401—2005, "Steel Butt Welding Pipe Fittings for Power Stations" 》DL/T 695—1999, SH 3408 steel butt welding seamless pipe fittings, SH 3409 steel plate butt welding pipe fittings, SH 3410 forged steel socket welding pipe fittings, HGJ514-87 carbon steel, low alloy steel seamless butt welding pipe fittings, ASME/ANSI B16.9 Factory-made seamless steel pipe butt-welding fittings, ASME/ANSI B16.11 socket weld and thread forged fittings, ASME/ANSI B16.28 steel butt-welding small radius elbows and return bends, ASME B16.5 Pipe Flanges and Flange Fittings, MSS SP-43 Forged Stainless Steel Butt Weld Fittings, MSS SP-83 Socket Weld and Thread Unions, MSS SP-97 Integral Reinforcement of Socket Weld, Thread and Butt Weld Ends Type pipe seat, ASME B16.3-1998 malleable cast iron threaded pipe.
