Butt Weld Fitting

Definitions and Uses

Butt-welded fittings are pipe fittings used to change the path of a pipe (e.g., elbows), reduce or increase the diameter of a pipe bore (e.g., reducers), branch (e.g., tees, crosses), or close off a pipe (e.g., butt-welded caps). They are connected to the piping system by welding to form a permanent, leak-proof piping connection.

Types and Shapes

Butt weld fittings come in a variety of shapes and types, including but not limited to:

● Bend: Used to change the direction or flow of water in a pipeline system. Generally, there are three types of elbows: 45, 90, 180, and 90, while 90 and 180 are also referred to as Long Radius (LR) and Short Radius (SR). Long radius elbow center to face distance is 1.5 times the nominal pipe diameter, and short radius elbow center to face distance is equal to the nominal pipe diameter.

● Tee: A branch from the main pipe into another pipe. Tee with equal diameter tee and reductor, equal diameter tee diameter and main tube diameter are the same, and reductor tee diameter is less than main tube diameter.

● Reductor: Used to alter tube diameter. Reducers have two types: concentric and eccentric reducers. Concentric reducers are generally applied to vertical pipes, and eccentric reducers are applied to horizontal ones.

● Tee: Same as Tee, except that Tee can extend two tubes from the main pipe.

● Caps: Are used to seal the end of a tube. Caps are available in various shapes and sizes, and are suitable for a wide variety of piping systems.

Material Grades and Sizes

Butt weld fittings are available in various grades and sizes for various pipe systems. Commonly used materials are carbon steel, high-yield carbon steel, low-alloy steel, stainless steel, duplex alloy and Ni alloy. Sizes range from 2 inches to 48 inches (and up), with seamless completion of fittings up to 24 inches, and larger sizes by welding.

Manufacturing Processes

The manufacturing process for butt-welded pipe fittings includes a variety of methods, such as cutting, heating, bending, and welding. For smaller diameter fittings (e.g., up to 24 inches), seamless steel tubing is usually used to make them by cutting, heating, and bending. While for larger sizes, the fittings are fabricated using welded pipes or steel plates.

Your Professional Butt Weld Fitting Supplier

Our goal is to become your true partner in the field of butt weld fitting in China. Zhejiang Gangda Flange Pipe Fittings Co., Ltd. is specializes in the production of flanges and pipe fittings. The company has been committed to the manufacturing and research and development of flange pipe fittings for petroleum, petrochemical, power, natural gas and other projects. Our company is committed to applying advanced manufacturing technology and strict quality control standards to every product. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.

Why Choose Us

Quality control

In terms of quality assurance, the company strictly follows the standards and norms of the industry quality system. Adopt industry-leading testing equipment to ensure product quality and good reputation.

OEM/ODM

When you put forward your needs, our engineers will provide you with faster and more perfect customized solutions. We have a wide range of products, and we will provide technical support according to your actual needs to choose the right product for you.

Our service

The company has a professional sales team to provide you with high-quality pre-sales consulting services. During the order production process, customers can communicate with us at any time to understand the production progress. At the same time, we provide high-quality after-sales service to meet the different needs of customers.

Advantages of Butt Weld Fitting

Corrosion resistance

Butt weld fittings excel in corrosive environments, making them suitable for chemical processing and pharmaceutical applications.

High strength

The alloy’s composition provides remarkable strength, allowing these fittings to withstand high-pressure conditions.

Extended lifespan

The alloy’s resistance to corrosion contributes to the longevity of pipelines and systems.

Oxidation resistance

Butt weld fittings maintain their integrity in environments with high levels of oxygen and heat.

Wide chemical compatibility

These fittings thrive in environments containing sulfuric acid, hydrochloric acid, and other corrosive chemicals.

Versatility

Butt weld fittings are suitable for industries ranging from chemical processing to pollution control.

Specification Parameter of Butt Weld Fitting

Pipe Size		OD at Bevel	D	Approx. Weight
NPS	DN	OD at Bevel	D	Std	XS	XXS
		mm	mm	kg	kg	kg
0.51	16	-	-	0.2	0.4	-
0.751	19	-	-	0.2	0.4	-
1	25	33.4	25.0	0.7	0.7	0.9
1.25	32	42.2	32.0	0.9	1.1	1.8
1.5	40	48.3	38.0	0.9	1.5	2.4
2	50	60.3	51.0	1.8	2.6	4.4
2.5	65	73.0	64.0	4.0	4.6	8.4
3	80	88.9	76.0	5.7	7.7	12.8
3.5	90	101.6	89.0	7.7	9.9	18.7
4	100	114.3	102.0	9.9	13.4	24.3
5	125	141.3	127.0	16.5	24.3	41.9
6	150	168.3	152.0	26.5	39.7	70.5
8	200	219.1	203.0	50.7	77.2	132.3
10	250	273.0	254.0	94.8	116.8	-

Customizable options of Butt Weld Fitting

Forge and fittings has enjoyed extended success in commodity and custom butt weld fittings. This type of fitting has numerous applications, and we have the experience to build yours to suit your specific need, such as buttweld pipe fittings. From your drawings and specs, we will deliver your custom butt weld fitting to you on time at a competitive price.

Precautions for Use Butt Weld Fitting

When welding pipe fittings, first inspect the relevant materials to ensure their quality is qualified. Before welding, heat the pipeline to the specified preheating temperature. When performing butt welding on the fittings, it is necessary to control the welding time and heating time reasonably, and use corresponding welding techniques and equipment to ensure the welding quality. When using electronic equipment for welding, special attention should be paid to the stability of the current. After completing the butt weld fittings, quality inspection must be carried out. First, the appearance of the fittings needs to be inspected to confirm the presence of weld cracks and other defects; secondly, advanced inspection methods like radiographic testing need to be used to detect welding defects. Follow-up processing work is also required.

When grinding the weld seam, attention should be paid to the intensity and angle of grinding. In addition, painting and labeling operations should be carried out on the welding area. After the installation of butt weld fittings, relevant maintenance work is also required. During maintenance, operations such as cleaning, inspection, and replacement of pipelines should be carried out to ensure the safety and stability of the fittings.

Quality Testing of Butt Weld Fitting

Appearance inspection: After welding is completed, the first step is to conduct a visual inspection. Check whether the shape of the weld seam is regular, and whether there are defects such as porosity, slag inclusion, and lack of fusion on the surface of the weld seam. The excess height of the weld seam should meet the design requirements. Excessive excess height can cause stress concentration, while insufficient excess height May affect the strength of the weld seam.

Non destructive testing: Perform non-destructive testing based on the pressure rating and usage requirements of the pipeline system. If radiographic testing, ultrasonic testing and other methods are used to inspect whether there are defects inside the weld seam. For some important pipeline systems, non-destructive testing is a crucial step in ensuring welding quality and safe system operation.

Pressure test: After the installation of the pipe fittings is completed, a pressure test should be conducted. Conduct a pressure test at a certain multiple of the design pressure (such as 1.5 times) to check for leaks in the pipeline system, including the welded parts of the fittings. Only after passing the pressure test can it be officially put into use.

Packaging and Shipping of Butt Weld Fitting

Packing	Wooden box or pallet or carton
Shipping	Container transport, by sea.

FAQ

Q: What is the difference between socket weld and buttweld fittings?

A: A socket weld fitting fits over the outside of the pipe it is being welded to whereas a butt weld is the welding of two of the same sized diameters joined end to end. A socket weld fitting fits over the outside of the pipe it is being welded to.

Q: What is a buttweld fitting?

A: A buttweld fitting is a weldable pipe fitting that allows for change of direction of flow, to branch off, reduce pipe size or attach auxiliary equipment. Forged Steel buttweld fittings are manufactured in accordance with ANSI / ASME B16. 9.

Q: What is the difference between socket weld and threaded fittings?

A: Strength and Reliability: Socket weld fittings offer superior strength and reliability due to welded connections, ensuring leak-proof seals. Threaded fittings, relying on threads, may be prone to leakage.

Q: When to use socket weld?

A: In most cases, socket weld is used to join pipe segments that are too long or too narrow to fit together. It is constructed of stainless steel and has excellent corrosion resistance. Moreover, it is simple to install inside the fitting, and it does not generate any vibrations even when subjected to high pressure.

Q: Why do socket welds need a gap?

A: A gap between the two pipes in a socket weld means the difference between a good weld and a bad weld. Socket welding gap rings are used to eliminate cracked welds by providing a space for the pipe to expand into as it becomes warmer in temperature.

Q: What is the rating of socket weld fittings?

A: Socket Weld Fittings are available in pressure ratings of 3000, 6000, and 9000 #. Socket Weld Fittings are covered under ANSI / ASME B 16 11. Socket weld fittings are available up to 4 inch nominal.

Q: What is the maximum gap for socket welds?

A: In assembly of socket weld joints, the pipe or tube shall be withdrawn a distance of approximately 1/16 in. away from contact between the end of the pipe and the face of the shoulder of the socket.

Q: Is a socket weld a fillet weld?

A: Socket welds involve inserting a pipe into a recessed area of a fitting, flange, or valve. The weld is then applied around the outer circumference of the pipe, creating a fillet weld. This method is particularly useful for small-diameter pipes because it is simple and easy to install.

As one of the most professional butt weld fitting manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to buy customized butt weld fitting from our factory.

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