How to turn the butt welding flange and what is the butt welding flange

It is not difficult to turn the butt welding flange, and when the flange neck is processed, the supporting plate of the tool part should be aligned with the machining degree.

We have a simple formula for machining here: Root Neck Size - Mouth Neck Size Neck Height Size *e.g. ANSI CL150 24"American standard butt welding flange, root neck size) diameter size) neck height size) * degree.

If the degree of the butt welding flange is slightly larger, the above formula cannot be used, and the degree needs to be found out by the tangent of the function table.

The butt welding flange is also known as the high neck flange, which is different from other flanges in that there is a long and inclined high neck from the flange and the pipe weld to the flange, and the wall thickness of this section of the high neck gradually transitions to the thickness of the pipe wall along the height direction, which improves the stress discontinuity and thus increases the flange strength. Butt welding flange pressure rating:. The butt welding flange is mainly used in the occasion of harsh working conditions, such as the thermal expansion of the pipeline or other loads that cause the flange to be subjected to large stress or repeated stress changes; Pipelines with large fluctuations in pressure and temperature, or pipelines with high temperature, high pressure and low temperature below zero.

Flat weld flange is also known as lap weld flange. The connection between the flat welded flange and the pipe is to insert the pipe into the inner hole of the flange to the appropriate position, and then lap weld, which has the advantage that it is easier to align during welding and assembly, and is cheaper, but the flat welded flange is only suitable for the pipeline system with relatively low pressure level, pressure fluctuations, vibrations and ** are not serious.

The disc with the neck behind the machining is machined first, and then the inner hole is processed.

The butt welding flange is a high neck flange, and the connection with the pipe is the method of butt welding.

1. The flange is easy to weld beautifully.

2. After the flange is aligned and fixed, the flange is placed in the welding position of the flat fillet seam, and then you can weld a quarter of the speed and then to the opposite side of the weld, so that the welding of the opposite side is finished, and the second line starts in a place until the welding is completed.

3. The welding elements of beautiful flat fillet seams;

Choose the appropriate welding current, the current is relatively larger.

Determine the appropriate welding rod angle, the width of the transport rod should be small, it should be stable, the arc should be short, the arc should be suppressed, and the weld pool should be seen.

Pay attention not to pollute the surface of the pipe and flange in the arc striking, and fill in the arc closing point.

It is necessary to weld a welding rod in one go.

4. Pay attention to pad the flange with insulator to avoid damaging the flange contact surface due to improper contact.

The flange is actually very good for welding, you can weld a few fixed points after the position is aligned, you can weld a quarter of the speed of welding, and then a quarter of the opposite side of the welding, so that the welding of the edge to the edge of the head road, the second line will start along a place until the welding is completed, so that the welding is beautiful.

How to weld flange welding better, listen to the old welder's more than 20 years of welding experience.

The level of the welder is good enough for nothing else.

Butt welding flange is a kind of pipe fitting, which refers to the flange with a neck and a round pipe transition and connected with the pipe butt welding.

Scope of application: butt welding flange is suitable for pipelines with large fluctuations in pressure or temperature or pipelines with high temperature, high pressure and low temperature, and is also used for pipelines transporting expensive, flammable and explosive media. The butt welding flange is not easy to deform, the sealing is good, and it is widely used, and the nominal pressure PN is about 16MPa.

Common production standards: HG T20592-2009, HG T20615-2009, GB

Materials: 1, cast steel 2, carbon steel 3, stainless steel 4, alloy steel.

When it comes to flanges, you may be unfamiliar with this name, but it is widely used in our lives, in the connection of various pipe fittings, turning parts, you can see the flange, it mainly plays the role of connecting two pipe fittings, and it is also a kind of pipe fittings. Flanges can be divided into butt welding flanges and flat welding flanges according to their different welding methods with pipe fittings.

First, the production process of butt welding flange

1. Centrifugal casting.

First of all, the raw materials are melted in a furnace, and the temperature reaches more than 1600 degrees Celsius, in order to prevent the molten steel from solidifying immediately after injecting into the mold, the mold should be heated at the same time and maintained to a temperature of more than 800 degrees Celsius; Start the centrifuge and inject the molten steel into the preheated mold, wait for the mold to cool naturally to about 800 degrees Celsius, stay for about 10 minutes, and finally pour it with cold water to make the material temperature close to room temperature, take out the casting, so that the casting flange is ready.

2. Free forging.

First of all, the cross-section of the raw material should be forged longitudinally to increase the cross-section; Then the raw material is lengthened to increase the length of the material according to the actual needs; It is then punched perpendicular to the cross-section to create a mid-pass or solid flange; Then, according to the needs of practical application, the material is bent at a certain angle, so as to connect two pipe fittings in different directions according to the need; Finally, the material is cut according to the actual required length.

3. Die forging. As the name suggests, die forging is to use special molds to manufacture flanges, which has high manufacturing efficiency, and the best products are, of course, more expensive than open forging flanges. Die forging should first inject the processed raw materials into the mold, continue to add the letter to guess the dry heat, make the material and the mold fully fit and then cool, and finally take out the flange for punching, trimming, polishing and other operations, so that the die forging flange is ready.

2. Specifications and parameters of butt welding flanges

1. Inner diameter of bolt hole: 50mm-2130mm;

2. Bolt hole outer diameter: 11mm-30mm;

3. The thickness of the trillion flange: 12mm-58mm;

4. Flange inner diameter: type A (18mm-2036mm), type B (15-2024mm);

5. Flange outer diameter: type A (, type B (14mm-2020mm);

6. Flange weight:

3. Butt welding flange reference**

1. Brand: Weiyan.

Product: Forged neck flange.

Model: WY-003

**: 15 RMB.

Minimum quantity: 50 kg.

2. Brand: Xinhu.

Product: Carbon steel butt flange.

Model: DN15

**: RMB.

Minimum quantity: 20pcs.

Fourth, the difference between butt welding flange and flat welding flange

1. The main difference between the two flanges is that the welding method is different from that of pipe fittings, flat welding flanges only need to be welded on one side, while butt welding flanges need to be welded on both sides;

2. The butt welding flange is usually a neck flange, while the flat welding flange does not, if the safety requirements are relatively high, it is best to use the butt welding flange.

In HG, the standards for butt welding flanges, level-destruction bi welding flanges, and socket welding flanges are different. In addition, the diameter and wall thickness of the pipe at the interface end are the same as the pipe to be welded, and the two pipes are welded together.

The flat welded flange is a concave platform that is slightly larger than the outer diameter of the pipe at the interface, and the pipe is inserted and welded inside.

The welding performance of butt welding is relatively good, and the corrosion is relatively small.

Flat welding flanges are generally used for low and medium pressure pipelines, butt welding flanges are used for the connection of medium and high pressure pipelines, and the flanges of butt welding are generally at least, and butt welding is used to reduce stress concentration.

Features of various flanges:

Socket welding flanges are suitable for small-diameter, high-pressure, high-temperature pipe connections.

Flat welding is like butt welding, there is a boss with a groove on the boss, and then the pipe is inserted into it for welding.

Socket welding is that there is no boss, and a groove is directly opened on the flange body, just like a hole is opened on the blind flange, and then a groove is opened in the fiber.

Flat welding has a slightly better welding performance than socket welding.

Axle flange welding, Zhou Chanqiao, using Anjia butt welding machine.

Bottom bridge flange flash butt welding machine is a flash butt welding machine for welding automobile bottom bridge flange tailored by Anjia for customers according to customer needs, according to product materials and welding processes.

The weld of this butt welding machine is formed by butt welding at one time, and there is no need to open the groove before welding, and there is no need to fill in the welding wire welding, which saves the labor and welding material costs required for the opening groove, and the weld is stable after welding, the strength is high, and the strength of the base metal can be reached, and the post-welding flaw detection no longer has welding slag and porosity, and the welding process equipment itself can monitor the welding quality and ensure the welding quality.

Butt welding flanges can only be machined by forging because of their special shape.

Generally, it is produced by tire die forging, die forging, rolling and free forging.

Die forging is used for small size and large quantity, and tire die forging is used for small quantity.

Rolling is used for large size and large quantity, and open forging is used for small quantity.