Butt welding flanges: their uses and the precautions that should be taken when working with them Sco

Scope and applications of butt welding flanges Butt welding flanges are a type of pipe fitting that have a variety of applications. Flanges with neck and round pipe transitions and butt connections with pipes are what are referred to as butt welding flanges. These flanges are also referred to as split flanges. Pipes can be connected to one another and to the ends of pipes using flanges, which are specialized components. Flanges typically have holes in them, and bolts are used to secure the connection between two flanges. Flange joints are a collective term that refers to flanges that have been butt-welded together, as well as the gaskets and fasteners that go with them. Joints with flanges are an essential component of a variety of different pieces of machinery and components, including pipe design, pipe fittings, and valves.

 

It is not easily deformed, it has good sealing performance, and it is widely used. These are all characteristics that correspond to the requirements for rigidity and elasticity. Transition from butt welding to thinning that is reasonable. After welding, there is no temperature deformation in the joint itself, and the distance between the joint and the joint is quite large. It makes use of a complex bell-shaped structure and is appropriate for pipelines that experience large pressure or temperature fluctuations. It is also appropriate for pipelines that experience high temperature, high pressure, and low temperature. In general, it is utilized for the connection of pipelines and valves that have a PN that is greater than 2. 5MPa. In addition, butt welding flanges can be utilized for the transportation of expensive, flammable, and explosive materials in medium pipelines.

 

Pipe connections are the primary application for flanges. On the pipes that are going to be connected, a variety of flanges are screwed on. Low-pressure pipelines can utilize threaded flanges, while Flange higher-pressure pipelines can utilize butt welding flanges. Both types of flanges can support pressures of up to 4 kg. Insert spacers in the gap between the two flanges, and then secure them with bolts. The primary factor that determines which bolts are used and which pressures they are used at is the thickness of the butt weld flange. Parts of the pumps and valves that are being connected to pipelines must also be fabricated into the appropriate flange shapes. Additionally known as a flange connection. Flanges are a common name for any connecting parts that are bolted and closed on the outside of two planes. This is a common type of connection. In accordance with the nominal diameter, nominal pressure, form code of the sealing surface, designated steel pipe series code, and standard number, the butt welding flange must be marked.

 

alloy steel flange

 

Butt welding flanges have a variety of production specifications, threaded flanges depending on whether they are being used or produced. The actual application value and effect of the butt flange can be guaranteed if the corresponding specifications are followed. Large-scale applications of high-pressure butt-welded flanges include boilers and pressure vessels, as well as applications in the petroleum, chemical, and metallurgy industries, as well as machinery, food processing, and other industries.

 

It is possible to connect butt welding flanges to the pipeline in order to keep the sealing performance of the pipeline intact. Butt weld flanges make it possible to easily replace pipe sections, easily disassemble and inspect the condition of the pipe, and easily seal pipe sections that are made of carbon steel. The connection between two pipes with a large diameter is known as a flange. This piece of hardware, which is also known as a carbon steel flange, typically consists of two sections of flange and a number of bolts used for fastening.

 

Carbon steel flanges are made of carbon steel. The ductility of mild steel is high, but its strength is low. When the appropriate amount of carbon is added, the material will become harder, while the plasticity will cause the strength to decrease. It's possible that flanged connections will need to be able to withstand greater amounts of tensile, compressive, torsional, and shear force. Because of this, butt welding flanges are the option that is recommended.

 

Cautionary measures to take before using butt welding flanges:

 

Cautionary measures to take before using butt welding flanges:.

 

1. The butt current should not be too large; it should be approximately 20% smaller than that of the carbon steel electrode. The arc should not be too long, the cooling of the intermediate layer should be fast, and the welding seam should be narrow. All of these things should be done in order to prevent the intergranular corrosion that is caused by the heating of the butt welding flange. The electrode should be kept dry, the titanium calcium type should be dried at 150°C for 1 hour, and the low hydrogen type should be dried at 200-250°C for 1 hour to prevent the electrode coating from adhering to oil and other dirt and to avoid increasing the weld Carbon content in stainless steel and butt weld flanges, which affects weld quality. This can be accomplished by drying the titanium calcium type at 150°C for 1 hour and the low hydrogen type at 200-250°C.

 

2. Carbide will precipitate during the butt welding process of the butt welding flange. This will have the effect of lowering the material's resistance to corrosion as well as its mechanical properties. The American standard flange is large and prone to cracking after the chrome stainless steel welded flange has been subjected to the hardening process. It is recommended that the same kind of chromium stainless steel electrode be preheated for more than 300 times and slowly cooled for more than 700 times before butt welding it.

 

Spatter from welding, iron filings, grease, and any other external impurities need to be cleaned off the moving area of the probe. The flaw detection cousin ought to have a flat and smooth surface to make it easier to conduct a free scan with the probe. In the event that it is required, the surface roughness should be ground to R. 6. 3m. In the case of welds in which the excess has been removed, the remaining excess must be ground down until it is flush with the base metal that is adjacent to it. Welds that still have some height, such as undercuts, large bulges, and depressions on the surface of the welds, need to be ground properly, and smooth transitions need to be made so that the evaluation of the inspection results is not impacted.

Publicado en Free Packages en octubre 19 at 09:30
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