Can the flange of welded steel pipe and cast iron pipe be connected?

1. Welded steel pipes.

And cast iron pipe with flange can not be connected, yes.

2. Weld the steel pipe with a carbon steel flange (with a carbon steel welding rod).

3. Cast iron pipes are welded with cast iron flanges (cast iron electrodes are preferably cast 308).

4. There is no problem with the reconnection of the two pipes.

It is possible to have a carbon steel flange on one side and a cast iron flange on the other.

Cast iron pipes. It can be welded with steel pipes, such as wewelding777 cast iron electrodes, which are mostly used in ductile iron at construction sites and installation sites.

The dissimilar welding application of pipe and carbon steel elbow welding, this is also a feature of this electrode, and the belt is used for dissimilar welding of cast iron and carbon steel, including dissimilar welding between cast iron and stainless steel, and welding tensile strength.

485mpa。

1. WeWelding 777 electrode application:

1. AWS SFA standard, produced by R&D Industries, a manufacturer of special maintenance welding consumables in the United States.

2. It is suitable for all kinds of cast iron (including ductile iron, gray iron, high CR maintenance welding), as well as dissimilar welding of cast iron and steel.

3. It is used for low-pressure water welding of cast iron pipes.

4. Alloy metal welding core design, coated with unique flux, with anti-cracking function.

5. The weld deposition layer can be machined.

2. Wewelding777 (What are they used for?)

Welded cast iron and steel, welded with different cast irons Transmission gearbox.

Grey cast iron, malleable cast iron or ductile iron sewer pipes.

3. Technical parameters of wewelding777.

Tensile Strength: 70,000 psi ( 482 Newtons.

Stupid shed He square millimeters).

Yield strength. Generally 62,000 (427 Newtons square mm).

Hardness (HB): 185HB Color matching with base metal: similar.

Power selection: AC and DC dual-purpose, DC reverse connection when DC.

Fourth, process parameters.

Diameter (mm).

Current (amps.

Package Weight (lbs) 2 2 2

Dear, I am glad to answer for you: Can the pipe fittings be directly connected to the flange? A:

Hello: Yes, there are standard flanges, according to different pressure levels, different specifications of flanges, there are clear bolt numbers and bolt sizes, bolt holes also have standard sizes. If the outer diameter is not much different, the middle diameter and the hole diameter of the bolt hole can be unified, and the connection can be made.

If the specifications are too different to be connected directly, the reducer can be used as an overhead. Flange, also known as flange disc or flange. A flange is a part that connects between pipes and pipes, and is used for the connection between pipe ends; There are also flanges used on the inlet and outlet of the equipment, which are used for the connection between two equipment, such as the reducer flange.

Flange connection or flange joint refers to the detachable connection of flanges, gaskets and bolts connected to each other as a set of combined sealing structures. Pipe flange refers to the flange used for piping in piping installation, and used in equipment refers to the inlet and outlet flange of equipment. There are holes in the flanges, and the bolts make the two flanges close together.

The flanges are sealed with gaskets. Flange sub-threaded connection (threaded connection) flange, welded flange and clip flange. The flanges are used in pairs, and the wire flange can be used for low-pressure pipes, and the welded flange is used for pressures above four kilograms.

A gasket is added between the two flanges and then bolted. The flange thickness is different for different pressures, and the bolts they use are also different. When the pump and valve are connected to the pipeline, the parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections.

All the connecting parts that are bolted around the periphery of the two planes and closed at the same time are generally called "flanges", such as the connection of ventilation ducts, this kind of parts can be called "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the pump, so it is not good to call the pump "flange parts". Relatively small ones, such as valves, can be called "flange parts".

I hope my reply can help you, if you have any follow-up questions, please feel free to ask, I will reply to you as soon as possible. <>

1.Flange connectionWhere the pipe section is connected with the pipe section with a flange or the pipe section is connected with the flange valve, the standard flange must be selected according to the design requirements and working pressure. The diameter and length of the connecting bolts of the flange should meet the requirements of the specification, and the flange bolts should be tightened symmetrically, and the exposed thread buckle of the fastened bolt should be 2-3 buckles, which should not be greater than half of the bolt diameter.

The flange is connected to the liner, and the rubber pad with a thickness of 3mm is generally used for water supply (cold water), and the asbestos rubber pad with a thickness of 3mm should be used for heating and domestic hot water pipes. The gasket should be concentric with the pipe diameter and should not be deviated. 2.

According to the design requirements, the steam pipeline with working pressure above the working pressure, the heating pipeline with a general pipe diameter of more than 32mm and the fire pipe of high-rise buildings can be connected by electric and gas welding. When the pipeline is welded, there should be windproof, rainproof and snowproof measures, the ambient temperature of the welding area is lower than -20, the weld should be preheated, the preheating temperature is 100-200, and the preheating length is 200-250mm. Generally, pipeline welding is in the form of counterpart and assembly.

No.

General Principles for Petrochemical Pipeline Layout Design SH 3012-2000 Flat Welded Flange should not be directly connected with elbows without straight pipe sections.

This standard also has provisions: "Code for Construction of Field Equipment and Industrial Pipeline Welding Engineering" GB50236-2011:

The weld shall not be set in the stress concentration area, shall be convenient for welding and heat treatment, and shall comply with the following provisions:

2. The distance between the center of the pipe and the two butt welds on the straight pipe section shall comply with the following provisions:

1) When the nominal size is greater than or equal to 150mm, it should not be less than 150mm;

2) When the nominal size is less than 150mm, it should not be smaller than the outer diameter of the tube, and should not be less than 100mm.

A: A welded flange is a device that connects two sections of pipe together with bolts. Unlike a flat flange, a flat flange, as the name suggests, is a flat steel flange that can be welded to a pipe, and the welded flange has a tapered conical device on the pipe side of the flange.

This taper starts wide from the flange and then gradually decreases for hot and cold high-pressure pipes, the taper in the welded flange reduces turbulence at the pipe joint and increases the strength to withstand the constant bending of the joint caused by temperature and pressure changes. For hot and cold high-pressure pipes, the taper in the welded flange reduces turbulence at the pipe joint and increases strength. The most common weld used to attach a weld flange to a pipe is known as a butt weld or weld flange weld.

To accomplish this weld, the welder uses a grinder to create a taper at the end of the pipe and the tapered end on the weld flange. When the two taper are placed together, the two taper form a V-shape, which then fills the weld. This type of weld provides maximum penetration to pipes and flanges, and therefore gives the joint or connector maximum strength.

The welded flange is the part where the pipe is connected to each other and is connected to the end of the pipe. There are holes on the welded flange, and the bolts make the two flanges tightly connected. Sealed with intermittent gaskets. A welded flange is a disc-shaped part that is most commonly found in plumbing.

Can be welded.

However, the welding of carbon steel and stainless steel belongs to dissimilar steel welding. Considering that the metallographic structure of the base metal on both sides of the weld is different, in the process of welding metallurgy, it is necessary to pay attention to the selection of welding process, especially the selection of welding consumables.

It is common practice to determine the area of carbon steel and stainless steel base metal according to the Schaeffler phase diagram, and then estimate the metallographic structure of the selected welding consumables and welds according to the deposition ratio in the form of grooves. Generally speaking, the austenite microstructure has good properties, and the martensitic microstructure has coarse grains and high strength, but the toughness is poor and it is easy to crack. The welding consumables and welding process should be selected so that the weld structure falls in the austenitic area.

If it is the welding of ordinary carbon steel and austenitic stainless steel, the welding consumables of austenitic stainless steel can be selected. Verification is required for any welding process. Only the welding process that has passed the test is the right choice to meet the technical requirements.

Hope it helps.

Yes, as long as the welder's skills are okay, there is not much of a problem; However, it is not economical to weld stainless steel flanges for carbon steel pipes, and if your pipes are to be pressurized, it is better to use pipes and flanges of the same material for welding.

It can be guaranteed, stainless steel is generally 304, and the strength is not high, so the use of J422 can meet the strength requirements.

If you ensure that the weld is free of excessive defects, there is no problem.

It can be welded, but the appropriate electrode should be selected according to the material of the joint on both sides, otherwise the joint will be easily damaged due to the different expansion coefficients on both sides.

Flange welding: The welded flange is the part that connects the pipe with the pipe and is connected to the end of the pipe; There are also flanges used on the inlet and outlet of the equipment, which are used for the connection between two equipment, such as the reducer flange. Flange connection or flange joint refers to the detachable connection of flanges, gaskets and bolts connected to each other as a set of combined sealing structures, pipeline flanges refer to the flanges used for piping in pipeline installations, and use in equipment refers to the inlet and outlet flanges of equipment.

In HG, the standards for butt weld flanges, flat weld flanges, and socket weld 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.

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