Hello dear visitors. A long time ago, in those days, when in Russia, the use of the CB radio band had just been allowed, a simple antenna was urgently needed. Naturally, the simplest and not requiring SU (matching devices) is GP. They had pipes from the old Wave Canal and a broken cot.

It was necessary to connect three tubes into a single whole, i.e. receive a 2.7m LENGTH PIN. The inner diameter of the tubes from the clamshell was 2mm larger than the outer diameter of the tubes from the old antenna. This is where the idea came up to use a split pipe, which could have an inner diameter greater than or less than the outer diameter of the connected pipes. In the first case, it is necessary to make a cut in the pipe of such a width that, when the pipe is compressed with clamps, it tightly compresses the connected pipe.

The tubes connected in this way have good electrical contact. The connection is solid. If necessary, the entire system is very quickly disassembled. I hope everything is clear from photos 1 and 2. Photo 1 shows just one of the GP antenna pipes, traces of old clamps are visible. In this way, you can also connect wooden parts.

Support for branches

Using such a connection (see photo 3), you can make collapsible, lightweight props for the branches of fruit trees. The stores sell cuttings for rakes, which have a length of 1.2 ... 1.5 meters, a diameter of 3 to 4 cm.


Using a pair of these cuttings, a pair of worm-drive clamps, and a split aluminum tube of a suitable diameter, you can make an excellent support. Another advantage of such a connection is the ability to tighten the clamps when, for example, the wood of the handle dries out. A couple of turns of the screwdriver - and the connection becomes rigid again. Sometimes the cuttings of shovels break, especially when they are made of birch, and there is no new one at hand, in this case, such a connection can also be used at the break point. It turns out a kind of bandage.

Grass scythe repair

For three years, the scythe at the spit broke in the place where the handle was embedded. Transplanting a scythe is a very serious and painstaking task. Again I remembered the split pipe. I thought temporarily, but it turned out like the Russians. The spigot broke in such a way that I had to shorten it, so instead of a split pipe, I used a pipe with cut ends. Here's what it looks like.

If you are interested in how to connect two aluminum pipes, we will talk about the intricacies of this case and reveal its little tricks. The need for this operation appears quite often in everyday life and sometimes very experienced craftsmen can be confused. As a rule, this task is performed by welding or threading. But there are other ways as well. After all, welding works are not only expensive, they require professional equipment and a specialist and cannot always be performed in the right place. In addition, sometimes pipes need to be connected very quickly, without waiting for the arrival of the welder with the equipment.

Fittings all can

In order to quickly and reliably connect aluminum pipes at home, special fasteners have been created - fittings.

They are divided into two types:

• according to the cross section of the connected elements: straight (two identical diameters) and transitional (two different diameters),
• by purpose: corners and bends, tees, couplings, crosses, fittings, adapters, plugs, caps.

Fittings not only solve the problem of how to connect aluminum pipes without welding, but also simplify the process of installing any communication networks or manufacturing various structures.

The most popular fittings are a crimp type of installation, or rather, press fittings.

Why Compression Fittings Are Recommended:

• pipe joints are completely sealed,
• strength and reliability of the connection,
• vibration resistance.

Types of fittings

Couplings are the most commonly used type of fittings. High-quality couplings with fasteners allow you to quickly and reliably ensure a reliable connection of two or more pipes. It is often used and such a variety of it as the Gebo coupling.

Flanges with rubber gaskets ensure a secure pipe connection. Such elements are preferably chosen with a large cross section.

Also, the question of how to connect an aluminum pipe to each other can be answered by such a device as a repair and installation clip. This is a coupling or triple type of fitting, consisting of 2 parts fastened together. This is a very good way for an express pipe connection - for example, in case of an accident or other emergency.

No less effective and simple is the method of joining pipes using a clamp, which provides a reliable connection. It tightens on one side, which is not like a clip. The connection is therefore considered to be more durable.

How to connect square aluminum pipes

Aluminum pipes of square, rectangular or other sections are usually connected by means of a crab system or clamps.

The crab system is narrow strips of metal from 2 parts interconnected. They look like the letters T, X or G and can reliably cover pipe sections. The resulting joints are highly reliable. But docking occurs only at a right angle and is made for pipes of a small cross section.

A more universal method of joining pipes of a complex profile is a clamp. We offer to pick up and buy an aluminum pipe on our website at competitive prices and in an extensive selection.

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Details about the complex: the connection of metal pipes for water supply, sewerage, metal frames

This article is about how, when installing water pipes and sewers, to connect metal pipes by threading and welding, fittings and chasing sockets. I will not limit myself to plumbing and will touch, albeit in passing, on the method of installing metal frames for shelving, temporary buildings and greenhouses. So, let's go.

Cast iron

At present, cast-iron pipes are used mainly for laying sewers, and even then very limitedly: they have been seriously supplanted by cheaper and lighter PVC and polypropylene products.

Pressure cast-iron pipes are even less popular: they are used for laying water pipes with a small depth in conditions of a significant load on the ground.

Socket connection with embossing

When installing a free-flow sewer, the connection of cast-iron pipes is performed as follows:

The diagram above needs a few comments:

• Instead of a cable (organic fiber impregnated with oil or bitumen), a more durable graphite gland can be used;
• Chasing is easy to make by flattening one end of a steel tube with a diameter of 10 - 12 mm and bending its end into a club;

Personally, I have always used a wide, strong screwdriver for chasing joints. It is less convenient, but takes up less space in the toolbox and is useful for many other plumbing jobs.

• To seal the socket, you can use pure cement, diluted with water to the consistency of very thick sour cream;
• The socket during operation must be rigidly fixed. Otherwise, it will loosen and leak.

Socket connection with rubber ring

This type of connection is typical for ductile iron pipes (ductile iron). Due to the combination of corrosion resistance and plasticity characteristic of steel, the material is in demand, among other things, in the installation of water pipes.

The instruction for assembling the connection is extremely simple: the smooth end of the pipe with the chamfer removed is pressed into the socket with a rubber seal. Since, with large pipe diameters, the assembly of the connection requires a lot of effort, and the mass of the pipes is estimated at tens and hundreds of kilograms, loading equipment is often used for installation.

Previously, pipes made of gray cast iron with sockets for embossing were often used for the installation of water pipes. However, their sealing was carried out not with cement, but with lead.

Steel

Steel has also been supplanted by modern polymers; however, in the heating and hot water systems of apartment buildings, it is still in demand more than alternatives. The reason is simple: the enormous tensile strength of steel pipes allows them to endure water hammer and other force majeure, typical for central heating and heating mains, without the risk of destruction.

Electric welding

The essence of the method is with the transfer of the electrode metal by an electric arc to grounded parts. The edges of the pipes to be welded are melted, and the seam, due to molecular diffusion, becomes one with them. The slag forms a coating on the surface of the weld, which prevents the oxidation of the metal, and is cleaned after cooling.

Here's what the process looks like from the welder's point of view:

1. Both pipes face at right angles to the longitudinal axis. With a large wall thickness, the outer chamfer is removed;

Particularly thick-walled, large-diameter pipes require chamfering both inside and out. They are also welded on both sides.

1. Two tacks are made on opposite sides of the pipes, after which they are aligned along a common axis;
2. The seam is welded along the entire length. To do this, the electrode is brought to the part at an angle to the surface, so as to avoid sticking of the core. To obtain a sealed seam, it is necessary to prevent the metal from seizing in the welding area: a melt pool must be constantly visible under the electrode.

gas welding

What does gas welding of steel pipes look like?

1. The burner is connected by hoses to oxygen (blue) and acetylene (white) cylinders;
2. The torch is ignited and adjusted in such a way that the area of ​​bright blue glow has a length of 1.5 - 2 cm;
3. The edges of the pipe are heated until the edges are melted, after which a welding wire is introduced into the blue area of ​​the torch. Its melt is blown off by a burner onto the seam, gradually filling it. And in this case, it is important not to let the melt bath seize: by melting metal onto a cold pipe, you will not achieve tightness.

It is easier for an amateur to learn how to weld sealed seams with gas. Gas welding forgives mistakes: the seam can always be reheated with a torch and brought to a melting temperature. It took me a few hours for basic training, while your obedient servant did not learn how to hermetically cook with electric welding.

Fixed seams

Both gas and electric arc welding use two identical techniques for welding fixed seams:

1. Mirror. It is placed on the back side of the pipe, after which the seam is welded with mirror reflection control;
2. Window(surgical suture). A U-shaped cut is made in the pipe; part of the pipe is bent; the seam is welded from the inside; then the window is folded back to its original position and sealed.

Threads

How to connect metal pipes on threads?

In general, only two types of threads are used:

1. Short (5 threads) for turning parts;
2. Long, or drive (12 - 15 threads) - for the case when two fixed pipes are connected. In this case, a coupling and a lock nut are sequentially driven from a long thread to a short thread of the attached part.

The tightness of the threaded connection is ensured by winding laid along the thread. In plumbing in this role are used:

The thread is cut:

• With your own hands, using a die or klupp (several individual incisors in a common mandrel);

When cutting threads, remove the outer chamfer, making an entry for the die, and lubricate the pipe with any oil (even a solarium or mining will do).

• On a screw-cutting lathe.

Galvanized pipes are assembled only and exclusively on threads. Welding burns out a layer of zinc in the seam area: steel melts at 1400 degrees, and zinc at 900 already evaporates. As a result, you get pipes without anti-corrosion coating at the price of galvanizing.

Compression fittings

Threadless connection of steel pipes is carried out with a conventional compression fitting with a union nut, a thrust ring and a rubber ring seal. Fittings are very useful on old ones that are dangerous to thread, in the absence of welding and the ability to completely replace old pipes.

The connection setup looks like this:

There are a few nuances, however, here:

1. It is desirable to clean the layers of old paint and rust on the pipe;
2. It does not hurt to remove the outer chamfer on it;
3. Lubricants must not be used when assembling the joint. They will increase the risk of undocking if accidentally jerked.

Frameworks

Frame structures do not require connections and are assembled on the so-called "crabs" - linings that are pulled together with ordinary bolts. "Crabs" are produced for all running sizes of round and shaped pipes. They can be used to assemble not only steel, but also aluminum frames.

The frame of the greenhouse is assembled on "crabs".

stainless steel

Corrugated stainless steel pipe is an excellent alternative to galvanizing, which compares favorably with its ease of installation and flexibility. Tensile strength at a diameter of 15 mm reaches, according to Lavita, 210 atmospheres. Since all stainless pipes on the market have the same wall thickness - 0.3 mm - similar strength indicators can be expected from products from other manufacturers.

Let's go back to connecting pipes with fittings. It is completely identical to the use of a compression fitting for a steel pipe: the end cut in place is inserted into the fitting with the union nut loosened, after which it is tightened. Tools - a pair of adjustable or gas wrenches. The assembled connection is completely sealed and does not require maintenance; it can fit into a strobe or screed.

Manufacturers guarantee an unlimited service life of stainless steel pipes. Fitting seals, however, do not last forever: in 30 years, you or your children will have to attend to the replacement of silicone rings.

Copper

Connection of copper pipes is carried out:

• soldering;
• Compression fittings.

Let's take a look at both methods.

Soldering

The connection requires the following sequence of actions:

1. One of the pipes is flared. The gap between the socket and the smooth pipe should be 0.1 - 0.15 mm. As an option, solder fittings with ready-made sockets are used;

1. The inner surface of the socket and the outer surface of the pipe are sanded with fine emery and covered with flux. When heated, it will clean the copper from oxides and provide reliable adhesion between it and the solder;
2. The pipe is inserted into the fitting;
3. The socket with the pipe inserted into it is heated to a temperature of at least 300C (for low-temperature solders). Usually a gas burner is used for this purpose, however, at the cost of a little more time, you can get by with a building hair dryer: most models from decent manufacturers are able to heat the air up to 550 - 600C;

1. The solder rod is introduced into the burner flame or hot air flow and touches the socket. The solder melt quickly fills the entire gap due to the capillary effect.

Compression fittings

These products, unlike fittings with rubber seals, tolerate heat well: tightness is ensured by soft copper rings.

How to connect copper pipes with fittings? Very simple:

1. A union nut and a sealing ring are successively put on the pipe;
2. The pipe is inserted into the fitting body;
3. The union nut is tightened, compressing the pipe with a copper ring. Due to its plasticity, the metal fills the slightest irregularities and ensures complete tightness of the joint.

Conclusion

I hope that my short review seemed to the reader quite informative. Some additional information can be learned by watching the video in this article. I look forward to your comments and additions.

Good luck, comrades!

If you want to express gratitude, add a clarification or objection, ask the author something - add a comment or say thanks!

Tubes made of aluminum and its alloys are used in various industries due to the combination of unique technological characteristics. There are the following profiles: round, square, rectangular and shaped. One of the common types of tubular products is round aluminum tubes with a diameter of 6–10 mm. Manufactured according to various technologies and various GOSTs, they differ in their properties and areas of application.

Pipe production

Aluminum tubes, depending on the production method, are:

• cold-formed;
• welded straight seam;
• pressed.

Cold formed aluminum

Cold-formed aluminum tubes with a diameter of 6 to 150 mm are produced in accordance with GOST 18475-82. Their purpose is general purpose. The main characteristic of these products, in addition to geometric ones, is the brand of aluminum (or alloy) and the state of the material, which, depending on the heat treatment, can be

• annealed
• cold-worked,
• hardened
• aged.

Supplied in cuts and coils. Seamless cold-formed tubes from some grades of aluminum and its alloys are produced according to OST 1 92096-83. Their purpose is special branches of engineering.

Longitudinally welded pipes

Aluminum tubes with a diameter of 10 to 220 mm, made by continuous HFC welding from a tape, are called straight-seam welded and must comply with GOST GOST 23697-79. The material condition of these pipes is

• cold-worked,
• tempered + aged.

Pipes made from annealed tape are not subjected to additional heat treatment. The type of heat treatment of pipe products depends on the material of the tape. The batch marking includes data on the state of the material and the grade of the alloy.

Extruded aluminum pipes

Pressed aluminum tubes with a diameter of 18 to 300 mm are produced in accordance with GOST 18482-79. According to this standard, thin-walled (up to 5 mm) and thick-walled products produced by pressing through a press washer are distinguished. According to the condition of the tube material, there may be

• annealed
• hardened + aged.

In the manufacture of pipe products by hot pressing, it is allowed not to perform heat treatment. The purpose of the products is general industrial.

Aluminum tubes 4 mm and 5 mm, which appear on sale, are all imported. According to GOST, pipe products of such diameters are not produced.

Specifications and application

The use of aluminum tubes is associated with the technical characteristics that this metal possesses.

VHF antenna from a tube

1. Resistant to corrosion in air. An oxide film is formed on the surface of the metal, which does not allow oxygen to penetrate and prevents oxidation.
2. Stability in aggressive environments.
3. Low density (3 times lighter than steel, 3.3 times lighter than copper).
4. High thermal conductivity (4 times higher than steel, but almost 2 times lower than copper).

Due to these properties, aluminum tubes of small diameters are successfully used in the following industries:

• aviation industry;
• space technologies;
• mechanical engineering;
• automotive industry;
• chemical production;
• processing of oil products;
• furniture industry;
• production of electrical, cryogenic, heat exchange and climatic equipment;
• production of sports equipment, greenhouses and household goods.

From aluminum pipes with diameters of 4, 5, 6, 7, 8 mm, home craftsmen make radio-controlled aircraft, aircraft models, and television and radio antennas. Corrugated flexible tubes are used as air ducts, and telescopic tubes are used in equipment that needs parts of variable length.

Working with aluminum tubes

Appliance repairs, car tuning, or technical creativity may require joining, soldering, or bending aluminum tubing.

How to connect two aluminum tubes

Two aluminum tubes can be soldered together. To do this, you need a gas burner, solder and flux. Some solders do not require the use of fluxes. Imported manufacturers of solders and fluxes on the market: Castolin, France; Chemet, Germany; Harris (USA); La-Co, USA; Rexant, China. Domestic manufacturers produce products according to TU 48-0220-62-94.

For different solders and fluxes, the algorithm may be slightly different, but the general order is as follows:

1. Thoroughly clean the surface
2. Apply flux (if required) to the edges of both tubes.
3. Heat the soldering point to the required temperature (depending on the flux and solder). You can determine the required temperature visually by melting solder and bubbling flux.

Attention! Do not point the flame of the burner at the flux!

1. Connect the joints by soldering the seam.
2. Cool and clean the surface of flux residues.

In the same way, you can act when the question arises: how to solder an aluminum tube.

How to bend aluminum tube

For bending tubes of small diameters (up to 20 mm), the workpiece is not preheated, and the process itself is most often carried out using:

• manual pipe bender by hauling;
• internal spring for bending.

In the latter case, a special spring is inserted into the tube to the place of the bend. The pipe is manually bent to the desired angle and the spring supporting the pipe walls during the process is removed.

Pipe bending springs - internal and external

Choosing the right type of aluminum tubes and properly working with them, you can be sure of long-term and trouble-free operation.

Video: Solder Aluminum - 13 UF for aluminum brazing