Finishing 

Types and methods of production of aluminum tubes for use in various industries. Practical and simple pipe connection without threading and welding How to connect aluminum pipes without welding

To learn how to connect metal pipes without welding, it is necessary to study in detail the methods of connecting these pipe materials. The thing is that pipelines are a complex structure from a series connection of a pipe-rolling assortment, measuring equipment, which are provided for in the project.

Matching can be done in a variety of ways. When choosing optimal solution focus on the purpose of the highway and the conditions for its use. Also take into account the diameter of the pipe assortment.

When laying the highway, the connection method may be different. Some of them may be one-piece, but dismantling with subsequent reassembly of the structure is possible.

And there are monolithic joints that cannot be disassembled without destroying the structure. Welding has won the greatest popularity among monolithic joints. But, this is far from the only method that allows you to connect sections of the pipeline, there are others.

Despite the high popularity of plastic, steel products are still used. Welded fastening is used very often, but such a joint is impossible without special knowledge and skills. Therefore, many try to use options that allow you to connect in a different way.

Mounting with threaded connection

About how to connect iron pipes without welding, we will discuss further, but in this article you can find out. To make docking, this method is very common.

The threaded connection can be located in such places of the main line, where the conditions allow for constant control of the joint. Moreover, it should be possible to repair work if necessary.

Most often, threads are rolled on special equipment, but such work can be done independently.

It is performed in the following sequence:


How to connect without threading and welding

Next, you can learn how to connect metal pipes without welding and threading. Speaking of connecting metal pipes, this method cannot be bypassed, because it is very popular during installation work.

Installation work is carried out in the following sequence:

  1. Metal pipes prepared for fastening are cut off at the end parts. The cut on them should be done perpendicularly and make sure that it runs smoothly.
  2. A coupling is applied to the connection area. The center of the connecting element must be located exactly in the pipe joint area.
  3. Markings are made on the pipes with a marker, it will indicate the position of the fitting.
  4. Silicone grease covers the end parts of the connection.
  5. One pipe is inserted into the connecting piece according to the mark indicator. After that, the second is put in the same axial line with the first, and only after that it is attached with a coupling. When dressing, the mark affixed with a marker will be a guideline.

Watch the video

Metal gas connection

  • The correctness of the connection is checked as follows. A soapy solution is applied to the joint area. When soap bubbles appear on the surface, it is advised to stretch the joint more strongly.

Docking silencer pipes without welding

If a common problem has come with a rotten muffler flange, then you should think about how to connect the muffler pipes without welding. The whole point is this. In this situation, there are several options.

The first option is to cook. The next option is to buy a new muffler. The third option is to look for alternative exits. In both cases, you have to pay big money. If there is no strong rust on the muffler, then you can use a clamp.

As practice has shown, such clamps have long been used by world-famous car companies such as Volkswagen and Audi. And it should be noted that these devices in many cases have successfully replaced welding in car repairs.


To connect pipes at an angle and for a branch, other types of fittings are installed: elbows, transitional and others. The end parts of the parts for the joint must be cleaned, and the thread must be made with a high degree of accuracy.

To increase the strength of the joint of these products, it is wound with a strand of flax, only the thread is covered with white before that.

The short threaded part is characterized by such features. In the area of ​​the two turns at the end, which are called thread runouts, the depth is usually shorter. This makes it possible to provide a more durable joint without welding, without using runaways and seals.


Two parts on the elongated threaded part can be fastened together without welding by means of a drive. On the first part of it is a short thread, and on the other - a large one. The short one is designed for fastening with a coupling. A coupling with a lock nut is put on an elongated thread. A large thread allows you to adjust the length of the workpiece.

Drives are most often used in the repair of a section of the highway that has become unusable. The docking element and the locknut are driven onto a large thread.

To mount the squeegee, a sealing thread is used. It is screwed to the end of a short threaded thread on a metal product.

Sometimes, when installing the drive, a bundle of FUM tape is laid between the locknut and the coupling. It is laid in three layers. Such a joint is performed as follows:

  1. A coupling and a lock nut are screwed onto a large threaded thread.
  2. At the same time, they also take a sealing thread. It is wound on the end of the coupling, which is tightly fitted with a lock nut.
  3. The tourniquet must lie in a chamfer, only in this way neither liquid nor steam can leak out.

Speaking about how to connect two metal pipes without welding, it is worth dwelling separately on such an option as Gebo. In parts of the highway where the connection is in a hard-to-reach area, this method is quite effective.

The name Gebo was given to a special fitting. It is put with the sole purpose of connecting several pipes. All work can be done quickly and easily. Thread cutting is not required.

There is an erroneous opinion that it is dangerous to join a riser with such a part without welding. But, properly mounted, this element can withstand very heavy loads. It should also be added here that such a mechanism is highly resistant to the influence of axial forces.


While maintaining standards temperature regime such a detail perfectly holds not only metal products, but also plastic ones.

Using the material outlined above it is clear how to join metal pipes without welding. Almost all of the proposed methods are suitable for inexperienced craftsmen, and allow you to connect products without expensive welding, which requires high qualifications and special equipment.

Soldering aluminum at home, technologies, methods

1. The simplest and in a reliable way, connect something or attach to aluminum or its alloys - this, of course, is a bolt and nut or rivet. All other methods require some training, fixtures, special solders, aluminum soldering fluxes, etc.

As practice shows, aluminum is not soldered at all in the usual way, with tin-lead solder, the reason for this is an oxide film, which forms almost instantly after cleaning the surface to be soldered.

2. Therefore, one of the ways to solder aluminum is - coating the surface, immediately after stripping, with a layer of molten rosin. Not the best, but after repeated attempts, rubbing the soldering point with a soldering iron tip, you can achieve satisfactory results.

3. Further, a solution of rosin in diethyl ether can be used to solder aluminum. We clean the surface and immediately lubricate it with such a flux, and then sprinkle it with copper filings, which serve as an abrasive to remove the oxide film, and tin the soldering place with ordinary solder (tin-lead). After, solder to the tinned area copper wire or something else.

4. The next aluminum soldering technology is the use of special solder for aluminum soldering and flux. Most of these solders are low-temperature, but their melting point is higher than that of tin-lead, within 300-600 g. C. The key to success is also a good warm-up and for this they use a gas burner or a blowtorch.

High-temperature solders are used for soldering massive parts, they are used to repair and restore parts made of aluminum and its alloys of any complexity (cars, motorcycles, etc.). The soldering is very strong. In this way, tubes are soldered, for example, aluminum and copper, inserting one into the other and soldering around. But, when soldering aluminum with other metals, make sure that the solder and flux are designed for one and the other metal.

The surface is cleaned and covered with a special flux, as in previous cases, and when the solder melts, you can scrape the place of the solder with the tip of a stainless steel knife (or stainless steel brush) to better remove the oxide film. Thus, we tin the aluminum surface and solder everything we need to it.

This does not end the ways of soldering aluminum at home. You can apply the electrochemical method.

5. We clean the surface and apply a few drops of CONCENTRATED solution of copper sulphate to the place of soldering. Then, we take a power supply for 5-12V and a current of about 1 ampere (or more), we connect a resistance of 4-5 ohms and powerful to the power supply. 5-10 W, and our device is ready. We calculate the load in such a way that the PSU does not burn out during operation, i.e., approximately at a current of 1-5 Amperes.

Now we connect the aluminum blank to the negative pole of the power supply, and to the positive we attach a bare copper wire (you can twist it into a small flat spiral), which is then introduced into a drop of vitriol solution so that the end does not touch the surface of the part. Everything is ready, turn on the power supply and wait a few minutes. A layer of copper, as a result of electrolysis, will settle on the place for soldering. And then, wash off (but do not try to erase the copper), tin, and solder the wires or terminal. This method, of course, is not suitable for soldering some massive parts, but it is suitable for contact with wires.

6. Alternatively, instead of a solution of vitriol, you can use hydrochloric acid: drip into the soldering place and then drive the copper drive over the contact pad. Copper precipitation occurs faster than in the first case, but one must be careful with acid. And be sure to thoroughly rinse the place of soldering with water.

Connecting copper pipes: instructions and comparison of various installation technologies

So that the acid does not corrode the excess area, it can be sealed with tape or filled with paraffin, and the desired area should be exposed. That. you can solder aluminum with copper and other metals, and the contact pads will have a beautiful, neat shape.

That's all, and if there are any other ways to solder aluminum or additions to the above, write.

Viktor Donskoy
www.masteru.org.ua

Photo of a beautiful girl to attract your attention

Welding aluminum is not an easy task

High electrical and thermal conductivity of aluminum, very low weight, combined with excellent mechanical properties of its alloys, made this material simply indispensable in many areas of production. But with all their unique properties This metal is very difficult to weld. The ability to weld aluminum with high quality is what distinguishes a highly qualified welder from an amateur welder.

There are two main ways of welding aluminum parts:

  • MIG aluminum welding semi-automatic
  • TIG welding of aluminum

Sometimes it becomes necessary to connect aluminum parts to each other, but at the same time there is no suitable welding machine or a professional welder at hand, and the strength of the connection does not play a special role. In that case, on help will come method which is described in our video instruction.

You will need:

  • propane burner
  • Aluminum Brazing Rods
  • Surface degreaser
  • Clamps for holding parts together

"Welding" aluminum without using a welding machine

Attention

In fact, it is certainly not welding. This method, perhaps, can be called soldering. Despite this, this method is quite suitable in the case when the parts to be connected will not experience strong loads, and not strong ones either. For example, for the manufacture of decorative products, souvenirs.

So, if you need to weld aluminum parts, use the services of professionals. Or buy welding machine and become a pro yourself. Good luck!

Aluminum pipe due to its qualities is quite common building material. It can be used in the construction of various pipelines, drainage and ventilation systems, as well as for the manufacture various designs. How to choose the right pipes, dock and lay pipes, read on.

Areas of use of aluminum pipes

Pipes made of aluminum have the following positive qualities:

  • resistance to corrosion. This factor significantly increases the area of ​​​​use of pipes and their service life;
  • low weight, which is reflected in the ease of delivery of pipes and their installation;
  • resistance to chemicals and aggressive environments. Due to this factor, pipes can be used for laying underground pipelines;
  • high permeability. Due to the smooth inner surface, aluminum pipes can pass more liquid than pipes made of other materials of the same diameter;
  • possibility of processing. Pipes can be painted, sewn up with any materials, mounted in a wall, and so on. Any method will not negative impact and will not reduce their lifespan.

All qualities presented refer to pipes consisting of 95% aluminum or more.

The positive characteristics of aluminum products determine the scope of their application. Pipes made of this metal can be used:

  • for construction, water disposal, heating, ventilation, both for domestic and industrial purposes;
  • for the construction of drainage systems;
  • for the construction of a storm sewer network;
  • for laying pipelines in the oil and gas industry;
  • for electrical cable insulation;
  • for the construction of building frames;
  • for the construction of gazebos, benches, greenhouses and other small architectural forms.

Main selection criteria

When choosing aluminum pipes for the construction of an object, one should take into account such aspects as:

  • pipe manufacturing method;
  • diameter, shape and other dimensions.

Pipe manufacturing methods

AT modern production The following manufacturing methods for aluminum pipes are used:

  • cold deformation. A pipe with specified parameters is made from an aluminum circle by drawing and subsequent calibration. This method makes it possible to produce pipes with exact dimensions, including those with a minimum diameter and high quality. The main disadvantage is the high cost;

  • pressing. Heated aluminum blanks are passed through a special press with specified parameters. Pressed pipes are different increased resistance to mechanical impact;

  • welding. An aluminum billet with given dimensions is bent into a tube shape. The ends of the workpiece are welded together. Welded pipes are most prone to cracking under high pressure or mechanical stress. Therefore, it is recommended to use them exclusively for domestic purposes and in areas of reach for inspection and repair work.

Selection of basic parameters

Aluminum pipes can be round, square, rectangular:

  • round and oval pipes are mainly used in the construction of pipelines and ventilation systems;
  • square and rectangular (profile) pipes are used for cable laying, construction of building frames, construction of various structures.

Before constructing any structure, you should also take into account such parameters as:

  • pipe diameter used. This parameter is of particular importance during construction, water supply, and so on, since the throughput of the system depends on the diameter;
  • wall thickness of aluminum pipe. The size of the maximum load depends on this parameter, which is of fundamental importance when laying pipelines underground or building various structures.

Each type of pipe is manufactured in accordance with GOST, which also regulates the standard dimensions of products. So:

  • cold-formed aluminum pipes must comply with GOST 18475 - 82;
  • pressed pipes are manufactured in accordance with GOST 18482 - 79;
  • welded pipe complies with GOST 23697 - 79.

GOST also regulates methods for checking and testing pipes, which guarantees the high quality of products.

Methods for connecting aluminum pipes

Before constructing any pipelines or other types of structures, you should familiarize yourself with possible ways aluminum pipe connections.

The main method of connection in the construction of pipelines is welding, which is performed according to the following scheme:

  1. pipes are prepared for welding: cutting, stripping, and so on;
  2. device preparation. Aluminum pipes can be welded using gas burner(argon welding) or conventional welding equipment (electric arc welding). In the latter case, it is necessary to purchase special electrodes;
  3. joining pipes and applying a welded seam.

The video shows the welding process in more detail.

The profile pipe used in the construction of frames and other forms, in addition to welding, can be connected with bolts. For this you need:

  1. cut pipes in accordance with the dimensions specified by the scheme of the future design;
  2. process the edges of the pipes with sandpaper;
  3. drill holes for installing bolts;
  4. assemble the structure using connecting plates.

When installing various structures, you can use other methods, for example, arranging a connection with a threaded fitting, but all similar methods are labor intensive and can lead to a violation of the sealing of the system.

To connect the tubes of air conditioners in apartments or offices, rolling is most often used. This method is simple, affordable and safe for equipment. But sometimes it is necessary to solder the air conditioner tubes.

If you have basic technical knowledge, you can replace or solder the copper pipe in the air conditioner yourself. Pipes are not included with the device - they are bought at hardware stores. A copper pipe with silver impurities is suitable, capable of withstanding temperature changes that occur during operation climate systems and non-corrosive. Pipe materials withstand high pressure and do not deform. Chemical composition allows you to save the surface layer for a long time, which allows the system to work without the need for repair.

Materials and equipment

Copper-phosphorus solders

The diameter of the pipe is selected based on the power of the device - the more powerful, the larger the diameter. The cost of a pipe is affected by its specifications, manufacturer's brand, metal characteristics. You should not save on pipes, as the service life and quality of the split system depends on it.

Soldering air conditioner pipes begins with the selection necessary tools and materials:

  1. Pipe cutter. This tool will allow you to well prepare the end of the part, which will be connected with solder.
  2. Pipe bender. To avoid creases and poor patency, you need to use a special tool so that the diameter does not change, and at the same time the pipe can be bent at an angle.
  3. Metal soldering iron, gas burner.
  4. Solder for soldering copper pipes conditioner.

For the strength and tightness of soldering greater value renders surfaces clean. But the type of solder must be chosen correctly. Soldering is carried out with hard or soft solder.

The pipe bender avoids creases while maintaining the diameter of the pipe

Solders are divided into:

  • copper-phosphorus;
  • silver.

To solder the aluminum tube of the air conditioner, two types of solder are used at once. For copper tubes it is better to choose solder with silver ions than phosphorus. This is due to the brittleness of the phosphorus substance if the alloy contains more than 10% nickel.

If cadmium is included in the solid solder, you need to take care of your health, as the vapors poison the body.

For a high-quality connection of the tubes, a combustible mixture is selected. Check when turned on:

  1. If the torch is of medium size and uniform blue color, this means that the gas-oxygen mixture is well balanced in composition. The metal will heat up evenly.
  2. The pale blue color of the torch indicates that there is more oxygen in the mixture. This will oxidize the metal, and a dark coating will appear on it.

When expanding the outer tube, observe the necessary gap into which the solder will flow. In the absence of such, the connection of the tubes will not be airtight, and freon will flow out under pressure in a matter of minutes.

How copper tubes are soldered - process and rules

Before connecting the air conditioner tube, it is necessary to clean it with emery or a metal brush. Residues of grease, earth, paint impair the adhesion of solder and metal.

Soldering of air conditioner tubes is carried out with a gas burner flame. With an optimal gas mixture, the flame simultaneously cleans and heats the surfaces of the tubes, preparing them for connection.

To connect the tubes of the air conditioner by soldering, it is necessary to insert one tube into another for a length equal to or greater than the diameter of the tubes. The gap is from 0.025 cm to 0.125 cm.

The tubes are heated with a burner evenly. In order for the solder to penetrate the gap, the temperature of the inside and outside must be the same. In this case, not only the place of the proposed welding is captured, but also a little further - 7 centimeters in each direction.

The heated solder rod is dipped into a flux, a thin layer of which protects it from oxide. The smaller the flux layer, the better soldering is obtained.

After it turned out to solder the air conditioner tubes, the flux residues are cleaned off.

Conditions that are observed during work:

  1. The burner must have a flame reduction function to control the heating process. The overheated tube is deformed and the end has to be sawn off.
  2. Flaring is carried out on the pipe that lies towards the going freon, so that there is no friction and resistance at the place of soldering. For example: if freon goes to the left, then expand right side tubes and vice versa.
  3. Since some solders emit harmful gases during heating, ventilation or a respirator should be provided.

Brazing

The low-temperature mode of joining two metal parts involves heating the main parts below 427 degrees, that is, below the melting point of the base metal. With this method, the metal oxidizes less, and local heating can be achieved. Saves energy and materials. The result is a neat, precise seam.

Features of brazing

High-temperature soldering is not used for the freon route

The melting temperature during high-temperature soldering is above 427 degrees, but below the melting temperature of the parts to be joined. The technology is different from low-temperature. Vacuum soldering uses soft tin solder. High-temperature technologies are used for joints that will later work with high temperatures.

For independent performance of work, a low-temperature regime is sufficient. The pipes are not expected to have high freon temperatures, but the connection must be made tightly to avoid refrigerant leakage during operation.

Air conditioner pipe welding

The method of argon welding of air conditioner tubes is used when aluminum tubes are worn or deformed. Argon welding is used because heated aluminum is covered with an oxide film when interacting with oxygen. Argon prevents contact with oxygen and film formation.

The tube welding method is good for repairing auto air conditioners.