"Cold welding" of aluminum: pricing, application, reviews

Aluminum-lightweight metal used in industry for many decades. During this period of time it was found that cold welding of aluminium and its alloys-the only method of joining the workpieces.

What is a cold welding?

The Cold welding method of joining parts made of metal, which is produced without heating under pressure. Bonding is carried out by plastic deformation of the mass and its penetration in the welding surfaces. Cold welding of aluminium is widely available and does not require special training and sophisticated equipment. The process takes place directly in the room, at room temperature. You don't need any heat sources used with arc welding.

Structure and features

Cold welding, in fact, is the glue for metals, and can be one-component or two-component composition, which includes:

• Epoxy resin forming the basis of welding and is responsible for the homogeneity and the plasticity of the composition.
• Metallic component as filler.
• Additional substances and additives improving adhesion, resistance to aggressive environment, temperature characteristics and so on.

The Strength depends on its composition, the proper use and quality of surface preparation.

Under the right conditions the connection is even stronger than the joined metal, but as shown, the seam after the glue less durable than traditional welding. Because it is only recommended for small repairs.

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Glue "Cold welding of aluminum" is found in virtually every hardware store – a huge number of foreign and domestic manufacturers produce this composition, differing only external decoration.

Mastic is usually sold in the form of a double-layer bar, which resembles plasticine, or for convenience, is placed in a cylindrical package.

Before the welding work piece from the cut (perpendicular to) the right amount. Elements of welding after kneading fingers quickly applied to the desired area.

The Principle of welding deformation

Bonding aluminum surfaces produced by plastic deformation.

Connect objects in cold welding very close to each other are pressed, resulting in the destruction of the outer layer, there is a molecular bond, forming a strong connection.

To ensure the best appearance of detail when it is desirable to degrease, to clean the dust.

Methods of cold welding

Connection Technology of aluminum cold process can be divided into 3 methods:

• Butt;
• Point;
• Suture.

Flash welding

In this method, the aluminum workpiece is placed and clamped in a special sponge. Next they served a force which is directed along the axis. As a result, the details of the most tightly closer, and plastic deformation occurs.

This method has some disadvantages:

• Connect the long part is almost impossible, because their size is limited by the design of the clamping device;
• Part of the preparations located in the sleeve-clamping, deformation;
• Difficult to remove from the clips details.

Spot welding

This method is used for welding aluminum workpieces overlap. Use special punches. The location of the pressed punch is called the weld point. The spots feature the line connections after a certain interval.

The Advantage of this method is that no pre-fixing of parts and low deformation of the metal in the United. This is the most common cold welding for aluminum. It can be performed without clamping or on fixed parts.

Seam welding

For the formation of a continuous weld in this welding technique can be used rollers, between which a joined blanks or circle punches.

The welding can be performed either with one rotating roller, which presses the aluminum parts to the support, or two rotating rollers which clamp the parts together.

Depending on the details section of the roller the seam can be done on milling or manual bench top table saw.

When this method of connection the seam is without flanging, however, the lack of it – thinning of the cross section of the parts in the seam, which leads to kink and twist the work pieces in place.

To Reduce this disadvantage by increasing the diameter of the working surface of the rollers. Or the use of this method should be avoided.

Technology welding aluminum

Welding shift – a method of cold welding aluminum. Is performed by way of compression with the tangential offset. As a result of this process come offall of the oxide film, forming bridges of connection. This method is used in industrial environments to connect the wiring and trolley wires, hulls, radios, cable jackets, different frames for household appliances. An excellent result is obtained when welding aluminium, its alloys (subject to cleanliness of billets). In the event of the slightest contamination to achieve a good quality of connection is almost impossible.

To get a good quality connection, it should be sedimentary to apply pressure so that the metal can freely flow on both sides of the weld. Only this condition will allow to achieve a correct displacement of the parts relative to each other.

The Seam on sheet aluminum you can run:

• Straight;
• Circular;
• Continuous (any length).

Usage and features

Before working, clean the surface with rotating steel brushes. Welding aluminium can be produced with different metal. Quite often used welding of aluminum pipes. In the laboratory failed attempt to weld using stamps of aluminium and steel.

For cold welding observed a great future. Despite the fact that we developed new methods for the use of high frequency current, such installations are quite expensive and their efficiency is still quite low.

Welding and brazing can be performed under the influence of the induced currents. When welding DC aluminum can act in the following way: the alkaline solution to lower the two rods, then skip DC. This will result in quick warming up of the minus terminal. Now remove the rods and make a Deposit.

This method is used in laboratories. In the industry its place he found.

When is the cold welding for aluminum, external heating of parts there. This allows you to connect to insulation and electrical wires, to work in a flammable area, to plug holes in containers that cannot be heated. It's also possible the bonding of aluminum to steel. When using cold welding with aluminum can reduce the waste of metal almost in 10 times. Using equipment for welding of aluminium, together connect copper and titanium and other metals and alloys having malleability. For welding aluminum is not always necessary fluxes.

Spot welding to join sheet metal with thickness up to 15 mm.

Butt method connect bars with section up to 30 mm and wire of the same diameter. Cold welding for aluminum high temperature is able to join strips of copper cross-section 100 x 10 mm very durable seam.

Seam welding on the sheet material is completely sealed seam of any length

Aluminum welding by cold method is designed for stationary conditions. The equipment may have a mechanism of precipitation, the hydraulic drive mechanism of the clamping parts.

The cold welding for domestic use include fillers, epoxy, sulphur additives. The polymer composition has a bonding property that appears a little heat. It can be obtained by kneading a piece of matter in his hands for several minutes. Then the mass can be applied to the connection details.

This type of welding is used when performing small repairs of appliances, plumbing, pipes, radiators, Windows, silencers, fuel tanks, etc.

The Mass after drying is able to take if to process it in any form. Complete solidification occurs within 1-8 hours. The details then can be painted.

The Cold welding for aluminum, used it repeatedly, got the most positive. After analyzing them, it can be concluded that the durability and quality of connection, as a rule, entirely dependent on the selected adhesive composition and correct execution of technology.

Cold welding of aluminium in St. Petersburg is carried out in specialized workshops, and independently at home. Packaging material costs from 38 to 40 rubles.

Best cold welding of aluminium

It is specially designed to repair units and parts of the car aluminium, silumin and duralumin.

Quick-setting cold weld "Polirem-Aluminum" a formula which was specially developed for better adhesion to aluminum and its alloys, makes it possible to conduct high-quality and reliable repair of aluminum parts without the use of welding machine.

Using this cold welding, can be effectively and quickly be repaired:

• Aluminum fenders of the car;
• Car radiators;
• Lines made of aluminum or alloys;
• The cylinder head of the car;
• Body panels and other car components.

The Cold welding for aluminium, the price of which depends on the package and is 40 RUB, especially contains a filler, the composition providing enhanced adhesion to aluminium and its alloys.

Now no need to mess with welding machine — can just take a cold welding for aluminum, mix composition hands and begin to repair.