How and with what glue to glue metal. Choosing how to glue metal to metal Which glue for metal is better

The question of gluing metal parts arises not only among professionals. In everyday life, sometimes it becomes necessary to repair a product. In families with children, it is often necessary to restore the performance of toys.
Without knowing the properties of adhesives, it is impossible to properly glue. And if you need to glue a metal part to another material, or glue two metal parts together, then modern adults cannot do such a simple job. For some, it turns out to be easier to throw away and buy a new one than to restore the right thing with your own hands.

Requirements for adhesive for metal

In order for metal parts to be connected with glue, you need:

• know how the product will be used. An object can stand idle on a shelf, decorating it with its presence;
• what final strength should the joint withstand after gluing;
• what loads to take. For example, there may be only a small static load. There are nodes that experience dynamic loading;
• what and with what needs to be glued, when two metal parts are connected, they are guided by the features of the metals. It is possible to glue metal and porous material, there will be other fixation conditions.

Metals corrode due to moisture in the air. Some binders lose their properties when wet. They just swell, the glued parts fall off. Operating conditions may require the finished device to be outdoors. Here, the glue must be waterproof, and withstand temperature changes.
So, glue for metal should provide a number of conditions for use:

• provide maximum connection strength to ensure reliable use of parts;
• retain their properties for a long time;
• maintain the quality of gluing regardless of temperature;
• be waterproof;
• shrinkage after curing should not be large;
• be chemically neutral and protect the bonding site from corrosion.

In order to properly perform an adhesive joint, it is necessary to take into account the physical and mechanical characteristics of the materials, as well as the features of the geometry of objects.

How to choose a waterproof adhesive for metals

What do manufacturers offer for gluing metals? The list is quite large. You should first understand the features of the proposed product.
Waterproof glue for metal is divided into groups according to its structure:

• acetone-based solutions - here soluble plastics are used as a binder. After the solvent has evaporated, only plastic remains, connecting different materials. Adhesives of this group connect different objects well, but when the temperature rises, destruction occurs in the gluing zone;
• polymerizable organic substances quite effectively fix different types of materials. There are elastic ones: BF-6 glue, 88 glue, and also hard ones - BF-2 glue. A solvent is added to them to give fluidity, it also evaporates;
• two-component epoxy-based binders give the strongest bonds. They require special surface preparation, as well as compliance with the ratio of the volumes of resin and hardener;
• double-sided tape is an intermediate element that is placed between metals or other objects to be joined. Available in several strength options. Many installers prefer to use this type for hard fixings;
• cold welding - these are one- and two-component viscous plastics that must first be kneaded so that the adhesive included in their composition begins to work;
• A thermoplastic superglue that liquefies when heated and hardens when cooled. Such materials are used very limitedly, the reliability of the connections is low. Applied only for short-term use in critical situations;
• Hot melt adhesive is a relatively new type of thermoplastic used in hot glue guns. Suitable for small repairs. It is used by needlewomen. There, hot melt glue has an undeniable superiority over other analogues.

You should familiarize yourself with some branded types of glue for metals.

1. "Super Moment Maxi" - glue from Ireland. It is recommended for gluing products made of polymeric materials to metal objects. The adhesion is quite noticeable. May form a thin film. After 8 hours, the manufacturer guarantees high quality gluing. You must strictly follow the instructions.
2. KLEBER 645 - recommended for gluing luminaires, the body of which is made of galvanized steel. Bonds metal and plastic. Gives a good bond with wood. Waterproof. The manufacturer's website provides examples of gluing the metal frame of the greenhouse. A certificate is also presented, which shows the full characteristics.
3. 690 2K MS KLEBER is a two-component adhesive. Recommended for strong seams. The manufacturer claims that it is safe for them to connect elevator parts. Careful preparation of surfaces and observance of the modes of fixing parts are necessary.
4. PURAFLEX 9155 is a one component adhesive. Not only does it have excellent water resistance. It is characterized as a heat-resistant adhesive for metal. Maintains within 8 hours temperature of 200 °C.
5. PURAFLEX 9140 is a one component adhesive. It is used in automotive and aircraft manufacturing. Allows rubber to be bonded to metal. Retains elasticity in the gluing area.
6. ED-6 - epoxy adhesive, transparent yellowish color. Implemented together with a hardener. In practice, metal powders are added to it, which strengthens the connection. Suitable for responsible fixation of connected products. Complete polymerization occurs after 24 hours.
7. EDP ​​glue (ED-20) is an analogue of ED-6, but is more often used for the manufacture of mastics for sealing cracks and damage in metal.
8. BF-6 - glue for connecting rubber, porous materials. Can be used for bonding to metal.
9. BF-2 is a strong adhesive for rigid joints, full strength is achieved after curing at a temperature of 180 ... 200 ° C.
10. Glue 88 - the favorite glue of shoe manufacturers, is quite plastic, well connected with metals.
11. Shoe "Marathon", an analogue of 88 glue. Very expensive, imported from Germany.
12. "Titan" is an excellent glue soluble in acetone. Quickly seizes, holds up to 80 kg / cm 2. Easy to use.
13. Liquid nails "Moment Installation" - the adhesive is inside the tube. To work, you need a mounting gun. Used by car repairers.
14. Cyanoacrylate "Cosmofen" is one of the best representatives of adhesives. Expensive, but shows the best results.
15. Plexus A420 - universal adhesive, connects different parts, the manufacturer gives a guarantee for multiple combinations.

How to glue metal? - the question is asked quite often in various forums. Solutions to such issues should be considered on separate examples.
During the operation of cars, the fuel tank is sometimes damaged (in modern cars it is located under the trunk in the lowest part). It can be repaired without even taking it out, you just need to use the pit or install the car on a flyover (raise it on a lift). Epoxy resin option (Fig. 1).
Rice. 1 Sealing the fuel tank with epoxy

1. It is necessary to clean the place not only where there is damage, but also nearby.
2. Mix the resin with the hardener in the proportion indicated on the package.
3. Prepare pieces of cotton fabric according to the size of the cleaned spot.
4. Soak fabric in epoxy.
5. Straighten and apply to the cleaned stain.
6. Apply at least three more layers of epoxy-impregnated fabric.
7. Apply the remaining resin with a stick around the repair site.
8. To speed up drying, you can slightly heat it with a hair dryer (not higher than 80 ° C, so that gasoline vapors do not ignite).

Attention! Perform work in polyethylene gloves in a ventilated area.

Option to use glue "Moment" (Fig. 2).

Rice. 2 Fuel tank repair with Moment glue

1. You need thick fabric. A small piece is cut out of it to cover the area of ​​\u200b\u200bthe existing hole. Some users use thin fabric with multiple layers.
2. Clean up the area around the damage, use the skin.
3. Degrease with any solvent, preferably 646 or acetone.
4. Completely saturate the fabric. You can also use analogues of glue "Moment".
5. Lubricate the place of gluing with glue, you need a thin layer, so it is advisable to smear it with a brush or stick.
6. Hold the impregnated fabric for a couple of minutes so that the glue is saturated with air.
7. Attach the impregnated cloth to the place of the breakdown, it is desirable to straighten it well and press it.
8. After complete polymerization of the glue, touch up the place with nitro paint.

Practice has shown that fuel tanks repaired in this way serve until the end of the vehicle's life. Waterproof glue is reliably kept under difficult working conditions of a car.
Modern adhesive materials designed to work with metal allow you to connect products in a variety of combinations. If the technology is observed and the components for work are correctly selected, then a high quality of fixing the elements is achieved.
Metal glue with frost-resistant properties should be in the motorist's first aid kit. With it, you can always perform repairs of any complexity on the road.

Video: The best glue for plastic and metal.

At work and at home, there are situations when you need to glue two metal surfaces. Welding, traditionally used to weld one metal part to another, and the high-precision work of machine operators have been replaced by new methods. When choosing how and with what to glue metal to metal, Loctite glue is in the zone of attention. Due to its quick fixation, reliable connection of parts, and convenient application, the adhesive is in demand in workshops for the repair of household appliances and vehicles. Glue is also used at home.

In Loctite products, fast curing, adhesive strength coexist with other properties that are important for the performance of the bonded part.

For materials that are difficult to glue together, like metal, combining it with plastic, it is used to connect plastic and elastomer. Low viscosity glue is applied in a thin layer, up to 0.25 mm. Strong adhesion is ensured when the parts are tightly connected. The adhesive is effective in gluing small parts - it sets from 2 to 10 seconds, withstands high temperatures (+120 °C) and low temperatures (-40 °C).

It is intended to connect the surfaces of metals, plastics, rubbers in different combinations, glue of medium viscosity. Loctite is applied to the metal surface after degreasing. Setting time from 30 sec to 1 min for mild steel, 40 - 80 sec for aluminum, from 30 sec to 1.5 min for zinc dichromate allows you to glue complex and large parts. The manufacturer does not recommend using the composition in an environment rich in oxygen and other oxidizing agents.

You can glue different metals with a high adhesive agent. The resulting high strength joint allows abrasive machining of the resulting part.

How to degrease the surface before gluing metal

To create a reliable contact when gluing metal objects helps to remove burrs and clean rust with abrasives, degreasing the surfaces to be glued with solvents. The use of water and aqueous solutions with detergents leads to the appearance of rust.

Highly active gasoline, xylene, solvent, rubbing alcohol, acetone, thinner 650 and considered the driest 646, a recently introduced universal degreaser, have proven themselves well.

During cleaning, a lint-free cloth, often a cotton rag, is used. Textiles are moistened with a degreasing agent and the metal is wiped section by section until the napkin stops blackening and the surface becomes smooth and shiny.

Solvents are caustic and can be harmful to health if used improperly.

Loctite is part of the German corporation Henkel and has been producing high-quality sealants and adhesives using innovative technologies for more than half a century. She focuses on industrial problems solved by gluing a wide variety of materials, sealing threads, creating a protective coating, sealing the layer between materials, sealing.

By using Loctite 222 on “tired” metal to fix parts that could break when disassembled, it was possible to extend the life of many metal structures.

Loctite 243 can be used in harsh environments and can withstand temperatures up to 180°C. In pumps, gearboxes, engines, vibration is not terrible for fasteners fixed with glue with threads and bolts. Threaded connections, including stainless steel and zinc, can also be coated with Loctite 270.

Loctite 3472 is a liquid metal that allows you to restore worn, damaged equipment.

When carrying out restoration work, both the user characteristics of the means and the convenience of their use are important. Aerosol cans, containers of different capacities, designs of packages with a piston - everything is thought out for the convenience of users.

• Improved shaft wear resistance

Loctite 660 is used to strengthen the shaft structure.

Filling the gap is easy, just press the piston to squeeze out the glue.

A prepared part, machined from metal, is attached to the area filled with glue.

The shaft is ready to go.

• Car repair. Eliminate part discrepancy

To fix the two parts, glue is applied along the contour of the unscrewed part, and the parts are connected.

The glued parts are screwed in, as provided by the manufacturer of the structure.

In everyday life, it may be necessary to glue two metal products together. Unfortunately, ordinary glue, designed for instant bonding, will not work for these purposes.

How to glue metal to metal - read our article.

How and how to glue metal to metal: instructions

First of all, you need to decide on the glue. For gluing metal, brands such as "Superglue Moment for Metal" or "Epoxilin" are suitable. For a reliable connection, it is better to purchase "Cold Welding" at a car parts store. Usually the product consists of two tubes - one with the active substance and the second with the hardener. You will also need a bottle of solvent.

1. Prepare the surfaces of the products - wipe them with a cotton pad or cloth soaked in solvent. Alcohol, cologne, vodka or glass cleaner are also suitable for these purposes.
2. If there is rust on the surface, it will also need to be removed. Treat the part with sandpaper or a metal brush.
3. In addition, you need to prepare several tools. If you need to glue small metal parts, you will need a toothpick. If a wide surface is to be glued, then prepare a thick needle or other sharp tool.
4. If you are gluing wide surfaces, then they should be scratched for a stronger connection.
5. Next, you need to lubricate the surfaces with the selected adhesive. If the parts are small, then the glue should be applied with a toothpick.
6. Apply adhesive to both surfaces to be bonded. Wait a couple of seconds for the adhesive to become viscous, and then connect the surfaces. Hold the surface for a few seconds and then set aside. See the gluing time on the package: usually five to fifteen minutes are enough to completely cure the composition.

Modern adhesive mixtures allow you to firmly connect metal to metal, and if necessary, metal to other materials.

The joining of metals on glue is widely practiced in the auto, aircraft and shipbuilding industries. They are used not only for planar or point connection of metal blanks, but also constructive.
In principle, there are two types of adhesives: one-component and two-component. In addition, they are divided into fast and slow curing adhesives. Which glue to use depends on the shape and surface properties of the blanks, as well as on the loads that the joint will then take.
To ensure a strong bond between the workpieces to be joined, the contact surfaces must be thoroughly cleaned and degreased. This is the only way to achieve the strength of joints comparable or even superior to soldered and welded ones.
It is convenient to work with glue. It is simply applied to the contact surfaces, and the parts to be glued are pressed tightly against one another. Special equipment here, as a rule, is not required.

PREPARATION OF BLANKS FOR GLUING

The strength of the adhesive bond largely depends on how well the parts are prepared for gluing.
First of all, mechanical cleaning is carried out, the purpose of which is to remove dirt, grease, paint or rust. To do this, the contact surfaces are treated with sandpaper with a grit of 60 or 80.
The chemical cleaner must be compatible with the adhesive and the material of the parts to be bonded. Typically, the instructions for use of the adhesive indicate cleaning agents that can be used to prepare the surface to be treated.

Only carefully cleaned contact surfaces during gluing give a strong connection.

After cleaning, the surface is washed with one of the recommended cleaning agents. It can be acetone, alcohol, refined gasoline.

STRUCTURAL JOINTS BASED ON TWO-COMPONENT ADHESIVES

The contact surfaces of the parts are carefully degreased and treated with a sandpaper.

A mixture of liquid or pasty consistency is prepared from the two components, depending on the nature of the compound.

Glue is applied with a spatula to both parts to be glued.

From the glue protruding from the joint of the pipes, a uniform seam is formed with a spatula, providing a strong and tight connection.

After the glue has cured, the seam (as well as welding or soldering) is processed with a file.

From a mixture of metal powder or sawdust with glue, you can form the missing part of the part or plug, fill the cavity with it.

Such adhesives have good adhesion and filling properties, do not shrink, and are resistant to compressive loads. But they don't work well for cutting.

Two-component adhesives based on vinyl or epoxy resin have proven themselves excellently when joining aluminum parts.

Liquid glue is applied in a thin layer when gluing small parts. To obtain a seam at the joints of parts, the glue is applied in a thick layer.

FAST-CURING "SECOND" ADHESIVE

The clamps can be removed already 4-5 minutes after compressing the blanks to be glued together. The connection can be loaded after 24 hours.

The sprayable activator speeds up the reaction and increases the strength of the bond.

CONTACT ADHESIVES

Contact adhesives are versatile, but they shrink when cured. In this regard, the surfaces to be glued must be smeared around with an allowance of 1-2 mm.
The thinner and more evenly the layer of glue is applied, the stronger the connection will be. The glue applied to the surface must be allowed to dry out. After about 15-20 minutes, the parts are pressed against each other for a short time.

ELASTICITY

Most one-component contact adhesives are permanently elastic. Therefore, they are unsuitable for joints subjected to shear loading. They are ideal for bonding workpieces with large contact surfaces that are not subject to high loads.
Often they are used where other adhesives for metal are ineffective, as well as when gluing metals with other materials. Serious problems can arise when joining metal with plastic, which is sensitive to the solvent contained in the adhesive. In this case, it is desirable to check the connection on a test sample.

If you need to stick one part on another (in this case, it is a pencil stand), an imprint is made at the place of gluing and glue is applied in a thin layer.

"COLD WELDING"

Recently, adhesives under the conditional name "cold welding" have appeared on sale. These adhesives are resistant to boiling water, oils, gasoline and dilute acids. They are able to withstand temperatures from -30 to +100°C.
Adhesives of the "cold welding" type are applied to the contact surface in thin layers. Each subsequent layer is applied only after the previous one dries. This method of application eliminates the sharp shrinkage of the adhesive and its "spreading" between the parts.
In conclusion, the edges, seams and edges of the blanks are repeatedly smeared with glue, thereby creating the so-called "stiffening ribs". Time of hardening of glue in connections between details - 3-4 days.

The adhesive is applied to the contact surfaces in several thin layers. Before applying the next layer, you must wait until the previous one dries.

"Stiffening ribs" make the adhesive bond more durable. The seams around the place of gluing are filled with glue, which is also applied in layers.

TYPES OF ADHESIVES

The photo shows three groups of adhesives: "secondary" (bottom left), two-component (middle and top) and one-component (bottom right).

Adhesives can be in tubes, jars and jars. In a printed container, glue loses its properties over time, so it should not be bought in reserve.

"Second" adhesives are fast-curing, but their use is limited to joints that experience tensile and compressive loads.
Two-component adhesives cure slowly (24 hours or more). In the instructions for their use, as a rule, recommendations are given to reduce this time, by heating the place of gluing. Such adhesives are also used for structural (power) connections.
One-component adhesives are a kind of competitor to "second" adhesives in terms of applications. However, they are more elastic and shrink. Therefore, they are mainly used where connections are not subjected to heavy loads.

WARNING: SAFETY PRECAUTIONS!

All adhesives for metal are "pure chemistry" and contain aggressive solvents. When working with them, it is necessary to carefully ventilate the room. Work should be in a protective mask under the hood (or in the open air) and rubber gloves.

Modern high-quality adhesives and sealants for metal are distinguished by a unique composition. Glue can be applied both on the entire surface and pointwise. Let's analyze the properties of these mixtures.

Metals were first glued during World War II.

Today, the need to work with metal arises constantly using such adhesive options as:

• Super Epoxy ,
• bison,
• Mannol for bonding metal makes the task much easier.

Steel bonding agents provide high-pressure sealing, smooth seams, bond materials that cannot be welded, and adhere to non-metallic materials.

Purchase both one and two-piece epoxy adhesives for metal can be in any store. The mixtures are divided according to the degree of setting into fast-acting, as well as those that require a certain exposure.

The selection of the product should be based on the characteristics of the surface, as well as the load that will fall on the adhesive joint.

How to glue metal to metal

For bonding metal surfaces, manufacturers offer one- and two-component formulations, as well as various auxiliary agents.

They will qualitatively fasten products only if the surfaces are carefully prepared, as well as evenly distributed and used according to the manufacturer's instructions.

Overview of popular tools:

• Adhesive materials Permabond - provide strong adhesion of materials, are easily distributed over the surface. The seam is sealed, so the risk of corrosion is minimal. The composition contains methyl cyanoacrylate, which allows gluing not only metal, but also other surfaces.
• Adhesives based on epoxy resins - involve mixing two components, give a strong adhesive seam that is resistant to moisture and wear.
• Glue " Moment Super Epoxy Metal» - bonds aluminum, iron, steel, copper and other metal surfaces equally well. The resulting seam does not shrink, does not expand.
• Dublfix double-sided adhesive tape is a versatile innovative material that adheres well not only to metal to metal, but also to wood and other surfaces.
• A two-component "cold weld", such as Poxipol, consisting of two tubes. In one - hardener, in the other active substance.

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The procedure for gluing metal surfaces for example Poxipol:

1. Prepare surfaces: degrease them, if there is rust, clean them with sandpaper. This will help to get the best contact between the two surfaces.
2. Mix hardener and active substance in equal proportions (unless otherwise indicated in the instructions).
3. Apply the mixture to both surfaces and press them together. On average, the setting of epoxy compounds takes up to 15 minutes.
4. After this time, the glued items can be used.
5. The hardened adhesive seam can be processed with sandpaper or a file.

How to glue glass to metal

There are many effective substances on the market that can hold glass and metal together.

1. Verifix MV 750 is suitable for working with transparent glass, such as reinforced, tempered or mirror on the reflective side.
2. They also use composition B 682-0, which has proven itself among professionals and amateurs.

If you are working with patterned, structured or sandblasted glass, you will need a higher quality transparent metal adhesive. On smooth surfaces, it is important to apply a thin layer to improve bond strength.

1. It is important to degrease and remove all substances from surfaces.
2. At the same time, the degreasing agent should not leave films, that is, kerosene, acetone and gasoline are not suitable.
3. It is worth heating the glass to 30 C, for example, with a hair dryer.
4. The seam should be in a horizontal position, and after joining, it should be treated with ultraviolet light twice.
5. Irradiation time can vary from two seconds to several minutes, depending on the characteristics of the material. The first irradiation provides about 60 percent of setting, the second - the remaining 40.

Experts prefer modern UV glue for glass and metal, which provides a strong and elastic bond, is distinguished by reliable protection against yellowing and resistance to moisture. The composition hardens when exposed to light, suitable for the manufacture of glass furniture, showcases.

What is liquid metal glue - how to use it

Glue liquid metal is a vinyl-based composition. Contains metal powder and synthetic paste.

It is used not only to connect metal surfaces, but also any other, the fastening of which is possible only by welding or soldering. At the same time, there is no need to solder in the truest sense of the word, since this glue is able to cope with a wide range of tasks.

The method of "cold welding" is very popular, as it requires a minimum of time and money, anyone, even an inexperienced master, can handle it.

Cold welding connects lead, copper, nickel, aluminum, iron, silver, cadmium and other metals, including those sensitive to heat.

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Advantages of cold welding:

• metal does not deform
• the seam is neat and durable,
• after the "liquid metal" there is no waste,
• no special tool required
• environmental friendliness and safety of the technique.

The composition of the glue "liquid metal":

• epoxy resins acting as a base,
• metal Component,
• additional ingredients, such as sulfur.

The consistency of "cold welding" can be:

1. liquid - these are two-component adhesive compositions,
2. plasticine - presented in the form of bars, similar to plasticine.

For gluing by the "cold welding" method, you need:

• glue,
• acetone,
• clamps,
• sandpaper.

Operating procedure:

1. Prepare surfaces: clean with sandpaper, degrease.
2. If a two-component adhesive is selected, mix hardener and resin. If the glue is plasticine-like, knead it with your hands.
3. Apply the composition to the surfaces and firmly connect them using clamps for fixing.

It takes up to 8 hours for the glue to set, after which you can start puttying and painting products.