What is cold welding, how to use it and where it is used?

Insulation is essential for maintaining a warm and comfortable environment in our homes. However, are you familiar with cold welding? Although it sounds like something from a science fiction film, this technique is actually quite interesting and has useful uses in insulation and heating.

In short, cold welding is the technique of joining two materials together without the use of heat. Cold welding uses pressure to form a bond between the surfaces as opposed to traditional welding, which melts the materials to be joined. There are endless options for caulking gaps and fastening insulation materials in place thanks to this innovative technique.

So what is the precise application of cold welding in the insulation and heating industries? The installation of HVAC systems is one frequent use. Technicians can guarantee airtight seals and stop heat loss or gain through leaks by cold welding ductwork joints. This enhances interior comfort levels in addition to increasing energy efficiency.

Insulation for homes is another area where cold welding excels. Cold welding can offer a strong and efficient solution for any installation, be it foam board insulation, reflective barriers, or caulking gaps around windows and doors. It is perfect for a range of insulation materials because it can form strong bonds without the need for heat.

However, applications for cold welding aren’t just restricted to insulation and HVAC. Additionally, it is employed in the electronics and aerospace industries. Cold welding, for instance, is used in aerospace to join lightweight materials like titanium and aluminum, producing sturdy connections without sacrificing the integrity of the individual parts.

A fascinating phenomenon known as "cold welding" occurs when two clean metal surfaces fuse together without the use of heat or solder. It occurs when the metals’ atoms come into close proximity to one another and, drawn to one another by nature, form a strong bond. In order to use cold welding efficiently, surfaces must be spotless and free of impurities such as oxides and oils. Applications for cold welding include jewelry making, electronics, and aerospace, among other industries where strong and accurate metal bonding is required. Cold welding is a useful technique in many industries because it can result in dependable and long-lasting connections when surfaces are properly prepared and the process is controlled.

What it is?

When someone mentions cold welding, they typically mean two things. The first method involves applying pressure to materials without the need for outside heat sources. In the event that one of the materials breaks down, the second is a unique adhesive that enables you to "weld" metal, wooden, plastic, ceramic, and comparable pieces of material together.

Apart from its use in joining components, cold welding is also employed in surface sealing.

Varieties of cold welding

Depending on the consistency, application, and price range, the consumer can choose from a wide range of cold welding types available on the market today.

There are two different kinds of consistency in cold welding:


Usual liquid welding procedure using AliExpress

Represents two epoxy resins with the same volume of hardener. Squeeze out the contents of the tubes, mix them separately, and adhere closely to the prescribed measurements. This kind of consistency is probably not appropriate for someone who has never handled cold welding before. It’s possible to mix up the proportions or prepare the mixture improperly, which would prevent the cheapest products from going to the trash can.


Possibly the greatest choice for customers. These small bars, which are used for cold welding, are readily available on store shelves. To use them, simply cut off the pieces as needed, give them a little kneading to provide elasticity, and distribute them across the work surface. After work, the rod should be stored as dry and hermetically as possible to prevent any damage that would render it unusable until it is needed again. Additionally, a comparable kind of cold welding typically costs less than its predecessor; the only drawback is that it requires more "notice."

Several types of welding are distinguished in the field of use because cold welding can perform a variety of functions depending on the complexity of the function, from gluing small damage to the sealing process:


As implied by the name, you can accomplish a great deal, if not everything, with the aid of this kind of welding. It is ideal for handling metal, plastic, and wood. Although having this kind of cold welding on hand is convenient, it is not likely to be appropriate for routine repairs of different trinkets, and the stitches produced are not very even.

For welding of certain material

Although this type cannot claim to be universal in its application, it is a better product because it is designed to work with specific materials, such as concrete, metal, and ceramics. You can get better seams if you use this welding for repairs.

For car repair

The purpose of this kind of cold welding is to eradicate auto malfunctions. Welding has improved tightness and moisture resistance. resistant to heat

Once more, the name speaks. The purpose of this kind of welding is to precisely heat components and materials that are vulnerable to this because of their functionality.

For repair in certain conditions

Working underwater requires a narrowly controlled kind of cold welding. Such a welding mass is also resistant to gasoline, different types of oil, and solvents.

Cold welding application areas

The application of cold welding has a wide range of subfields. These kinds of welding masses are essentially in high demand because of their exceptional resistance to moisture, temperature extremes, strength, and tightness. Furthermore, using oils or solvents to influence cold welding is nearly impossible. You should consider the application area and composition when selecting a welding mass in the store.

I would like to elaborate on a few cold welding techniques that are most frequently used by consumers.

For pipes repair

Using cold welding to repair pipes

Regarding the details of the decision to use cold welding in the event of a breakdown, there are no clear indications. Generally speaking, it is sufficient ordinary universal, ideal for all kinds of pipes, from plastic to cast iron from the Soviet Union. The work algorithm is largely the same regardless of the material the pipe is made of.

  1. First of all, after detecting the place of damage, it is necessary to block water or gas for the purpose of your own safety and comfort.
  2. Next, you should carefully clean the workplace, in case of extreme need, go through the area for the breakdown with sandpaper.
  3. After all preliminary preparations, you can proceed to the preparation of welding mass, depending on its consistency. If this is a liquid mass, then mix the epoxy resin and hardener in the necessary proportion, if dry – cut off the required piece from the whole bar and thoroughly stretch in a slightly wet hands to a state of soft plasticine. After gluing not only the hole itself, but a little more around it.
  4. At the end of the work, you should wait for the mass to dry, as a rule, this takes no more than a day. You can also process the lubricated surface with enamel, but first you need to make sure that the acquired cold lubricant implies any processing.

For plumbing

When it comes to this kind of repair work, you already need to pay attention to the details of the water supply system in order to make the best decision for yourself. For plumbing, for instance, a narrow orientation agent works best. Cold welding not only prevents standard material breakdowns but also works wonders for repairing porcelain fixtures like toilet seats.

This particular case’s welding procedure is the same as the previous one: burr-freeing the working surface, removing old paint and glue, sandpapering it, and then applying a thick layer of mass and letting it dry completely.

For metal

Applying welding to a radiator made of cast iron

You can use both specialized metal welding and universal cold welding for these kinds of breakdowns. Thus, malfunctions like these:

  • heating radiators;
  • gluing between themselves copper, cast -iron and iron elements;
  • repair of metal tanks;
  • Repair of a machine body, exhaust pipes.

The repair procedure is the same as above, but in this instance it’s important to keep in mind that cold welding is only a band-aid fix for damage of this magnitude. You cannot do professional welding work without it.

For plastic

Possibly the simplest and fastest kind of maintenance. A great deal of items in the modern world are composed of plastic, ranging from water pipes to garden tools and jewelry for kids.

Since liquid welding is the least noticeable on the surface and can be used with a handy dispenser to glue even the smallest parts, it is the most successful method for small breakdowns.

A method that is indistinguishable from earlier methods of use.

Cold Welding A process where two metals are joined together without the use of heat, relying on pressure alone.
How to Use Surface preparation is crucial. Clean the surfaces thoroughly to remove any contaminants, then apply pressure to bond them together.
Where it is Used Cold welding is commonly used in space applications, electronics, and in situations where heat could damage delicate components.

Many industries can benefit greatly from cold welding, an intriguing process that joins two metals without the use of intense heat. Clean surfaces of compatible metals can join seamlessly with just a little pressure, forming dependable and robust connections.

The ability of cold welding to maintain the characteristics of the materials being joined is one of its biggest benefits. In contrast to conventional welding techniques that entail elevated temperatures, cold welding mitigates the possibility of material distortion, oxidation, or other types of harm. It is perfect for applications where maintaining material integrity is essential because of this preservation of properties.

In spite of its name, cold welding necessitates a few particular circumstances for a successful bond. The bonding process can be hampered by impurities or oxides on the metal surfaces, so cleanliness is crucial. Furthermore, appropriate pressure needs to be used to guarantee close contact between the surfaces, which encourages atomic bonding.

Because of cold welding’s effectiveness, dependability, and versatility, a wide range of industries, including electronics and aerospace, have adopted it. For joining components without sacrificing their structural integrity, cold welding is an option in the aerospace industry, where lightweight materials and accuracy are crucial. Cold welding is a technique used in electronics manufacturing to join micro-scale devices, guaranteeing their durability and dependability.

Cold welding is used to fabricate materials that are energy-efficient in the context of home insulation and heating. Cold welding helps create long-lasting insulation materials that lower energy costs for homeowners while preserving comfortable indoor environments by precisely joining metal components without sacrificing their qualities.

As technology develops, cold welding will probably become more and more important in a variety of industries since it provides a dependable and effective way to join metals without compromising their integrity. The potential uses for cold welding are virtually limitless, offering breakthroughs in a variety of industries, including construction and manufacturing, with more study and creativity.

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Michael Kuznetsov

I love to create beauty and comfort with my own hands. In my articles I share tips on warming the house and repairing with my own hands.

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