Cold welding on plastic and its application

Cold welding on plastic and its application Cold welding for plastic: what types are there and how to use it

Welding for a long time used widely enough for industry, everyday life and in construction. One of the most unusual human inventions is the cold welding method for plastic, and in domestic conditions, such an invention significantly facilitates the repair work of household appliances. Making a cold seal for plastic is an incredibly incredible step for the plastics repair industry.

One of the most useful qualities of the cold welding method is the ability to glue broken corners with your own hands without much effort, as well as seal cracks and much more. At the same time, the joint in terms of solidity and strength will be equivalent to plastic.

Due to these properties, most household items, after repair work using the cold welding method, seem to be reborn and get a new life, because their owners may change their mind about throwing out the thing.


In essence, such a human invention as cold welding is an adhesive composition based on epoxy and amine resins with a mineral or metal filler ... Many manufacturers will keep the composition of the filler in strict confidence, because such a component will seriously affect the technical characteristics of the welding element.

More precisely, it will affect strength, solidification rate, thermal stability, ability to interact with water, and the rest. At the moment there is a special type of cold welding, which will serve as an excellent solution for joining plastic parts.

Application as follows:

  • Repair of devices.
  • Car bumper putty.
  • Fishing rod repair.

  • Repair of plastic and plastic pipelines.
  • Bonding of various plastic objects.

Taking into account the above list of works, you can figure out that the area of ​​use of cold welding is very, very large. Cold welding has gained its popularity and vocation not only among professionals, but even among ordinary users. At the moment, it is used to repair plastic elements and for car assemblies, in order to join plastic insulation on an electrical wire, to repair household appliances, plastic handles on knives, spinning rods and much more.

The list of cold welding applications is long enough to cover it in full.


Advantages of Liquid Welding

No heating will occur during the joining process. It is the chemical process that is taken as a basis, or rather, the adhesive composition begins to seep into the surfaces to be joined, and after some time, it solidifies, thereby creating a monolithic seam. To carry out such work, there is no need for expensive equipment and lengthy preparation.Successfully used in construction and industry, liquid welding for plastic products found a niche in everyday life.

Thanks to its incredible properties, its popularity, as well as its versatility and fast adhesion, is growing every day.

We propose to consider some of the reasons due to which the popularity of the cold welding method will continue to grow:

One of the main advantages, along with the strength of the connection, is the absence of heating during operation, ease of use, where special skills are not required, as well as the possibility of repairing devices that have a high level of vibration from strong load. Moreover, the adhesive composition for plastic has an attractive cost, and welding, which does not require high temperatures, plays an incredibly important role in installation or repair, and especially if such work is carried out in a room with a high degree of explosion hazard.

Varieties and classification

Cold welding can be of two types - two-component and one-component. But by consistency, welding can be divided into plastic-like and liquid.

The latter contain a hardener and glue, and both components should be thoroughly mixed before direct use. Plasticine can be both one-component and two-component. If the composition is of the second type, then the components will be kneaded and mixed, because of which a chemical reaction will begin between them.

On the counter these days, cold welding can be found in three varieties at all:

  1. In the form of a tube, the inner part of which is epoxy resin, and outer plays the role of a hardener. You should work with such welding in the following way - cut off a small piece from the tube and start kneading it in your hands until you get a soft and homogeneous mass, which is very similar to plasticine.

    The homogeneity of the substance can be judged by the uniformity of the color.

  2. Two-component mixtures - filler and resin are in different containers, and before use, mix them until a homogeneous composition is obtained.
  3. One-component - the composition will be immediately ready for use, and in appearance it strongly resembles an ordinary stationery adhesive composition. It can be considered universal, because it is most used in everyday life, and it can also glue almost all types of plastics.

To speak about the field of application, or rather about the purpose, then welding can be universal or highly specialized, dedicated to a specific material.

For special welds, the strength will be much higher than that of universal ones, but before starting work, you will need to make sure of which specific materials it is intended for, because otherwise the tool may not give the expected effect. For example, gluing metal parts with a compound that is intended for plastic or wood will be completely ineffective. Most users are very interested in the temperature conditions that the adhesive can withstand. As a rule, all information is indicated on the packaging, and usually for inexpensive products of a universal type, this indicator is approximately 2600 degrees, and for highly specialized expensive formulations, this parameter will be 4 or even 5 times higher.

Instructions for use

The most important task before using the product is to thoroughly familiarize yourself with safety measures.

  1. You will need to protect your eyes from getting into the bottom of the adhesive, and also avoid getting it on open areas of the skin. For this reason, you will need to wear protective gloves and goggles before starting work.
  2. Keep the cold-welded plastic tube out of the reach of animals and children.
  3. Store the product in a dark place.
  4. Please note that the adhesive should be as far away from food as possible.

Please note that if you suddenly find that the composition has become very hard inside the tube, this can easily be removed by heating for 1/3 hour. For example, you can keep the heating tube in hot water.

By the way, the cold welding process is extremely simple, and before gluing the surface on which the composition will be applied, everything should be sanded with sandpaper to increase the degree of roughness, which will have a strong enough effect on the adhesive parameters of the plastic. Next, such surfaces should be degreased, and any solution containing alcohol is perfect for this. The cold weld will be distributed over the surface of the product against which the second plastic part should be pressed.

Within four minutes, the products will begin to set together, and after 15 minutes they will fully connect with the required strength.

Useful recommendations from leading experts

It is rather difficult to choose the most suitable brand of the product due to the incredible variety of adhesives in the form of cold welding, and list all kinds are very difficult. For the correct choice, it is worth starting from the technical characteristics of the product. In the event that you plan to use high temperature welding, it is advisable to find out this characteristic in advance.Sometimes it is even less than that of plastic, and this can greatly worsen the quality of work in the future.

So, let's consider some useful recommendations for using plastic:

  1. Cold welding on plastic and its application In order for the final result to be as good as possible, the plastic surfaces to be joined must be slightly warmed up.
  2. From the first point follows the second, or rather, what should be remembered about the following rule - the higher the temperature, the faster cold welding will solidify, and because of this, the strength of the weld may be reduced. For this reason, before you heat everything, it is recommended to think about how this will be done. For example, using a hair dryer for this will not be a good idea.
  3. In the event that all the parts that you plan to connect to each other are subject to a high degree of vibration, you should think about what they need to be replaced with new ones.

    The fact is that there is a high probability that cold welding will not be able to withstand such loads. In addition, it is important to thoroughly approach the selection of a product, for example, to use not a universal adhesive sealant, but a specialized one that can withstand strong vibrations.

  4. In addition, such a characteristic as the appearance of the welded joint will not be in the last place, because sometimes this can ruin the entire appearance. In this case, as in the third paragraph, it may make sense to think about how to install all the new details.
  5. By means of cold welding, you can carry out repair work on a wet surface, but this will require the use of a special compound, not universal.

    In this way, you can eliminate leaks in plastic pipes, through which the movement of water is carried out under low pressure. But here it should be remembered that such welding will only be a temporary solution to the problem.

  6. If we are talking about repairing pipelines or even pipelines that are made of plastic pipes, then a reasonable solution would be to use a compound that can withstand constant contact with water.
  7. If the welding begins to harden strongly, then before using it, you should slightly warm it up, and for this you can use a hair dryer, or simply put the tube on the radiator / under direct sunlight, and 1/3 hour is enough for your head ..


Before buying, it will be equally important to study the label on the packaging of cold welding for plastic, which indicates the composition, date and instructions on how to work with them. Thus, you can conclude that cold welding is an ideal material that will help you to connect plastic parts without problems in our time. The process will be simple, the composition itself is relatively low cost, but most importantly, when working with cold welding, you must comply with all the manufacturer's requirements, which are prescribed in the instructions.


Andrey, Krasnodon: "I repaired the fuel tank myself.

Imagine taking it off the car, hovering, then soldering it for a long time - it's all inconvenient. I climbed in, and there was a very thin hole, as if pierced with a needle, and the jet was like from a syringe. Friends tried to convince that cold welding would not help, but decided to try, because they did not lose anything. After that I drove calmly as before, and even when I was selling the car, everything was in perfect order. "

Egor, Yeysk:" Previously, excellent welding from the Almaz company was constantly used, but now it has ceased to be imported to hardware stores.

But other means began to appear for replacement, and this is an obvious fake, although identical in appearance. Complete rubbish, nothing "welds". But I learned that the real "Almaz" has now changed its name and now "Almaz-Press". The packaging also looks different, but the effect is as before - chic and shine. Now I'm ordering normal welding by mail and I'm not overjoyed.