Surely those who at least once engaged in the repair of automobiles, central heating pipes, plumbing, etc., came across such a thing as cold welding for metal, and they will probably say that this is such a two-component adhesive with the addition of metal powder. On the one hand, this is so, but on the other hand, a similar answer would be incomplete, since this concept also has a different meaning.
1. Cold welding by plastic deformation
According to the existing GOST 2601-84, cold welding of metal is welding performed without the use of any heat sources, the connection of metal parts in which occurs due to significant plastic deformation resulting from mechanical stress on the connected elements.
This type of welding is used to connect parts made of copper, nickel, lead, silver, cadmium, iron. Especially this method is effective for fastening parts of dissimilar metals or when using metals that are sensitive to heat. Cold welding by plastic deformation can be spot, suture or butt.
Soldering elements using this method is a rather complicated process and requires special equipment, and therefore the most widely used (especially in everyday life) is another way.
2. Cold welding for epoxy-based metal
This method is unique in that it allows you to connect parts from a wide variety of materials: metal, ceramics, plastic, glass, wood, etc.
Cold welding for metal available on the market today , the price of which usually does not exceed one hundred rubles, is available in various packaging options: whetstones, jars, tubes. But, regardless of the embodiment, it is always based on epoxy adhesive with the addition of metal powder to give special strength. In addition, various fillers, modifiers, plasticizers, etc. are added there. In any case, cold welding for metal has two components in its composition - resin and hardener, after mixing of which the hardening process begins.
Since this type of welding is tight enough, it is often used to repair pipelines, gas tanks, radiators (including central heating radiators).
Cold welding for metal: instructions for use
Depending on the type and manufacturer, it can be produced in two tubes or jars, which must be mixed together before use. The most practical option is cold welding for metal in the form of a bar.
Using it is not difficult. First of all, it is necessary to prepare the fastened surfaces, which must be cleaned of dirt, if possible, washed and degreased. For this, gasoline or any solvent is suitable. Then it is necessary to take the necessary amount of welding with wet hands and knead in the hands for about 3-5 minutes, until it resembles plasticine in its consistency. After that, apply it to the parts to be joined and press. If necessary, remove excess welding with a spatula. Full drying of cold welding occurs in a day, after which the product can be safely operated.