Performing a weld with an electric arc, flame or spot requires a minimum of training and know-how. Cold welding is done differently and with other tools. But what are the advantages of making a cold weld?
Welding consists of assembling specific and similar materials, such as metals or plastic, in a permanent way thanks to the addition of another product (metal, chemical components). This method dispenses with using screws, rivets or bolts to fix two or more parts together.
What does cold welding involve?
If the evocation of welding is often characterized by the fusion of a metal filler to ensure continuity between two parts, this is not the case for cold welding. Indeed, the realization of a cold weld does not require the use of a heat source such as a torch or a welding machine and therefore does not create any melting point causing two elements to combine. Cold welding is done in two different ways:
- via the magnetic pulse;
- via a two-component chemical.
It should be noted, however, that cold welding by magnetic impulse is a rather recent process which requires the implementation of very specific machines and created solely for this purpose. It is therefore difficult, if not impossible, to carry out this type of welding at home.
What is the composition of the product allowing cold welding?
Chemical cold welding is the result of the use of a product with two main components which react chemically with each other to form the cold welding, we speak of polymerization between the products. The grip is very fast.
In general, a cold weld is made from a resin, also called epoxy, and a hardening agent. Other additional products in smaller quantities enter into its composition and in particular give it its solidity. The composition also fluctuates according to the nature of the material to be welded: this implies that the cold weld for an aluminum object will not have the same composition as a cold weld intended for steel.
What materials can be joined by cold welding?
Cold welding makes it possible to combine a large number of materials, sometimes very different from those for which welding with a heat source is recommended. Thus, the metals that can be cold welded are: copper, silver, aluminum, nickel, lead, stainless steel or even cast iron.
But the cold welding process can also facilitate the assembly of rigid plastic materials, it is then very similar to gluing just like universal cold welding. In addition to metal and plastic materials, the latter allows repair or multi-support assembly such as ceramics, earthenware or marble.
Why is cold welding an advantageous technique?
Cold welding has various advantages including:
- ease of implementation because it does not require the installation of any machine or the intervention of a professional;
- simplicity to handle;
- safety in its use because it releases no toxic fumes and the risk of burns is avoided;
- reliability in its use because its result is solid and durable, be careful however to use it only for the use or uses for which it is intended!
You should know that cold welding resists very high heat up to 150°C, or even more. In addition, this process is waterproof, so it can fill a water leak.