One-piece connection of metal parts - this is the welding process itself. At the same time, they try to heat the metal itself to a temperature that is optimally suitable for a particular process. But there are also cold types of welding, when heating is not used, and the parts are compressed by mechanical force. As a result, a connection occurs.
Welding process characteristics
When different types of welding are used, metal processing occurs through the use of concentrated or concentrated energy flows. Surfaces must be completely free from contaminants and oxides. This is the only way to hope for an appropriate result. Sedimentary pressure - the so-called pressure that occurs during welding. Thanks to him, a deformation is created at the junction, which allows you to connect the parts. It should be added that only very ductile metals provide the opportunity to use types of welding that do without heating.
Welding processes: on classification
In total, there are two main methods by which metals can combine when heated. For example, when sedimentary pressure is used, plastic deformation is created . In this case, an external force is applied in the form of pressure so that the metal is deformed at the junction. Such types of welding require a solid state from the metal. In addition, in different situations, it may or may not be necessary to preheat the surface. The main thing is that the mechanical properties of the metal do not change at all under such influence.
Melting as a welding method
In this method, the parts are connected when the metal is molten. This procedure is carried out at the point of contact in the parts to be welded. Sometimes filler metal is used, sometimes they do without such additives. Such a process is used, including some types of arc welding. Merging of molten metal occurs arbitrarily. A common weld pool is formed. When the metal hardens, a hard weld is formed .
The main types of welding
If several processes use the same heat source for heating or melting, welding is combined into types. For example, there are types of fusion or pressure welding. Variants of any kind are combined into methods. For example, electric welding methods can be suture, spot and butt. The main species are grouped precisely on such grounds.
Additional classification information
The types of energy used also sometimes become the basis for dividing welding processes into several groups. So, distinguish between electric and gas welding. Conventionally, for example, laser and ultrasonic welding will relate specifically to the electric type. In this case, special devices are used that convert electrical energy, after which it becomes thermal. It is this type of it that allows you to heat the necessary parts to the required temperature.