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The first meaning of the term welding that is mentioned in the dictionary of the Royal Spanish Academy (RAE ) refers to welding process and result : set one solid bond between two things with a material that is similar or the same as theirs. In a broader sense, welding consists of amend or repair something .

A welding, therefore, implies the union of two elements: the usual thing is that it is done through the fusion . It is common to add a plastic or a metal which, when melted, ends up joining both pieces. This material that is added makes the joint fixed when it cools.

To achieve fusion and welding, it is possible to appeal to a To be at ultrasound , to a flame generated with gas at Electric arc or to a process of friction , to cite some of the options available.

It is important to note that, due to the characteristics of the job, various precautions must be taken when welding. The people Welding should protect their eyes and hands to avoid burns and damage from ultraviolet light. Sometimes welding also produces toxic smoke, a peculiarity that requires the preservation of the respiratory tract.

The quality and durability of welding depend on various factors. Among them we can mention the concentration used at the entrance of hot , he type of material that was added, the design granted to the joint and the method chosen to perform the welding.

Although welding is one of the most common processes in the industrial field, it also occurs in particular environments and can be carried out with elements that are very affordable at an economic level. With respect to means, medium in which it is possible to weld parts, there are not many limitations, since it can occur in a closed environment, outdoors, under the sea or in outer space.

Let's see below some of the welding systems :

* solid state : One of the features that is obvious from this system, as opposed to the best known, is that it does not require melting any material . Among the methods that are part of this group is ultrasonic welding, which is used to join thin wires or sheets whose manufacture is carried out with thermoplastics or metal. To get them to connect, they are subjected to a vibration at high frequency and at high pressure;

* by arc : in this case, when talking about this system we are recognizing several that are grouped by using a source of electricity to get the weld Thanks to the power supply it is possible to produce a voltaic arc between the base material and an electrode, so that the metals melt. There is the possibility of using alternating current (whose abbreviation is AC ) or continuous (DC ), as well as consumable or non-consumable type electrodes, which are under a coating;

* soft and strong : they are two individual processes that are distinguished from the previous ones by not providing the union of the base metals, but only the contribution. On the other hand, it is also important to note that it was the first system to be used by our species, and dates back to the ancient Sumerian. The temperatures used in both cases, the starting point is 450 ° C: soft welding occurs below it and strong welding occurs above. There is also the strong at high temperatures , a type of welding that requires exceeding 900 ° C;

* gas : In this group, oxyacetylene welding stands out, and it is one of the oldest processes, currently used especially for joining pipes .

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