Spot Welding.
Spot welding is a technique used to join metals. During this process, a flow of electric current passes through two metal sheets, creating heat dissipation between the pieces until they are fused together. The types of resistance welding differ according to the type of piece to be welded and the way in which the current is applied to the pieces:
- Spot welding
- Projection welding
The current necessary for welding is generated by the system, which in our case consists of several robotised production cells with two tables: the first is used to load the components to be welded, and the second is where the components undergo the assembly process. Resistance welding is used to join two or more sheets of various types of material, each with a maximum thickness of 4 mm: pickled and galvanised sheet metal.
In recent years, spot welding has evolved drastically and has found its optimal dimension with the advent of the medium frequency source, which consists of working with a direct current that is much more constant and precise than in the past, when we were forced to weld with a single-phase source, having considerable differences in current delivery on the secondary and crazy absorption in the primary.
Today, medium frequency has given very positive results as it allows us to perform cold welding, drastically reducing the thermally altered area of the point itself.
This also means we use fewer copper electrodes because, as they heat up less, the material lasts longer. It is also suitable for projection welding, which consists of welding one or more bosses at the same time (for example: nuts and bolts). It is a safe, fast method and, in terms of fumes released, almost non-existent!
