The welding of sheet metal is one of the most common metal carpentry operations, and consists of joining two or more metal parts.

The welding of steel sheets: techniques and tools of the most common processing

Every day in our lives, we are faced with welded objects without even realizing it. This processing is therefore of fundamental importance in light and heavy industry. While small welds can also be done at home by DIY enthusiasts, industrial welds use special high-tech equipment to achieve fast and precise results. Tecnos deals with metal welding in Milan at its headquarters in Cuggiono.

The different ways of making a weld


The most common methods are MIG-MAG, submerged arc, TIG and laser salting.

In addition, welding can be autogenous or exogenous. In the first case, the joining element is the fusion of the two parts, while in the second case an external connecting element is involved.


The different types of metals on which we operate


Welding is fundamental to obtain semi-finished objects destined to be part of larger elements. It is therefore the opposite operation to cutting sheet metal.

As a whole we work on different types of metals, such as Hardox, Aldur, Alform, s690 steel; and c45 steel and high strength structural steels. But the most common machining is the welding of construction steels such as S275-S355- P265-P275-P355-A516.


The equipment


The most common welding method in the metalworking environment is MIG/MAG.

A high amperage electric arc is created between an electrode placed on the end of a torch and the surface to be welded at a distance of about 12/15mm, in which a metal wire is injected in a constant manner.

This wire, becoming the point of passage of the arc between the torch and the surface to be welded, melts and melts the area of material where the arc is discharged.

Depending on the type of blown gas used to protect the weld pool, the distinction between Mig and Mag welding is derived.

In the former, the gases are inert and only have the function of eliminating oxygen during welding, while in the latter they improve the mechanical and chemical characteristics of the product.

The optimal result is obtained when the welding area has better mechanical results than the rest of the piece.