Welding is considered one of the most efficient methods of production on rolled metal products. It is used to create both large-sized complex structures and small items where high precision manipulation is required. Welding works are used quite widely. They are used in such areas as mechanical engineering, transport and construction. This fact is due to significant savings in material (compared to riveted or bolted connections), as well as the high strength of welded structures, their affordable cost.
Types of welding work
It is customary to classify welding according to the condition of the metal in the welded area. The first class – by the way the welded parts of the structure are joined (here the welding can be performed by one of two methods: by pressure or fusion). The second class – by the type of energy used (here we distinguish thermal, thermomechanical and mechanical welding).
Pressure welding has a number of advantages (compared to fusion). Less thermal effect on the metal (lower heating temperature). Accordingly, the material is not exposed to harmful effects that change its properties. Also, the operation requires much less energy.
There are also certain “disadvantages” of this method that limit its application. These include the necessity of using sophisticated equipment, which provides high compression forces on the parts to be welded. Furthermore, at the time of welding, it is important to ensure that the surfaces are as clean as possible. Otherwise, the strength of the joint cannot be guaranteed.
Pressure welding includes the following types:
Fusion welding is considered the more versatile method. It is important to have a powerful heat source that provides local heating until the parts to be welded melt. Sophisticated welding machines are not needed here. Unlike the first option, the heat source is brought to the product (rather than the other way around), which expands the possibilities, allowing for large-scale construction.
Fusion welding includes:
Assembly is also a technological process that is part of the final stage of part processing. It includes the work of joining the elements into a single structure.
Assembly is performed before the welding work. Although they are so closely related to each other that they are usually performed in the same shop. During assembly, the following types of tools are used: marking, measuring, assembly and inventory tools.
Welded structures are divided into two types: lattice and spatial. The first include radio masts, radio towers. The latter are transmission line supports, light poles, towers, masts and so on. For each of the above-mentioned types of structures, the stages of assembly, docking and welding directly apply.