refers to large-scale building projects. Projects can include public works, bridges, highways, and dams in addition to massive single structures like a stadium or an airport. All of these types of construction projects involve a huge amount of weight that must be safely supported, and building joints are the places that take the most pressure. That's why fasteners are a crucial part of safe building, especially in the heavy construction industry. There are several fastening systems currently in use and these include welds, rivets, and tension control bolts.
Welding is a method of joining two metal parts by melting the edges and fusing them together. The resulting joint is strong and, if done well, visually appealing. For many years, welding was considered the only safe option for load-bearing joints or for structures that have to withstand a lot of vibration. However, welding is time-consuming work, and it requires highly skilled technicians who typically command high wages and may be in short supply. The quality of a weld is key, and it must be inspected for safety, which also takes time. Another potential disadvantage of welding is that the heat can damage the surface of the metal beyond the welding edge.
Rivets are similar to nails in that they are hammered (or punched with a gun) into a pre-drilled hole. One end of the rivet has a head like a nail, and once the other end is punched through the hole, it too is smashed flat so that it is fixed in place at both ends. The tension between the cylindrical rivet and the sides of the holes is what holds the parts together, and this tension also prevents the rivet from rotating when the structure vibrates. Like welds, rivets are considered permanent fasteners because they can't be removed without cutting into the building.
Unlike welds and rivets, tc bolts are considered a temporary fastener because bolts can be removed if the structure needs to be disassembled. Bolt assemblies include a washer, a nut, and a threaded bolt. When shoulder bolt
is inserted into a pre-drilled hold, it is tightened with a special wrench that fastens to a spline on one end of the bolt. Some of the advantages of A325 tension control bolts include speed, efficiency, and accuracy. Technicians do not need any specialized skill because the automatic wrench does all the work and guarantees a precise degree of tension. Moreover, considerably fewer bolts than rivets are required to safely form a joint.