(1) Weld connection
The welding seam connection is the partial melting of the welding rod and the weldment by the heat generated by the arc, and the welding is condensed into a weld by cooling, thereby connecting the weldment into a whole.
Advantages: does not weaken the section of the component, saves steel, simple structure, convenient manufacturing, large connection rigidity, good sealing performance, easy to use automated operations under certain conditions, and high production efficiency.
Disadvantages: The heat-affected zone formed by the welding high temperature of the steel near the weld may be brittle in some parts; the steel is subjected to uneven distribution of high temperature and cooling during the welding process, which causes the structure to produce welding residual stress and residual deformation, which is harmful to the structure. Bearing capacity, rigidity and performance have a certain influence; due to the high rigidity of the welded structure, once local cracks occur, it is easy to expand to the whole, especially at low temperatures. Defects may occur, reducing fatigue strength.
(2) Bolt connection
Bolt connection is to connect the connecting parts into a whole through the fasteners such as bolts. There are two types of bolt connection: ordinary bolt connection and high-strength bolt connection.
Advantages: simple construction process, convenient installation, especially suitable for site installation and connection, and also easy to disassemble, suitable for structures that require assembly and disassembly and temporary connections.
Disadvantages: It is necessary to make holes in the plate and to align the holes when assembling, which increases the manufacturing workload and requires high manufacturing precision; bolt holes also weaken the section of the component, and the connected parts often need to overlap each other or add auxiliary connections Plate (or angle steel), so the structure is more complicated and expensive steel.
(3)Rivet connection
The rivet connection is a rivet with a semicircular prefabricated nail head at one end, the nail rod is burned red and quickly inserted into the nail hole of the connector, and then the other end is also riveted into a nail head with a rivet gun to make the connection tight solid.
Advantages: The riveting force is reliable, the plasticity and toughness are good, and the quality is easy to check and guarantee. It can be used for heavy-duty and directly bearing dynamic load structures.
Disadvantages: The riveting process is complicated, the manufacturing costs labor and materials, and the labor intensity is high, so it has been basically replaced by welding and high-strength bolting.
