What are the three ways to connect steel bars?

There are three main ways to connect steel bars: binding lap joint, mechanical connection and welding.

Binding overlap: A method of connecting two steel bars by tying them together with iron wire or steel wire. This method is simple to construct and low in cost. It will not affect the mechanical properties of the steel bars. It is suitable for occasions with small steel bar diameters, such as small projects such as walls and floors. However, the strength of the binding connection is relatively low, and it is prone to problems such as loose binding and rust.

Mechanical connection: A method of connecting two steel bars together through mechanical connectors. Mechanical connections can be divided into sleeve connections, lap connections, threaded connections, and other methods. The advantages of mechanical connection are high connection strength, reusability, and convenient construction. It is suitable for the connection of large-diameter steel bars. Mechanical connection is preferred for the connection of longitudinal steel bars, and mechanical connection should be preferred for diameters not less than 25 mm.

Welding: A method of connecting two steel bars through the heat of a melting heat source and the fluidity of the metal in a molten state. The advantages of welding connection are firm connection, durability, and simple construction. It is suitable for some occasions with high connection strength requirements, such as large projects such as bridges and tunnels. However, the welding process requires professional operators and equipment, and the heating of the steel bars will cause changes in the organizational structure of the steel bars, thereby reducing the tensile strength and toughness of the steel bars, and it is also prone to cracks and stress concentration.

In practical applications, the choice of connection method depends on factors such as the specific requirements of the project, the diameter of the steel bars, and the construction conditions.