The commonly used connections for steel structures include weld connections, bolt connections, and rivet connections
1. Weld connection is the process of locally melting the welding rod and the weldment through the heat generated by the arc, and then cooling and condensing them to form a weld, thereby connecting the weldment into a whole.
The advantages are: not weakening the section of the component, saving steel, simple structure, convenient manufacturing, high connection stiffness, good sealing performance, easy to use automated operation under certain conditions, and high production efficiency.
The disadvantage is that the heat affected zone formed by welding high temperature in the steel near the weld may cause some parts of the material to become brittle; During the welding process, the steel is subjected to uneven distribution of high temperature and cooling, resulting in residual welding stress and deformation in the structure, which has a certain impact on the bearing capacity, stiffness, and performance of the structure; Due to the high stiffness of welded structures, local cracks can easily propagate to the entire structure, especially at low temperatures where brittle fracture occurs; The plasticity and toughness of weld joints are poor, and defects may occur during welding, leading to a decrease in fatigue strength.