Is the residual stress in steel structure welding residual stress? Or is welding residual stress only the main part?

1. The welding process of steel structure is heating and melting in the local area of the weldment, and then cooling and solidification. Due to the uneven temperature field and the uneven expansion and contraction of the component, the residual stress and deformation are produced in the component, which is commonly known as welding residual stress and deformation

2. The residual stress is produced in the heating and cooling process of hot rolling, oxygen cutting and welding. First, compressive stress is formed in the cooling part, and then tensile stress is formed in the cooling part.

3. Welding residual stress can be divided into longitudinal residual stress, transverse residual stress and thickness residual stress according to its direction.

4. Influence of welding residual stress and welding residual deformation

5. Influence of welding residual deformation on structure

Welding residual deformation not only affects the size of the structure, which makes it difficult to assemble, but also produces initial defects such as initial eccentricity, initial bending and so on, resulting in additional internal force, which affects the bearing capacity of the structure.

6. Distribution and size of welding residual stress

The distribution and magnitude of residual stress are related to the shape and size of cross section, manufacturing method and processing technology, but not to the strength grade of steel.