Why does the bridge crane have welding deformation?

The bridge crane should be welded before use. In the process of welding, there will be welding deformation. Why does the bridge crane have welding deformation? Let Shandong bridge crane manufacturer introduce it to us.

1. The welding deformation of bridge crane is found in the maintenance process, and its deformation control has become an urgent problem to be solved. Because the section shape of the bridge crane is a typical box girder structure, it has many welds, complex structure, large welding stress and deformation. If the reasonable design and construction process plan are not adopted, the deformation will occur in the welding process, which will seriously affect the welding quality, and even lead to the incorrect installation and use of the structure.

2. To control welding deformation, it is important to fully understand the causes of deformation, which is conducive to taking appropriate measures according to the specific situation to reduce the degree of welding deformation to a small value, so that its structure can be used correctly and reasonably, so as to better improve the performance of overhead crane and provide guarantee for better construction.

3. Usually, the main reason for welding deformation of overhead crane is uneven heat input. The size of heat input is closely related to the material and structure of welding. Material factors and structural factors jointly affect the movement of metal around the heat source, making it receive the influence of internal and external binding forces at the same time, resulting in stress deformation of welding materials. Welding deformation mainly includes shrinkage deformation (longitudinal and transverse shrinkage), bending deformation, angular deformation, wave deformation, distortion deformation and other types, Reflected in the external structure of the bridge crane is to show local uplift, distortion, bending and distortion.

4. During the welding process, these problems will be caused by many reasons, such as the size of the weld is not accurate enough, the number of welds does not meet the predetermined standards, there is a great error between the welding position and the design position, the thermophysical properties of the welding materials are not strong, the construction process is not conducive to achieving a good welding state, the selection of welding parameters, etc, Each specific link must be carefully grasped in order to achieve the desired effect.