The main reasons for the welding deformation of bridge cranes
Time:
2021-09-10 16:04
Overhead cranes are hoisting equipment that is horizontally placed over workshops, warehouses and material yards for material hoisting. Because its two ends sit on tall concrete pillars or metal supports, shaped like a bridge. Overhead cranes are widely used in engineering and production, but many problems will occur during use.
During the maintenance process, the welding deformation of the bridge crane is found, and the control of the deformation has become an urgent problem to be solved. Because the cross-sectional shape of the bridge crane is a typical box girder structure, it has many welds, complex structure, and large welding stress and deformation. If a reasonable design and construction process plan is not adopted, deformation will occur during the welding process, which will seriously affect the welding quality, and even cause the structure to be unable to be installed and used correctly.
The important thing to control welding deformation is to fully understand the causes of deformation, which is conducive to taking appropriate measures according to the specific situation, so as to reduce the degree of welding deformation to a small value, so that the structure can be used correctly and reasonably, and the bridge can be better improved. Various performances of cranes can provide guarantee for better construction.
Usually, the main cause of welding deformation of bridge cranes is caused by uneven heat input. The size of the heat input is closely related to the material and structure of the welding. The material and structural factors together affect the metal movement around the heat source, so that it is affected by the internal and external constraints at the same time, resulting in the welding material. stress deformation.
Welding deformation mainly includes shrinkage deformation (longitudinal shrinkage and lateral shrinkage), bending deformation, angular deformation, wave deformation, twisting deformation and other types.
In the welding process, these problems can occur due to many reasons, such as the size of the welding seam is not accurate enough, the number of welding seams does not meet the predetermined standard, there is a large error between the welding position and the design position, the welding material The thermophysical properties 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 to achieve the desired effect.
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2021-09-15
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