The steel grating is affected by some parts of the high temperature heat source. During the welding process of the steel grating, the weld area is intensely heated and partially melted by some high-temperature heat sources. During cooling, the material shortening in the welding area is affected by the uneven temperature field in the surrounding area, forming an uneven shortening deformation, the welding area shows tensile residual stress, and the adjacent area is subject to compressive residual stress. Stainless steel plate welding is very sensitive to the input of heat source. Reasonable control of the input heat source energy is of great significance to the quality of steel plate weldments. Entering large heat source energies can cause large shortening deformations. On the contrary, smaller heat source energy results in smaller shortening deformation. Therefore, in order to ensure the welding shape, the input heat source should be selected as small as possible. Affected by the roughness and thickness of the plate, the roughness and defects of the weld surface will cause the critical buckling deformation of the steel grid to a certain extent. For uneven plates, the addition of residual stress is relatively slow at the initial stage, but when the welding residual stress exceeds a certain value, the addition of plate deflection is relatively fast. The factors affecting the welding deformation of the steel grating are not isolated, and the irregular welding deformation is the result of the combined action of various factors. Therefore, it is necessary to find reasonable measures in the process of production and design to reduce welding deformation. According to the application conditions of the steel grating (bearing value and device span), select the steel grating type from the "Safe Load Load and Span and Deflection Contact Table". Planning requirements for the walkway: When the steel grating path bears the planned load, its deformation deflection cannot be greater than 1/00 of the span, and the walkway cannot exceed 10mm. In addition to meeting the above requirements, all paths should meet the following rules, when the planned load value X1 .5, the steel grating will not produce permanent deformation, and when the planned load value X3.0, the steel grating will not crack. , under the planned load conditions, the deformation deflection at the midpoint of any step cannot be greater than 1/200 of its span, and cannot exceed 6 mm. In addition to meeting the above requirements, all treads should also meet the following rules: When the planned load value X1.5 When the steel grating will not produce permanent deformation, and when the planned load value X3.0, the steel grating will not produce cracks.
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