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Selection and Application of Structural Steel Materials for Aircraft Maintenance Hangars​

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 Aircraft maintenance hangars , as the core facilities for aircraft inspection and repair operations, must endure long-term exposure to large-span loads, extreme weather conditions, and complex operational environments. Consequently, stringent requirements are imposed on the strength, weather resistance, and stability of the structural steel materials employed. The judicious selection of suitable steel structural materials not only ensures the hangar's safe operation but also reduces construction and maintenance costs. Based on the functional requirements of different structural components within the hangar, commonly used steel structural materials can be categorised into three main types, each playing a critical role in hangar construction. I. Primary Load-Bearing Structure: The Core Material Supporting the Hangar's ‘Skeleton’ The primary load-bearing structure forms the hangar's ‘skeleton’, bearing the hangar's own weight, aircraft parking loads, and external forces s...
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Quality control of space frame processing

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 The quality control of the space frame processing process is mainly reflected in the following aspects:

1. Special technical disclosure. Before each type of component grid processing, the project must be disclosed: grid processing quantity, completion time and requirements, acceptance standards, problems to be paid attention to in construction, technical assurance measures, protection measures for finished products and semi-finished products, possible accidents and measures, welding by material and welding process parameters, welding sequence, etc.

2. Measurement control. Measurement control runs through the whole process of grid processing, from the inspection of material size, cutting size inspection, component group deviation, component welding Angle size, correction deviation control, pre-assembly size, drilling aperture, paint film thickness and so on. In order to ensure the accuracy of measuring instruments, the use, storage, maintenance and inspection of measuring instruments are required to be carried out in accordance with the provisions.



3, cutting and cutting stage quality control. The quality inspection personnel first obtains the cutting sheet from the technical personnel, and reviews the size and material of the cutting sheet according to the construction drawings. If there is any mistake, it will be fed back to the technical person in charge for scrapping. Secondly, it is to check the actual drawing size, size and material of the construction team after cutting; If it is not correct, it will be fed back to the person in charge of cutting, redrawing the line and cutting the material. Finally, check whether the cutting size is correct according to the allowable deviation of the technical disclosure, and fill in the record.

4, H-shaped steel group stage. Wrong side control: t/10, and not more than 2 mm, ￡is the thickness of the steel plate. Section size control: including height, perpendicularity, center shift. The verticality control of the flange plate to the web plate: b/100, and not more than 2mm, 6 is the width of the H-shaped steel flange. Group on gap control, etc.

H-shaped steel parts splicing requirements, flange plate splicing seam and web joint spacing should not be less than 200mm, flange plate splicing length should not be less than 2 times the width of the plate, web splicing should not be less than 300mm, the width direction is best not splicing.

5, welding stage. Including weld root cleaning inspection (for penetration weld), weld appearance inspection, weld size inspection.

6. Correct cutting. Calibration stage is mainly verticality, distortion detection, qualified into the next process cutting.

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What are the differences between bolted ball grids and welded ball grids?

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