Steel structure sandwich project is to make full use of effective space to increase the effective use of the area of ​​the best programs, more and more enterprises, families, plant steel structure of the sandwich way to effectively change the housing structure and increase the use of area. Steel structure sandwich project has also been more and more customer awareness, recognition. Then the steel structure in the construction process of sandwich quality should be how to control, how to do steel mezzanine works? We should know, only the strict control of the steel structure is the work of the mezzanine and each process need to check the items in order to create a fine steel mezzanine works.
Qingyuan Steel Structure

1. Welding process design
Determine the welding method, welding parameters and electrode, wire, flux specifications and other models.
2. Spot welding
Welding structure in the splicing, assembly to determine the exact location of parts, first to locate the spot welding. The length and thickness of spot welding shall be determined by calculation. Current than the formal welding increased by 10% to 15%, positioning the location of spot welding should try to avoid the end of the component, the corner where the stress concentration.
3. Electrode baking
Welding electrodes and flux-cored wire must be baked according to quality requirements before use, low-hydrogen electrode after baking, should be placed in the incubator with the use of the take.
4 preheating before welding
Preheating can reduce the heat-affected zone cooling rate, prevention of welding delay crack generation. Preheat zone on both sides of the weld, each side width should be greater than 1.5 times the weldment thickness, and should not be less than 100mm.
5. Post-weld heat treatment
Postweld heat treatment is mainly on the weld dehydrogenation treatment to prevent the generation of cold cracks. After heat treatment should be carried out immediately after welding, insulation time should be based on the thickness of each plate 25mm thickness determined 1h. Preheat and after the heat can be used for flame guns.
6. Determine the welding sequence
Generally weld from the center of the expansion to the surrounding; first welding shrinkage of large welds, welding shrinkage after welding; symmetrical welding; weld intersection, the first welding longitudinal weld, to be cooled to room temperature, And then welding horizontal welding seam; steel plate thicker when welding.

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