I. During the manufacturing of steel components, the processing technology should be determined in combination with the actual supply varieties of materials, processing technology level and equipment conditions, etc., to reduce the stress and deformation of the components.

 

　　1) Minimize the types of steel and the number of component types to prevent component stress and deformation.

 

　　2) The dimensions or hole diameters of symmetrical parts should be unified as much as possible for easy mechanical processing; and it is beneficial to the interchangeability during assembly.

 

　　3) Reasonably arrange weld seams, avoid the distance between weld seams being too close, when the length dimension of the material is greater than the length dimension of the part, try to reduce or not do splicing weld seams; the weld seam arrangement should be symmetrical to the center of gravity of the component or both sides of the axial symmetry to reduce welding stress concentration and welding deformation.

 

　　4) When connecting parts and components, avoid connecting with unequal sections and unequal thicknesses; when connecting, the shape and thickness of the section should be changed in a gentle slope form, so that the section or thickness at the butt joint is equal, to achieve smooth and even force transmission, which can prevent excessive stress and increased deformation after welding.

 

　　5) The end shape of the welded plane of the component should not be sharp to avoid the heat concentration in the welding area, and the large stress and deformation at the connection.

 

　　6) The distance between the edges of each node and each member end of the steel structure component should not be too close, generally the offset distance should not be less than 20mm, to ensure welding quality, avoid heat concentration during welding, increase stress, and increase the degree of deformation.

 

　　7) The processing equipment used for on-site manufacturing of steel components should meet the construction quality requirements.

 

　　II. The selection of welding machines should ensure the stability of welding current and voltage, and the load usage, and meet the welding requirements of different structures and various position welds.

 

　　① AC welding machines are suitable for welding ordinary steel components.

 

　　② DC welding machines are suitable for welding steel components with higher requirements.

 

　　③ Buried arc automatic welding is suitable for welding long butt or fillet welds such as beams and columns in steel components.

 

　　④ CO2 gas shielded welding is suitable for welding of thin steel plate structures with higher requirements.

 

　　The layout platform and assembly platform used for the manufacturing of steel components should have a standard horizontal plane, especially the assembly platform before and after the auxiliary setting and use, must be measured by the wire pulling method or instrument, if the local unevenness can be adjusted with shims, the local unevenness error should be controlled within 2~3mm. This can prevent local bending during the assembly of components; the support rigidity of the platform should ensure that the components do not lose stability or sink under the pressure of their own weight, to ensure the horizontality of the assembled components.