Precautions for welding of steel structure construction

The welder should check the assembly order and surface cleaning quality of the steel structure welding part, and only after passing can the welding be applied. When the groove assembly gap exceeds the allowable deviation regulations, it can be surfacing and grinding on one or both sides of the groove buckle to meet the requirements, but when the groove assembly gap exceeds the thickness of the thin plate by 2 times or greater than 20mm, the overlay welding method should not be used to increase the length of the component. When measuring the centerline of the steel structure box girder, for the allowable deviation range of the centerline, the method of adjusting the ring gap and fine-tuning the beam segment port is used to deal with it, and the centerline excess part is corrected and eliminated. Due to the different forces when splicing at the construction site of the beam section and the matching pre-assembly made by the Liang section factory, it is easy to cause the stitching joint to produce the phenomenon of wrong edges, and the amount of wrong edges exceeds the allowable deviation, which must be corrected and adjusted. When the wind speed in the operation area reaches or exceeds 8m/s during welding, a windproof shelter or other windproof measures should be taken; The relative humidity of the steel structure welding operation area shall not be greater than 90%; When the welding surface is wet or covered with ice and snow, dehumidification and moisture removal measures should be taken. When the ambient temperature of the welding operation area is lower than 0 degrees, the base metal in all directions of the welding area greater than or equal to 2 times the thickness of the steel plate and not less than 100mm should be heated to above 20 °C before welding, and the temperature shall not be lower than this temperature during the welding process. Light steel structure housing is currently the most potential for development of environmental protection and energy-saving housing, in Europe, the United States and Japan and other economically developed countries have been popularized and promoted, it not only replaces the traditional housing model, but also completely uses industrialized production of building materials, set many advantages in one, is the best product of the living environment of human society in the twenty-first century. , 1. Replace traditional red brick and concrete. Steel structure houses break through the traditional construction mode of China's "Qin brick Hanwa" style and are known as the "fourth residential revolution." It has a high degree of industrialization, which is convenient for the formation of a standard building system, and realizes the industrialization of components and the mechanized production of construction. , 2. The energy-saving effect is good, not only higher than that of wood structure houses, but also more than 60% energy saving than brick-concrete houses. When the building service expires and is demolished, all steel structure materials can be recycled. , 3. The steel structure makes residential strength and good wind resistance and seismic performance. Especially in the earthquake area, steel structure houses have overwhelming advantages compared with brick-concrete houses.