Urumqi steel structure

Problems arising from bulk density in steel structure construction in Urumqi

1. Quality problems are more likely to occur during the processing and production process, and it is mainly special processes and important processes that are difficult to deal with after they occur. Generally, the proportion of quality problems occurring in a process is very small. In the above construction process, special processes include welding and painting, and important processes include blanking and assembly.

1. Welding process. This process is a hidden project, and it is also one of the processes that are prone to quality problems. Statistics from a company's product quality report in 2004 show that among the quality problems that occur in this process: the weld repair rate due to welding quality is as high as 80%, followed by weld quality problems caused by improper operation of the previous process and technical problems of the operators, accounting for about 10%. Such problems are the main problems that directly affect the quality of the project. Therefore, this type of problem must be detected and evaluated by a professional testing company using professional testing tools. Generally, according to the type of defects in the weld, they are divided into slag inclusions, lack of fusion, pores, etc.

2. Painting process. This process is also a hidden process, and its impact on the structure is less than the impact on the building function. It is also a process where quality problems are more likely to occur. The Urumqi steel structure manufacturer said that the quality problems of the process are mainly manifested in: large area or partial peeling off of the paint film on the surface of the components, peeling off of the paint film on the surface of the components and sagging, insufficient thickness of the paint film, uneven distribution of the paint film thickness, and large color differences in the paint film.

3. Setting out and cutting process. This process is the first step before component processing. Its quality has a direct impact on the next process, and may even lead to the scrapping of all blanked parts. This situation is very common, so it is very important and necessary to strengthen the quality monitoring of the process before blanking. The Urumqi steel structure manufacturer said that the quality problems caused by this process are mainly manifested in: long and thin plate type parts are severely deformed during cutting; horse teeth appear on the cutting surface due to the cutting gas or the presence of slag inclusions and uneven distribution of ingredients inside the plate. The depth of knots and cuts exceeds the standard; gas-cut or sawed parts do not consider the shrinkage and deformation of subsequent processes, resulting in parts that exceed the standard size; batch parts are scrapped due to errors in the preparation of process documents; the dimensions of blanking and cutting seriously exceed the standard requirements.

4. Assembly process. This process occupies an important position in the quality of component processing, and its quality is greatly affected by the previous process, so it is very important to strengthen process monitoring before assembly. The quality problems caused by this process are mainly manifested in: the wrong position of the assembled parts, such as 3450mm installed into 4350mm; the wrong use of parts, the 2# parts should have been assembled, but the 3# other parts were assembled; the parts were assembled in the correct position, such as the 45mm hole on the board was originally facing outwards, but the 45mm was actually installed facing inward; Urumqi steel structure manufacturer said that the assembly gap of the assembled parts exceeded the requirements of specifications and technical documents, with a gap of 3mm. 7mm; some parts are assembled without correction, and the existing deformation cannot be eliminated after the assembly is completed; the operator cuts the parts privately to save trouble, causing the hole position on the part to exceed the standard size; the mounting and welding area is not surface treated; assembly errors are caused by errors in the dimensions of the drawings.