What problems are likely to occur in the construction of steel structure workshop?

1. Welding process of steel structure workshop

This process is a concealed project and one of the processes most prone to quality problems. The weld repair rate caused by welding quality is as high as 80%, followed by about 10% of the weld quality problems caused by improper operation of the previous process and technical problems of the operators, which are the main problems directly affecting the project quality. Therefore, this type of problem can only be detected and judged by a professional testing company using professional testing tools. Generally, it can be divided into slag inclusion, non fusion, porosity, etc. according to the type of defects in the weld.

2. Coating process of steel structure workshop

This process is also a concealed process, which has less impact on the structure than on the building function. It is also a process prone to quality problems.

The quality problems of the process are mainly shown in: the paint film on the surface of steel structure workshop components falls off in large areas and locally, and the paint film on the surface of components falls off, causing sagging. The thickness of the paint film is not enough, the thickness distribution of the paint film is uneven, and the color difference of the paint film is large.

3. Setting out and blanking process of steel structure workshop

This process belongs to the leader before component processing, and its quality has a direct impact on the next process, even leading to the scrapping of all parts and components. This situation is very common, so it is very important and necessary to strengthen the quality control of the process before blanking.

The quality problems caused by this process are mainly shown in that the long and thin plate parts are severely deformed during cutting. The depth of horse tooth mark, nodule and cut mark on the cutting surface caused by cutting gas or slag inclusion in the plate and uneven distribution of components exceeds the standard. The dimension of parts and components cut by gas cutting or sawing does not exceed the standard due to the shrinkage deformation of subsequent processes. Batch parts scrapped due to errors in the preparation of process documents. The size of blanking and cutting seriously exceeds the standard requirements.

4. Assembly process of steel structure workshop

This process plays an important role in the quality of steel structure workshop component processing, and its quality is greatly affected by the previous process, so it is very important to strengthen the process monitoring before assembly.

The quality problems arising from this process are mainly shown in the wrong position of the assembled parts, such as 3450mm to 4350mm. The use of parts is wrong. 2 # parts should have been assembled, but 3 # other parts were assembled. The parts were assembled incorrectly at the correct position, such as the 45mm hole on the plate was originally outward, but actually 45mm was installed inward. The assembly clearance of assembled parts exceeds the requirements of specifications and technical documents, with a clearance of 3mm and 7mm. Some parts are assembled without correction, and the existing deformation after assembly cannot be eliminated. The operator cut without permission for the sake of drawing, causing the hole size on the part to exceed the standard. No surface treatment was carried out in the assembly and welding area. Assembly error due to wrong drawing size.