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Quality control of second-hand steel structures

In recent years, people have become increasingly concerned about environmental protection and sustainable development, so second-hand steel structures have gradually gained people's favor. However, regarding second-hand steel structures, there are often some quality issues during use, which require strict quality control. This article will explore how to control the quality of second-hand steel structures from the aspects of data selection, inspection, welding process, etc.

1、 Data selection

When selecting iron sheet materials, the main consideration should be whether there is rust or significant corrosion on the surface. Together, it is also necessary to check whether the thickness of the iron sheet data meets the planning requirements and pay attention to any variations in thickness.

When inspecting welding rods, it is important to pay attention to whether there are any defects in the welding rods. If the appearance of the welding rod shows bending or fracture, it should be thoroughly inspected and any quality issues found should be addressed.

When selecting second-hand steel pipes, attention should be paid to checking their appearance for rust and corrosion, and to paying attention to whether the wall thickness of the steel pipes meets the planning requirements.

2、 Inspection and testing

For an experienced construction team, the quality of second-hand steel is often guaranteed. However, in order to avoid quality issues, strict testing and inspection are also necessary. Mainly including the following aspects:

Quality inspection of welded joints: In the quality inspection of welded joints, it is necessary to measure the size of the joints according to the planning drawings, and check whether the internal structure of the welded joints is firm, complete, and free from defects such as pores and undercuts.

Steel surface quality inspection requires different inspection methods for different steel raw materials when inspecting the surface quality of steel. For materials such as angle steel, it is necessary to check whether their edges are sharp and whether their straightness meets the specifications; Regarding materials such as steel pipes, it is necessary to inspect their surfaces for significant rust and corrosion.

The tensile performance experiment involves conducting tensile performance experiments on welded steel, which is also a necessary step for controlling the quality of second-hand steel structures. In the experiment, the strength of welding joints should be tested according to the planning requirements, and any welding joints that do not meet the requirements should be treated.

3、 Welding process

When welding second-hand steel structures, appropriate welding processes and materials need to be used. Generally speaking, arc welding, gas welding, submerged arc welding and other methods are common. These welding methods can be selected based on specific situations in practical applications.

During the welding process, the following points should also be noted:

The pre-treatment of steel needs to be thorough and thoughtful to avoid affecting the subsequent welding quality;

Before welding, data inspection should be conducted to ensure that its quality meets the planning requirements;

Strictly follow the welding process regulations to ensure that the welding quality meets the specifications;

Conduct inspections and experiments on the welded steel structure to check whether the quality of the welded joints meets the planning requirements.

Overall, second-hand steel structures require comprehensive quality control during use. Only through strict testing and standardized welding processes can we ensure a stable amount of steel raw materials and effective construction quality.