Special attention should be paid to the corrosion of welds in equipment, pipelines, steel structures, etc

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Special attention should be paid to the corrosion of welds in equipment, pipelines, steel structures, etc. Welds are often the weakest parts of such equipment or pipelines. Due to design or welding defects, the welds become a breeding ground for accelerated corrosion. Applying anti-corrosion coatings to equipment and similar items not only enhances their appearance but also extends the service life of steel structural equipment. After some coating works are completed, upon close inspection, one can find many tiny cracks at corners, weld joints, and similar areas; these areas are often easily overlooked. Although it may not seem noticeable, it poses serious safety hazards. This is because corners are usually junctions, and these junctions are subjected to tension from the pipes in the steel structure, bearing stress as a result. Once the corrosion protection at these welds fails and corrosion occurs inside, the supporting parts of the entire steel structure become vulnerable, leading to various dangers. Leakages, spills, drips, and even ruptures during production often occur at welded joints. In minor cases, this leads to system shutdowns and disrupts production; in severe cases, it can result in explosions, causing serious losses to production and the economy, and even resulting in casualties. Such as stainless steel water tanks, which are used to store alkaline groundwater from Inner Mongolia; after being in use for a period of time, the weld areas suffer severe corrosion. For another example, during the actual use of cars, local corrosion often occurs on the vehicle body, especially at the welded joints, where corrosion is even more pronounced. Weld corrosion occurs because the composition of the weld metal is usually different from that of the base material, and the metallurgical conditions of the weld also differ from those of the base material. Moreover, the flatness of the surface at the corners of the welds can also lead to uneven thickness of the paint film formed, or to accumulation of paint, resulting in an overly thick paint film that exceeds the optimal thickness required for that particular paint ； Furthermore, the weld joints are subjected to high tensile stresses, and the tensile strength of the paint itself does not meet the required standards.