The surface quality inspection of ship plates in the steel industry is an important link to ensure the quality and safety of ship construction. Ship plate is one of the most important materials in ship construction, and its surface quality directly affects the safety and service life of the ship. Therefore, it is very important to carry out quality inspection on the surface of the ship plate. This article will introduce several aspects of surface quality inspection of ship plates in the steel industry in detail.
1. Appearance inspection
Visual inspection is one of the most basic methods of evaluating the surface quality of ship decks. It mainly uses visual inspection to evaluate whether there are cracks, depressions, scars and other defects on the surface of the ship plate. This evaluation method is simple and easy to implement, but it can only initially judge the quality of the surface of the ship plate, and cannot find tiny defects.
2. Magnetic particle testing and ultrasonic testing
Magnetic particle inspection and ultrasonic inspection are commonly used non-destructive inspection methods, which can detect whether there are defects and cracks inside the ship plate. Magnetic particle testing is to sprinkle magnetic particles on the surface of the ship plate, and then use a magnetic field to detect the position and quantity of these particles, so as to determine whether there are cracks and defects in the ship plate. Ultrasonic flaw detection uses the principle of ultrasonic reflection to detect the internal structure of the ship plate, and can detect very small defects and cracks.
3. Penetration testing
Penetrant testing is mainly used to detect corrosion on the surface of ship plates. It utilizes the characteristics of the diffusion of certain chemical substances in different media, by applying a certain chemical agent, and then observing the degree of diffusion to judge whether there is a corrosion problem on the surface of the ship plate.
4. Electropolishing
Electropolishing is an efficient surface treatment method, which can make the surface of the ship plate reach a certain degree of finish and smoothness, and improve the quality of the surface of the ship plate. This method introduces electric current into the aqueous solution, so that the metal ions in the solution are reduced to metal and deposited on the surface of the ship plate, so that the surface of the ship plate becomes smooth and even.
5. Chemical Composition Analysis
Chemical composition analysis is mainly to evaluate the quality of ship plate samples by analyzing their chemical composition. This can help identify potential problems and improve quality control during production. For example, if a certain alloying element is found to be low or high, it may be necessary to adjust the production process or select a different material.
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