Thermal power forging is an important component in thermal power generation equipment, its quality and performance directly affect the safety and efficiency of thermal power generation equipment. As one of the key technologies in the manufacturing process of thermal power forgings, welding technology is of great significance to improve the quality and performance of thermal power forgings. This paper will start with the welding technology of thermal power forging, and discuss its research and application.
The manufacturing of thermal power forgings mainly includes forging, heat treatment and other links. Forging refers to the processing method of deforming metal materials by applying external forces to obtain the desired shape and properties. In the forging process, the structure and properties of the material will change to some extent, so it is necessary to strictly control the forging process. Heat treatment refers to the processing method of changing the organizational structure of metal materials by means of heating, insulation and cooling to obtain the required properties. In the manufacture of thermal power forgings, the main purpose of heat treatment is to eliminate the internal stress generated in the forging process, improve the cutting performance of the material and improve the strength of the material.
Welding technology is also widely used in the manufacture of thermal power forgings. Welding refers to the processing method by heating, pressurizing or combining both, so that two or more metal workpieces produce interatomic bonding and form an inseparable whole. Welding technology has the advantages of good connection effect, high production efficiency and material saving, so it has been widely used in the manufacture of thermal power forgings.
The basic principle of welding technology is to melt the surface of two metal workpieces by heating, and then under pressure or no pressure, so that they penetrate and diffuse each other, forming a combination between metals. According to the different heat sources and process methods used in the welding process, welding technology can be divided into manual welding, TIG welding, MIG welding and other different types.
Manual welding refers to a welding method in which the welding rod or wire is operated by the welder and the welding process is controlled manually. Manual welding has the advantages of simple equipment and flexible operation, but the welding quality is greatly affected by the technical level of welders.
TIG Welding (TIG Inert Gas Welding) is a welding method using Tungsten electrodes and inert gas protection. During the welding process, the tungsten electrode generates an arc to melt the surface of the workpiece, while the inert gas is emitted from the welding gun to form a protected area to prevent the harmful effect of air on the melted metal. TIG welding has the advantages of high weld quality and suitable for various metal materials, but the welding speed is slow.
MIG Welding (Metal Inert Gas Welding) is a welding method that uses wire and inert gas protection. During the welding process, the welding wire is fed through the welding gun, while the inert gas is ejected from the welding gun to form a protected area. MIG welding has the advantages of fast welding speed and high weld quality, and is suitable for welding various metal materials.
In the manufacturing of thermal power forgings, the commonly used welding techniques include manual welding, TIG welding and MIG welding. The following describes the application of these welding technologies in the manufacture of thermal power forgings.
Manual welding is mainly used in the manufacture of thermal power forgings to repair and join smaller parts. Due to the flexibility and convenience of manual welding, it still has certain advantages in some specific occasions. However, due to the high requirements of manual welding on the technical level of welders, it is necessary to strengthen the training and management of welders in practical applications.
TIG welding is mainly used to connect large parts and key parts in thermal power forging manufacturing. Because of the high quality of TIG welding welds, it has been widely used in some important situations. For example, in the manufacturing of thermal forgings, TIG welding can be used to connect key components such as the blades and discs of steam turbines. In addition, TIG welding can also be used to repair worn or damaged parts, improving the reliability and life of the equipment.
MIG welding is also widely used in the manufacture of thermal power forgings. Due to the high welding speed and high weld quality of MIG welding, it is suitable for mass production occasions. In the manufacturing process of thermal power forgings, MIG welding can be used to connect large components and key parts, such as the rotor and journal of the steam turbine. In addition, MIG welding can also be used to manufacture complex geometry and structures, improving the performance and efficiency of equipment.
In the manufacture of thermal power forgings, the quality control of welding technology is of great significance to ensure product quality and safety. The following are some commonly used quality control methods and measures.
Raw material control: strictly control the quality and performance of raw materials to ensure that the metal materials used meet the relevant standards and requirements. For welding materials, the appropriate electrode or wire should be selected and its quality and performance should meet the requirements.
Process control: In the welding process, welding parameters and operation techniques should be strictly controlled to ensure welding quality and stability. At the same time, the training and management of welders should be strengthened to improve their technical level and operational standardization.
Finished product inspection: The finished weld is strictly inspected, including appearance inspection and non-destructive testing, to ensure that the quality and performance of the weld meet the relevant standards and requirements. The unqualified products should be repaired or scrapped in time.
Quality record: Establish a sound quality record system, record and analyze the quality of each process in detail, in order to find and solve problems in time. At the same time, quality records can also be used as the basis for product traceability and quality assessment.
This paper discusses the research and application of welding technology in manufacturing thermal power forgings. By introducing the basic process flow and common welding technology of thermal power forging, the application of different welding technology in thermal power forging is analyzed. At the same time, the importance and methods of welding quality control are emphasized. The purpose of this paper is to deepen the understanding of welding technology in thermal power forging manufacturing, and to provide reference for its optimization and improvement in practical application
