New and old welding technologies have been used, seen and heard.

【Summary Description】 The installation of chemical equipment is a key step before the production of chemical equipment. Welding technology directly affects the performance of the equipment. Most of the operating environment of chemical equipment is relatively harsh. Therefore, welding is of great significance to the manufacture and use of chemical equipment. The following is a summary of various welding technologies. New welding process and new technology 1 Welding robot The outstanding performance of welding technology progress is the development of welding process from mechanization to automation, intelligence and information. The application of intelligent welding robot is an important symbol of high automation of welding process. Welding robot breaks through the traditional way of welding automation and makes it possible to produce small batch automation. Most of the welding robots are arm-type machines with fixed positions, which are taught and intelligent. Teaching robot: through teaching, memory welding trajectory and welding parameters, and in strict accordance with the teaching program to complete the welding of products. With only one teaching, the robot can accurately reproduce each step of the teaching. This kind of welding robot is widely used, suitable for mass production, used in the fixed station of the assembly line, its function is mainly to teach reproduction, the strain capacity of environmental changes is poor. There is no use for small batch production of large structures on the construction site. Intelligent robot: It can automatically determine the starting point, space trajectory and related parameters of the weld according to simple control instructions, and can automatically track the weld trajectory, adjust the welding torch posture, adjust the welding parameters and control the welding quality according to the actual situation. This is the most advanced welding robot, with smart, lightweight, easy to move and other characteristics, can adapt to different structures, different locations of the welding task, the current practical application is very few, is still in the research and development stage. In welding robots, spot welding robots account for 50% ~ 60%, which consists of three parts: robot body, spot welding system and control system. The degree of freedom of the robot body is 1~5, and the control system is divided into body control and welding part control. The welding system mainly includes: welding controller, welding tongs and auxiliary parts such as water and electricity (underwater welding). 2 Application of computer software The application of computer software system in the field of welding mainly has the following aspects: 1. Computer simulation technology includes simulation of welding thermal process, welding metallurgical process, welding stress and deformation. Welding is a complex process involving arc physics, heat transfer, metallurgy and mechanics. Once the various processes in welding have been computer simulated, the computer system can be used to determine the best design, process and welding parameters for welding various structures and materials. Traditionally, the welding process is always determined through a series of experiments or based on experience, in order to obtain a reliable and economical welding structure, computer simulation as long as a small number of verification tests to prove the applicability of numerical methods in dealing with a problem, a large number of screening work can be completed by the computer, save a lot of test work, thus greatly saving manpower, material resources and time, it is of great significance in the welding of new engineering structures and new materials. The level of computer simulation technology also determines the scope of automated welding. In addition, computer simulation is also widely used to analyze the strength and performance of welded structures and joints. 2. Database technology and expert system are used for welding process design and selection of process parameters, welding defect diagnosis, welding cost budget, real-time monitoring, welding CAD, welder examination, etc. Database technology has penetrated into all aspects of the welding field, from raw materials, welding test, welding process to welding production. Typical database systems include welding procedure qualification, welding procedure specification, welder file management, Welding materials, material composition and performance, weldability, welding CCT diagram management and welding standard consulting system. These database systems provide favorable conditions for various data and information management in the welding field. Welding expert system mainly focuses on process formulation, defect prediction and diagnosis, computer-aided design and so on. In the existing welding expert system, process selection and process formulation are the most important application fields, and the real-time control of welding process is an important development direction. 3. Computer-aided quality control (CAQ) technology is used for product data analysis, real-time monitoring of welding quality, etc. In addition, computer-aided design/manufacturing (CAD/CAM) is increasingly used in Welding processing, mainly for CNC cutting, welding structure design and welding robots.

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