With the increasing maturity of digital technology, the digital welding machine and digital control technology of dynamic grounding technology of representative office have steadily entered the market. The Three Gorges project, West to east gas transmission project, aerospace project, shipbuilding project and other national large-scale basic projects have effectively promoted the development and progress of advanced welding, especially welding automation technology. The manufacturing of automobile and parts requires the automation of welding with each passing day. China's welding industry is gradually moving towards "high efficiency, automation and intelligence". The welding automation rate in China is less than 30%, which is far from 80% in developed industrial countries. Since the end of the 20th century, the country has gradually promoted the basic welding method of automatic welding - gas shielded welding to replace the traditional manual arc welding, which has achieved initial results. It can be predicted that in the future, domestic automatic welding technology will develop at an unprecedented speed.
Current situation of high efficiency and automatic welding technology
In the 1990s, China's welding industry took the realization of mechanization and automation of welding process as a strategic goal, which has been implemented in the scientific and technological development of various industries. In the development of welding production automation, research and development of welding production line and flexible manufacturing technology, and development and application of computer-aided design and manufacturing; Among them, the growth rate of flux cored wire is significantly increased, which will exceed that of solid cored wire in the next 20 years, and will eventually become the leading product of the welding center.
Prospect of welding automation technology
The development of electronic technology, computer microelectronics and automation technology promotes the development of welding automation technology. In particular, the introduction of unit technology such as numerical control technology, flexible manufacturing technology and information processing technology has promoted the revolutionary development of welding automation technology.
(1) The intellectualization of welding process control system is one of the core problems of welding automation, and it is also an important research direction in the future. Research on optimal control methods should be carried out, including linear and various nonlinear controls. The most representative are the fuzzy control, neural network control and expert system of welding process.
(2) Welding flexibility technology is also the focus of research. In the future research, various optical, mechanical and electrical technologies will be organically combined with welding technology to realize the accuracy and flexibility of welding. The fundamental way to improve the level of welding automation is to transform the traditional welding process equipment with microelectronic technology. It is a current research direction to combine numerical control technology with all kinds of welding machinery and equipment to improve its flexibility level; In addition, the combination of welding robot and expert system to realize the functions of automatic path planning, automatic correction of trajectory and automatic control of penetration is the focus of research.
(3) The integration of welding control system is the integration of human and technology and the integration of welding technology and information technology. Information flow and material flow are important components of integrated system. Promoting their organic combination can greatly reduce the amount of information and the requirements of real-time control. Attention should be paid to giving full play to people's response and judgment ability in control and on-the-spot processing, establishing a friendly man-machine interface, and making people and the automatic system harmonious and unified, which are the factors that can not be underestimated in the integrated system.
(4) Improving the reliability, quality stability and control of welding power supply, as well as excellent dynamic performance, is also an important research topic. Develop a high-performance welding machine that can adjust arc motion, wire feeding and welding gun attitude, detect weld slope beginning, temperature field, molten pool state and penetration, timely provide welding specification parameters, and actively develop computer simulation technology of welding process. The evolution of welding technology from "skill" to "science" is an important aspect of realizing welding automation. The first decade of this century will be a favorable period for the rapid development of the welding industry. Our welding workers have a heavy task and a long way to go. We must establish the determination to overcome difficulties. Seize the opportunity and strive for the improvement of welding automation level in China.
