Figure 3 The function and structure of the WCAPP system The WCAPP system provides three ways to process the process: 5 body welding quality information management system The car body is a complex profiled shell that is machined from hundreds of sheet metal stampings. Effectively organize and automate the management of a large number of discrete quality data of the body welding process, real-time and accurate reflection of the quality of the (white) body production, and provide technical and management personnel with means to analyze quality problems, which can effectively shorten the fault response time. To enhance the scientific nature of quality management. Figure 4 Overall structure of the body welding quality information management system Based on the database modeling and design, the body welding quality information management system developed by Tsinghua University uses computer and network technology to realize the network management of welding process, quality inspection, statistical process control and diagnosis, and report output. Its overall structure is shown in Figure 4, including the following main functions: Figure 5 SPC control control chart Development Trend of welding engineering application software <br> <br> fuzzy theory, the rise of new technology of artificial intelligence and neural networks such as object-oriented injected new vitality into the development of welding engineering applications. The development of network and multimedia technology puts higher and higher requirements on the intelligence of welding engineering application software. Previous page INA roller bearings,INA needle roller bearings,INA joint bearing,INA full roller bearing,INA thrust needle roller bearings Shanghai Yi Kai Cheng bearing Co., LTD , https://www.ykchbearing.com
1) Directly extract the standard process flow of typical parts from the standard process flow chart of typical parts. When formulating the processing process, the system first queries whether there is a standard process in the standard process library that matches the part number and the part to be formulated, and if so, directly extracts.
2) Automatic generation of processing process according to the process rules The process rule library specifies the process generation rules for sheet metal parts, profile parts and components. When the system does not search for the parts to be formulated in the standard process library, a human-computer interaction interface is provided, and the necessary feature information is input (selected) by the user, and the system automatically generates the processing process through the process rules.
3) Manually fill in by the craftsman When the welding parts do not exist in the standard process library of the typical parts, and do not meet the conditions for process formulation using the process rules, the system provides the method of manually filling out the process cards by the craftsman.
In addition, Tsinghua University and Xuzhou Engineering Machinery Factory jointly developed the RAWCAPP system for engineering machinery welding, and realized the process document management and process management based on product structure tree with the idea of ​​PDM while realizing the welding process planning of welded structural parts. User/role/version management and integration with CAD and MRPII systems and information exchange. The system adopts different process development modes for the structural characteristics of the front frame, rear frame and pressure wheel of the main welded structural parts of the road roller, such as similar process method, typical process method and process template method, etc. The derivation function, combined with the creation and generalization features, enables users to choose according to the actual situation. 
1) Preparation, addition, deletion, modification and report printing output of inspection process and standards;
2) Verify the input and management of measured data;
3) Statistical analysis of production quality data and generation and printout of statistical reports;
4) Automatic drawing and printout of histograms, arrangement diagrams, etc.;
5) Real-time monitoring and trend forecasting of body welding quality using statistical process control (SPC) technology;
6) Using statistical process diagnosis (SPD) technology to achieve the search and analysis of the causes of quality failures;
Process quality statistical analysis and process control and diagnosis are prevention-based quality prediction and control methods. It uses statistical means to analyze and evaluate process production quality and take corresponding measures to achieve the goal of quality control. The quality statistical methods are divided into two categories. One is the static state of the reaction quality data in a certain period of time, which is called simple statistical analysis, such as histogram and arrangement chart. The other is a dynamic method that reflects the law of quality data over time, that is, the statistical process control SPC based on the control chart and the statistical process diagnosis SPD. Figure 5 shows the implementation interface of the control chart for SPC control. 
Based on the current status and dynamics of information technology and artificial intelligence technology, the development trend of welding application software can be summarized as follows:
1) Strengthening of existing applied research and expansion of new application areas;
2) Application research and development technology of new artificial intelligence technology in welding application software;
3) Make full use of network technology to realize distributed processing and collaborative work of welding application software;
4) Using multimedia technology to realize the intelligent and anthropomorphic human-machine interface of welding application software;
5) Develop versatile welding application software and its development tools.