Throughout the production process, the process of work running through them. Process design work is not only related to the production type, product structure, technology and equipment, production technology, and even practical experience but also by technology and production management personnel system constraints, any one factor changes, may lead to technological design program changes. So, to say the production process design is the most active business factors, environmental process design depends on its use will inevitably lead to the dynamic process design and empirical. The traditional process design is carried out by hand, and this inevitably some shortcomings of the following:

(1) process design for high staff

The traditional process was designed by the hand to design technologist, process documentation is reasonable, feasible and

Length of time depends on the preparation process to the experience and proficiency. This will inevitably lead to the design cycle process documents and quality assurance is not easy. Therefore, the traditional process design technologist with rich experience in production.

(2) workload, inefficient

Process design need to generate a large number of process documents, process documents more use of these forms, the form of cards. General process planning by hand to go through the following steps: part design by the technology staff by process; completed process card, drawing process, sketches; proofreading; audit; dependents write, trace; blueprint; binding. In addition, the technology staff also summarized a lot of work, such as: tooling summary, summary and other equipment. The work of the heavy workload, the need to take a long time.

(3) can not use CAD, graphics, data

As the State Science and Technology "rejection drawing board project" The implementation of two-dimensional CAD application in the enterprise has been very popular among the various departments to communicate through the digital images, however, is still due process design department to design artificial means, This can not be effective use of CAD, graphics and data.

(4) difficult to ensure the accuracy of the data

Process design to deal with a lot of graphic information, data, information, and process design through a large amount of process documents and process data; traditional design approach requires manual processing graphics and data, due to the variety of data and very scattered, so deal with it cumbersome, easy to error.

(5) information can not be shared

With the deepening of enterprise computer applications, the data generated by various departments through the exchange and sharing of computer data, if the technology sector is still using manual methods, data from other departments can only query by hand, low efficiency and error-prone; the process data generated can not easily communicate with other departments and share.

Currently, computer technology has penetrated into all areas of factories and enterprises, during the design process, such as the application of computer technology in the design department must greatly improve the process efficiency, work quality and improve the information processing capabilities and inter-departmental enterprises information exchange capabilities. Especially after the application of CAPP, the CAPP (Computer Aided Process Planning), it usually refers to machinery parts manufacturing process of computer-aided design and documentation, will shorten the design cycle, design modifications and changes can be made quickly response; process to the experience can be accumulated and inherited the full; reduce the workload of the preparation of technical documents and the possibility of error and to lay the foundation for the establishment of computer manufacturing system [2].

In the past few decades, some researchers have been using AI and knowledge based systems approach to the design of the Welding Electrodes , has established a number of prototype systems. Expert system knowledge and experience of human experts to form the knowledge base into the computer, and imitate human experts to solve problems and thought processes, use of such knowledge and experience of the problems of reality to make judgments and decisions. Expert system can use the knowledge in knowledge guide experimental design, numerical simulation, the interpretation of results, select and recommend a reasonable initial value optimization method, so as to reduce the number of trials or the number of iterations to improve the optimization accuracy and reduce costs. Instead, test and simulation and optimization results and to further enrich the knowledge of the expert system to make it more powerful [12].

Based on the above considerations, the use of Microsoft Access to produce this "welding technology and defects of the database system." Although it is not real CAPP system, but it is a small software, can provide a general process design in many important knowledge that allows technology workers from the tedious repetition of the routine work, freeing the preparation of a complete and rapid detailed engineering documents, shorten production preparation cycle, improve product manufacturing quality, and thereby shorten the product development cycle. Fundamentally change the process from the design of the 'individual' work with 'manual' labor nature of the process design to improve quality, and reasonable working hours for the development of advanced fixed, to provide a scientific basis for improving business management; realize the standardization process, standardization and optimization .

keywords: Carbon Steel Welding Rod