Surface-mounting technology is a systematic project. The technology is intensive in surface assembly and large-scale production. The equipment investment is large and the technical difficulty is high. Due to the high quality of the equipment itself, high precision guarantees the system, high precision, and automatic line running. Under normal circumstances, the equipment failure rate is very low, but the system is not well adjusted, the operation is improper, the power supply is not normal, the production environment is not good, and the process connection is not good, which will lead to an increase in equipment failure rate.

In actual production, there is good equipment in time, but due to improper process, the product is replaced, the welding furnace temperature curve is not replaced in time, which often leads to increased welding defects. The storage conditions of components, PCB, solder paste and patch glue are not standardized. , can lead to poor solderability of components. Welding defects occur for a number of reasons.

The ISO9000 series of standards was developed by the International Organization for Standardization in Geneva, Switzerland, in 1987 to further improve the international standards for quality management of manufacturers. This standard is revised every five years and re-released.

In the ISO9000 standard, the quality management system clearly proposes twenty elements and the criteria that these elements should meet. The best part of the twenty elements is called: the human-machine law loop. It has practical operability and continuity of inheritance and development.

SMT production has high quality requirements and is difficult to process. This is rare in other industries. He is closely connected with many industrial factories, various components, auxiliary materials, solder paste, patch adhesive, PCB, and process. Method, processing equipment purchased parts, and external parts, product designers need the knowledge of this profession, but also must be familiar with SMT process specifications; welding quality continues to guarantee the equipment, but also can not be separated from human experience, a little mistake This can lead to quality accidents, especially in the event of welding quality problems, the possibility of recovery and repair is very small.