Welding Quality Control Of Body-In-White

China's automobile industry from scratch, from small to large, developed into a complete industrial system. From the early-1950s to the mid-80s, mainly produced the truck. In the 20th century until the late 80s began producing cars. The real development of automobile industry will increase to 20 years time. During these 20 years of automobile manufacturing process, the body manufacturing technology in China's automobile industry has always been the weakest link. At the same time manufacturing technology of the body is the vehicle manufacturing technology in an important part. A car plant product is actually out of the body. Body mass is good or bad, a direct impact on vehicle assembly of precision parts. Therefore, the emphasis on vehicle technology research and development process as a body the necessary staff work and tasks.This article is to explore the white body of the welding quality problems, so painting is not within the scope of this research. Stamping is the plate material processing into a different shape forming parts, is decentralized, independent, must be assembled to become the body welding, so welding is the key to the body as a whole forming process. Therefore, the welding process Welding manufacturing process is an important part of the body. This article focuses on the body of the welding process to study and elaborate body welding quality control principles and methods.In the second chapter in this paper, the impact of body welding quality stampings and RPS for discussion and research. First of all requests for product design: Product design quality to the product's inherent quality. Body affecting the accuracy of '2 mm 'concept of explanation. If the body match the precision of exceeding the prescribed value, will affect the body manufacture welding quality, producing beats and product costs. For the press, the car body's first working operation, the second chapter introduced the pressing common confectioning principle and specialty, and the pressing equipment in common use.This paper investigated and analyzed the pressing parts'related joint matching relationship in the new car's productive preparation, constituted the parts'related joint principle, method and process. That was the premises for guaranteeing the body's welding, used'the same hole'method and special body's welding verifying instruments to find out the parts'deviation, declare the parts'correction target, and regulate the body's welding fixture, that could satisfy the body's precision requirement, and supply the prerequisite for the body's welding quality.The third chapter discussed the prophase programming moment of welding technology, including: the welding line's system constitution, technology constitution, equipment constitution and the mostly function, configuration fashion, the line's layout fundamental which the welding line must have, at the same time introduced the production-line's time, the principle of constituting workshop station. That was basic qualification of the welding technology design, and was also the premises for guaranteeing the body's welding.In laying out the production-line's workshop station, we wouldn't only satisfy the production-line's time requirement, but also satisfied the fabrication technology requirement, that means: satisfying welding precision and welding quality, while reducing the number of workers and final cost. So on the theory calculation basic, we also needed to think about the technology practice, to regulate the planes, and to satisfy the previous three terms. If we wanted to reach this level, our technologists must have enough technology practice and a long time of accumulating process.In the fourth chapter,comprehensive analysis and study spot welding technique , welding equipment and welding parameters have been resolved, affecting the welding quality of the dynamic resistance, current, pressure and welding time, contact area and other parameters the relevant data analysis. From the dynamic resistance curve can be seen, welding current, welding time, pressure, electrode diameter is an important parameter affecting weld quality. In the welding process is not independent of each parameter in the change, often change in a parameter will cause changes in another parameter, while the number of parameters according to certain requirements for each change in different directions, but also different characteristics can be adjusted to obtain different heating effect of the norm, based on these principles and the corresponding test combined with the actual process to develop the relevant experience of welding parameters values.In the fourth chapter also discussed and researched defects generated in the process of welding, weld quality grade standards for solder joint inspection, welding spacing standards, solder joint inspection methods etc. and development of the relevant standards and systems. In this chapter, also on the solder joint inspection of the principles and methods in bad solder joint repair process actually carried out the study and concluded . At the same time highlighting the content of body in white solder joint quality , it is Xiali Corporation to ensure the quality of an important body welding process controls. The quality assurance system, that is, to ensure a reasonable quality costs within the achievement of the quality factors, the functional departments of the best match with the combination to form a welding quality management, closed-loop system to maximize the reduction and elimination of various factors on the welding quality of the impact of efforts to complete the NP and the SP of the target to get the best quality and economic benefitsIn short, with the precision of the body in white to ensure the welding of the body in white for effective quality control, so as to ensure the body's overall weld quality and accuracyIn the fifth chapter, comprehensive summary and review how to control body in white precision and welding quality, and a new type of welding process - Tailored Blanks - now widely used in automotive body design of new technologies, carried out a simple explanation: Tailored Blanks is a new technology which currently the car body design has been widely used, it can be by different surface treatment, different materials, different thickness of steel using laser welding method to make it free combination to be a rough pieces. Tailored Blanks can reduce the component count, reducing component weight, for the production of wide-body car for possible, so that raise product quality and production efficiency, at the same time, you can significantly reduce manufacturing costs, bring tremendous economic benefits for enterprises...