Research of Introducing the Quality Management System of Automobile Producing—Task the Spot Welding Quality of High Strength Steel Sheets for Automobile AsExample

• Main Authors: Shui-Hsin Lo, 羅水興
• Other Authors: Shy-Der Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/76207929020989850012

碩士 === 中原大學 === 企業管理研究所 === 97 === To global automakers, steel sheets’ higher ability to endure crash is needed to increase the quality and security of the automobiles. Meanwhile, to respond to the policy of diminishing CO2 emission and to reduce gasoline consumption by lightening the body of cars, applying high strength steel sheets to panel beating has become a trend. The lightest auto body research focuses on the new materials, malleability, and joining skills. Because there are still many challenges in spot quality and skills that should be conquered, spot producing process is the joining skill which is the most widely used. The domestic automakers have already applied the high strength steel sheets panel beating to developing new car styles and so as this case company. Different from common auto steel sheets, the spot welding conditions of the high strength steel sheets include electricity, power-on time, tip pressing, tip diameter and etc. To secure the quality of the high strength steel sheets’ spot welding, it’s important to know the interaction between the high strength steel sheets and spot welding. To deeply study the impact of the traits of high strength steel sheets and the changes of welding conditions on the quality and strength of spot, it’s important to study the related skills of welding which is to decrease the failed spot and increase the qualification rate by improving the quality management and ultrasonic wave detection. This research uses individual research methods of field and field empirical and adopts Joule’s law according to the Spot Welding principle. It also analyzes the resistance of the panel beating of high strength steel sheets, the changes of the tip diameter, and the changes of tip pressing. In addition, this research uses the test steel, the ultrasonic wave detection, and quality management to analyze the spot’s quality of high strength steel sheets in order to find out the most suitable welding conditions of high strength steel sheets. This research is going to test with the real auto. First, count the amount of the combination of the panel beating, and produce different test steels of high strength steel sheets and ordinary steel sheets. There comes out 242 kinds of combination of the panel beating. Then, adopt the most appropriate welding conditions of the high strength steel sheets and conduct spot welding. Finally, detect the panel beating under ultrasonic wave detection. According to the result of the research, this case company can work out the best regulations of welding conditions and quality management for high strength steel sheets, and apply them to our automobiles.