小型化气体发生器壳体的激光焊接技术研究

发布时间：2018-03-18 22:23

本文选题：气体发生器　切入点：汽车安全气囊　出处：《电子科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着中国经济的快速发展,作为中国经济支柱之一的汽车工业也得到了持续的发展。2009年,中国汽车产量和销量双双冲破1000万辆大关,首次跃居世界第一。汽车的行驶环境复杂、汽车保有量的增加、公路运输繁忙、车辆构成复杂以及交通管理法规有待完善等多种因素,都更容易引发交通事故,汽车事故不断增加,交通安全形势十分严峻,汽车安全问题日益凸显。社会的进步促使人们以人为本的意识在不断增强,因此,人们越来越重视汽车的安全性。汽车安全气囊造价低、使用方便、效果显著,能有效减轻交通事故对乘员的伤害,是现代汽车被动安全的主要保护措施之一,发挥着越来越重要的作用,具有广阔的市场前景。气体发生器是汽车安全气囊的核心部件,对汽车安全气囊的保护性能起着举足轻重的作用。为满足安全气囊小型化发展趋势的需要,四川华川工业公司研发了小型化气体发生器。气体发生器壳体联结的激光焊接技术是发生器制造的核心技术。激光焊接过程极其复杂,受多种因素影响,并且各因素之间又存在相互作用。而且,小型化气体发生器壳体激光焊接的余量更小,要求更高。因此,为了保证激光焊接的可靠性,有必要对气体发生器壳体激光焊接技术进行研究。本文研究工作主要包括:(1)研究了大功率激光焊接的机理。首先,分析了气体发生器壳体联结选用激光焊接的必要性。其次,深入研究了激光焊接原理、激光焊接的两种作用机理、激光焊接过程检测以及焊后焊缝检测等相关技术理论,并找出影响焊接质量的主要因素。(2)选取了影响激光焊接效果最重要的两个焊接参数激光功率和焊接速度,研究了激光功率、焊接速度两个焊接工艺参数对气体发生器壳体焊接熔深和水破压力的影响。根据气体发生器壳体焊接的需求,以壳体水破压力试验为手段,选取激光功率和焊接速度进行试验研究,获得气体发生器壳体焊接参数的焊接图,并应用于小型化气体发生器产品的焊接。(3)由于目前还没有直观、高效的气体发生器壳体激光焊接质量检测技术,为高效、可靠地控制小型化气体发生器壳体的激光焊接质量,建立了完整的质量过程控制模式,可用于指导生产实际。
[Abstract]:With the rapid development of China's economy, the automobile industry, one of the mainstays of the Chinese economy, has also been continuously developed. In 2009, China's car production and sales both broke through the 10 million vehicle threshold, and for the first time became the largest in the world. The increase in vehicle ownership, the busy road transportation, the complex composition of vehicles and the need to improve traffic management laws and regulations are all more likely to lead to traffic accidents, which are constantly increasing, and the traffic safety situation is very serious. The problem of automobile safety is becoming more and more prominent. The progress of society urges people to be more and more conscious of people-oriented. Therefore, people pay more and more attention to the safety of automobile. The cost of automobile airbag is low, the use is convenient, and the effect is remarkable. It is one of the main protective measures for the passive safety of modern automobile, which can effectively reduce the injury caused by traffic accidents to the occupants. It plays an increasingly important role and has a broad market prospect. The gas generator is the core component of the automobile safety airbag. In order to meet the need of the development trend of airbag miniaturization, Sichuan Huachuan Industrial Company has developed a miniaturized gas generator. The laser welding technology connected with the shell of the gas generator is the core technology of the generator manufacture. The laser welding process is extremely complex and affected by many factors. Moreover, the allowance of laser welding of miniaturized gas generator shell is smaller and the requirement is higher. Therefore, in order to ensure the reliability of laser welding, It is necessary to study the laser welding technology of gas generator shell. The research work in this paper mainly includes: 1) the mechanism of high power laser welding is studied. Firstly, the necessity of selecting laser welding for gas generator shell is analyzed. The theory of laser welding, the two mechanisms of laser welding, the detection of laser welding process and the inspection of welding seam after welding are deeply studied. Find out the main factors that affect the welding quality. (2) choose the two most important welding parameters, laser power and welding speed, and study the laser power. The influence of two welding process parameters of welding speed on the welding penetration and water breaking pressure of the gas generator shell. According to the welding requirements of the gas generator shell, the water breaking pressure test of the gas generator shell is taken as the means. Laser power and welding speed are selected to study the welding parameters of the gas generator shell, and applied to the welding of miniaturized gas generator. In order to control the laser welding quality of miniaturized gas generator shell efficiently and reliably, a complete quality process control mode is established, which can be used to guide the production practice.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG456.7

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