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汽车用双相钢板电阻点焊工艺研究
Research on Resistance Spot Welding Performance of Automotive Dual-phase Steel
【作者】 陈军；
【导师】 于燕；
【作者基本信息】 长春工业大学 ， 材料加工工程， 2011， 硕士
【摘要】 双相钢具有屈服点低、初始加工硬化率高、强度高、延性好等特点,在汽车制造领域得到了广泛应用。在先进高强材料中,双相钢已经成为车身制造中应用前景最广泛的一种新型材料。使用双相钢钢板可以减轻汽车(尤其是轿车)钢结构件自重的20%左右。在汽车工业生产中电阻点焊是主要的钢板连接方法,目前电阻点焊是车身制造中最重要的连接工艺,完成车身装配工作量的90%以上,电阻点焊质量好坏将会直接影响整车的性能。双相钢钢板的电阻点焊应用的技术研究与开发,对当今世界节约资源、降低能耗和可持续发展具有十分重要的现实意义。本课题主要目的是对800、1000MPa级双相钢的电阻点焊工艺进行研究与探讨,通过对两种冷轧双相钢板进行力学性能的测定以及其电阻点焊工艺试验,并对双相钢钢板的点焊性能进行了分析和讨论。主要工作内容如下：(1)对DP800, Doco1800DP高强度双相钢进行电阻点焊工艺的试验,对国产双相钢的焊后进行金相分析、显微硬度、剪切试验以及扫描断口分析,确定最佳点焊工艺参数。(2)对DP1000高强度双相钢进行电阻点焊工艺的试验,进行国产双相钢的点焊金相分析、显微硬度、剪切试验以及扫描断口分析,确定最佳工艺条件,从而确定一定的电阻点焊工艺参数。
【Abstract】 Dual-phase steel have been widely used in the automotive industry as a solution for lower yield point, higher initial hardening rate, high strength, good ductility and other characteristics. In the advanced high-strength materials, Dual-phase steel has become the most extensive application prospect of a new body manufacture material. It can reduce the weight of steel structure about 20%, especially for cars. Resistance spot welding (RSW) is the dominant sheet metal joining method in automobile industry. Resistance spot welding (RSW) has great importance to automobile industry for it accomplishes about 90% of car body assembly. Resistance spot welding quality will directly affect the quality of the performance of vehicle。Resistance spot welding Dual-phase steel plate applied technology research and development, conservation of resources in today’s world, reducing energy consumption and sustainable development is of great practical significance.The main purpose of this project is to design and make 800MPa, 1000MPa level Dual-phase steel of Resistance spot welding performance, through the determination of mechanical properties and its spot welding process test, and make lot of analysis and discussion for two level dual-phase steel. This paper mainly relates how to improve weld ability of 800 and 1000MPa level dual-phase steel by Resistance spot welding(RSW).The main development works are as follows:(1)The properties of application for resistance spot welding of 800MPa-level dual-phase steel were researched. The made dual-phase steel on the domestic spot welding was studied by metallographic analysis, micro-hardness, tensile shear tests and scanning fracture analysis. From the result we can make the optimum conditions and to determine a certain optimization resistance welding process parameters.(2)The properties of application for resistance spot welding of 1000MPa-level dual-phase steel were researched. The made dual-phase steel on the domestic spot welding was studied by metallographic analysis, micro-hardness, shear tests and scanning fracture analysis. From the result we can make the optimum conditions and to determine a certain optimization resistance welding process parameters.