【作者】 郭晓娟；

【导师】 杨新岐；

【作者基本信息】 天津大学 ， 材料加工工程， 2007， 硕士

【摘要】 搅拌摩擦焊(FSW)作为一种固相焊接技术在铝及其合金的焊接方面显示出了巨大的优势。搅拌摩擦焊温度场的分析是深入研究各种工艺参数、焊接缺陷、组织结构和组织性能的前提。本文主要采用ANSYS有限元软件模拟分析搅拌摩擦焊中温度场的分布及特点。在所建立的搅拌摩擦焊的热输入模型中,采用了动态坐标系,将坐标系建立在移动的搅拌头上。并且提出了假定的焊接条件和边界条件,针对三种不同的接触条件进行分析,还结合实际焊接条件给出了热输入功率的计算公式。本文最重要的内容就是搅拌摩擦焊中热过程的模拟分析。本文模拟分析了LY12和7075两种薄板铝合金和LD10厚板铝合金的搅拌摩擦焊温度场。在两种薄板铝合金的模拟分析中,从摩擦系数不变和摩擦系数随温度变化两种情况对铝合金搅拌摩擦焊的温度场分布进行分析。对于LD10厚板铝合金采用摩擦系数不变的条件对焊接温度场进行分析。得到了焊接工件上不同位置,不同节点以及不同时间的温度变化曲线,从中总结出了铝合金搅拌摩擦焊温度场的变化规律。其中着重分析了7075薄板铝合金和LD10厚板铝合金焊接接头的组织结构,分析各个不同区域组织结构与温度场分布之间的关系,来验证搅拌摩擦焊温度场的准确性。异种板焊接是搅拌摩擦焊研究中的新课题,结合实际的焊接情况和要求,本文研究了异种板的搅拌摩擦焊,并且模拟分析了异种板搅拌摩擦焊的热过程。本文从两种不同铝合金板的搅拌摩擦焊和铝基合金与钢材之间的搅拌摩擦焊两种情况分析异种板焊接的温度场分布,提出了不同于同种板焊接的热输入模型和边界条件,得出了异种板焊接特殊的温度场分布形式。而且还对铝基合金与钢材的搅拌摩擦焊接头进行详细的描述,对比实际焊接情况对其组织结构和形式进行分析,很好的验证了搅拌摩擦焊焊接异种金属材料的优越性。根据本文的详细描述和分析验证,采用搅拌摩擦焊工艺焊接铝合金和异种金属的焊接都可以得到很好的接头质量,并且从焊接温度场的分析中可以为搅拌摩擦焊工艺的确定和发展提供理论依据。更多还原

【Abstract】 Friction stir welding (FSW) has a large of advertise in the alloy aluminum welding as a solid welding technology. The temperature field simulation is the premise to analysis the various parameters, welding defects, microstructure and performances.This article is mainly simulate and analysis the temperature distribution and characteristics of FSW using ANSYS. And I am establish the friction stir welding heat input model, useing the dynamic coordinate system with the tools. In light of actual conditions, I assumpt the welding conditions and boundary conditions,and give the welding heat input power formulas.An important aspect of this paper is FSW thermal process simulation and alalysis. In the paper, I simulate the FSW temperature field on the LY12 and 7075 two sheets of aluminum and aluminum alloy plate LD10. In the both alloy sheets simulation analysis, the paper is analysis frome the friction coefficient is not changed and its changed with the temperature. LD10 aluminum alloy plate is using the unchanged coefficient of friction welding conditions of temperature field for analysis. We can reach the different location, different nodes and different time temperature curve and concluded the laws. I focus on an analysis of 7075 sheets of aluminum and plate LD10 welded joints of the organizational structure, obvercise the various regional organizations structure and temperature distribution of the relations.Dissimilar plate welding is new issues in FSW. In light of the actual situation and the welding requirements, I give the dissimilar plate welding using friction stir welding in the paper. I simulate and analysis of mutant hot plate welding process. This paper analysis of the differences species plate temperature distribution in order to two different aluminum alloy plate and aluminum alloy and steel products. At the same time, I give the welding heat input model and boundary condituons different form the same plate welding, and come to the plate welding dissimilar special temperature distribution. Similarly, I also give the detailed description to the aluminum and steel of friction stir welding about the joint organizational structure and form. We can see the good test of friction stir welding of dissimilar metals superiority.According to this paper, we can know using the friction stir welding technology to weld the aluminum alloy and dissimilar wetals can get very good quality of the weld joint. We also get the identification and development of theory about friction stir welding process from the welding temperature field analysis.更多还原