毕业设计（论文）--毕业设计论文-不锈钢与铜焊接工艺及金相分析_精品.doc

毕业设计（论文）--毕业设计论文-不锈钢与铜焊接工艺及金相分析 摘 要为异种材料铜和钢的焊接提供理论基础和试验基础不锈钢及铜中含有合金元素 和杂质 在焊接过程中易形成各种低熔点共晶体和脆性化合物严重削弱了金属在高温时的晶间结合力由于铜导热系数比不锈钢大得多需采用大功率热源因此热影响区宽使接头承受较大应力焊缝易产生热裂纹近缝区不锈钢一侧易产生渗透裂纹其原因是由液态铜对钢有渗透作用和拉应力造成的通过焊接检验可知焊缝具有良好的性能经金相检验焊缝内部组织均匀紫铜和紫铜熔合区过渡均匀结合良好紫铜与碳钢熔合线平直无孔洞且Cu和Fe相互之间有一定程度扩散熔合区为冶金结合 紫铜钢 金相分析Abstract This paper studies in copper and stainless steel welding technology Namely dissimilar material of welding technology research for the dissimilar materials copper and stainless steel welding to provide the theoretical foundation and experimental basis The mainly welding processec is tungsten inert gas arc welding TIG welding Stainless steel and copper alloy containing elements Ni Si V and impurities O S P in the welding process in the formation of low-melting-eutectic and brittle compounds severely weakening the metal in the temperature of crystallization binding force thermal conductivity of copper due to greater than stainless steel to use high-power heat the heat-affected zone width the larger joints under stress thermal weld cracks easily seam zone near the side of easy to produce stainless steel Crack infiltration which is caused by the liquid steel with copper on infiltration and the tensile stress Through welding inspection we can see that Weld has a good performance the metallographic examination the internal organization of uniform weld copper and copper fusion zone transition uniform with good copper and steel fusion line is straight no holes and the Cu and Fe to a certain extent between the spread of fusion zone for the metallurgical combine Key words copper stainless steel welding technology metallographic analysis 目录 摘 要 I Abstract II 第1章 绪 论 1 11课题研究的目的及意义 1 12不锈钢铜的焊接性分析 1 13 铜和不锈钢在国内外的发展现状 5 com 铜及其合金材料在国内外的发展现状及应用领域 5 com 不锈钢材料在国内外的发展现状及应用领域 5 14 异种金属材料焊接存在的技术问题及缺陷 6 15 本章的主要研究内容 7 第2章 实验方法设备与材料 8 21 引言 8 22 试材料选择 8 23 焊接方法及设备的选择 9 com 焊接方法的选择及工艺 9 com 实验设备的选择 14 24 本章总结 15 第3章 实验结果及分析 16 31 焊接接头金相组织分析内容 16 32 试验结果及分析