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在研制接管和法兰不锈钢堆焊设备过程中,所选用的几种焊接变位机结合合理,操作灵活、方便、可靠,能满足不同规格接管和法兰内壁、法兰面及端部R处的不锈钢堆焊工艺要求。通过焊接工艺试验所选用的堆焊方法及堆焊材料合理,并达到了不锈钢堆焊耐蚀层的含碳量不大于0.02%的要求。各项检验结果均满足产品技术条件和堆焊质量要求。 相似文献
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碳钢接管内壁堆焊耐蚀层是中厚壁复合板压力容器最常用的接管结构形式,该形式具有小直径接管内壁堆焊空间受限、大直径接管内壁堆焊面积大的特点。文中以某项目不锈钢复合板三相分离器的20MnMoNb钢接管内壁不锈钢耐蚀层堆焊为例,根据管内径尺寸和堆焊效率选用TIG或FCAW自动堆焊方法,对基材20MnMoNb锻件进行焊接性分析,通过焊接工艺评定试验,制订合理的TIG/FCAW自动堆焊焊接工艺和过程质量控制措施,获得了良好的耐蚀层堆焊质量,满足了接管的力学性能及耐蚀要求。 相似文献
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压力容器接管法兰密封面或管板密封槽内常堆焊不锈钢耐蚀层,以增加其耐蚀性。本文论述了用药芯焊丝CO2保护焊配用合理的焊接辅机实现了不锈钢层水平位置的自动堆焊,从而提高了堆焊质量,降低了生产成本,通过工艺评定证明:所选用的堆焊方法及堆焊工艺合理,各项性能检验结果均满足有关加氢设备技术条件要求 相似文献
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某变换气分离器设备上小口径厚壁接管内壁需堆焊一层5mm厚的OCr18Ni10Ti复合材料作耐蚀层,由于接管直径小,一般的焊接工艺不能满足产品的技术要求。本文采用自制工装和工艺环引弧,并选择焊条电弧焊进行多层堆焊,焊后堆焊层性能完全达到技术要求,为公司生产同类设备的堆焊技术提供了可靠的参考依据。 相似文献
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根据内壁堆焊不锈钢层的复合法兰加工中出现的堆焊变形问题及毛坯超声波探伤技术要求,提出了较传统的圆环毛坯更经济的仿形毛坯和柱颈毛坯,并针对仿形毛坯提出了四种事前预防变形措施和一种事后变形矫正措施,比较了各种方法的优缺点,实践效果显著且成本低廉。 相似文献
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扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性. 相似文献
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论述了CAD技术中参数化设计的三种建模方法,重点介绍了基于特征的参数化建模原理。在此基础上,分析机械设计中的机构结构,归纳出其零件的几何特征构成。设计了机构CAD图形库,并提出了该图形库生成步骤和人机交互界面。 相似文献
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采用激光辐照对FeCrAlW电弧喷涂层的组织进行致密化处理,借助扫描电镜和X衍射对涂层的组织进行了分析.测试了涂层的显微硬度.结果表明:涂层组织致密度提高,孔隙率明显降低.随着激光扫描速度的增加,涂层的显微硬度降低.在较低的扫描速度下,涂层与基体之间形成互熔区,涂层与基体之间产生良好的冶金结合. 相似文献
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C. Colinet 《Intermetallics》2003,11(11-12):1095
A large number of ab-initio calculations of energies of formation of intermetallic compounds have been performed in the last 15 years. The currently used methods are listed. The paper presents a review of the aluminium based compounds which have been studied. Comparisons of calculated and experimental enthalpies of formation are provided for aluminim-3d and-4d transition metal alloys at equiatomic composition. The modelling of the enthalpies of mixing of solid solutions based on a given lattice is described. 相似文献
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O. N. Vlasova N. N. Korneeva V. I. Eremenko O. Kh. Fatkullin N. M. Semenova S. N. Petrova D. D. Vaulin 《Metal Science and Heat Treatment》1991,33(12):924-931
Conclusions To provide a high level of mechanical properties in wrought blanks of cast ÉP741NP and ÉP962 alloys it is necessary to form controlled structures. A necklace-type structure formed in homogenizing isostatic treatment, subsequent thermomechanical working including alternation of the operations of deformation in the (+)-area and recrystallization anneals, and final heat treatment is preferable. The temperature conditions of all stages of thermomechanical working are strictly controlled, especially the final operation of deformation and heating for hardening. To eliminate hardening cracks and distortions it is necessary to use molten salts at t=600°C as quenchants. The use of multiple production operations makes it possible to significantly reduce the structural inhomogeneity related to inhertance of the original dendritic structure. However, the structure of the final semifinished product is nevertheless characterized by a difference in occurrence of the processes of polygonization and recrystallization between the former dendritic cells and the interdendritic spaces in deformation and heat treatment.To obtain structurally homogeneous blanks for gas turbine engine parts it is necessary to use basically new methods of remelting such as vacuum double electrode remelting and electron beam remelting with an intermediate vessel.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 25–29, December, 1991. 相似文献