共查询到20条相似文献,搜索用时 78 毫秒
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电站管道中的焊接接头,大多数为对接接头,通过手工超声检测方法在实际中的应用,说明检测参数K值的变化及如何判别相应的伪缺陷现象。 相似文献
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《稀有金属材料与工程》2004,21(5):37-40
通过对不同直径、压力、温度组合下的钛制容器不同的焊接接头系数所造成的生产成本大小的详细分析,旨在说明在选取焊接接头系数时应考虑的一些基本因素,并总结出了几种直径、压力、温度组合下的焊接接头系数选取表。 相似文献
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压力容器破裂的大部分原因是焊接质量低劣。指出了影响焊接质量的因素。论述了焊缝结构设计基础,焊缝应力计算;焊接接头设计中应注意的问题 相似文献
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针对电热管焊接接头挤压产生的裂纹,通过采用金相显微镜观察其金相组织并用直读光谱对原材料成分进行化学成分分析,排除了成分、焊接工艺规范等的影响。经过对挤压过程分析,发现应力集中点是产生裂纹的主要原因,并提出了改进的方法。 相似文献
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《Science & Technology of Welding & Joining》2013,18(8):709-716
AbstractTitanium–steel composite plate finds its application to constructing large pressure vessels normally used for storage and processing petrochemicals. The present study aims to calculate the stress–strain distributions in different types of welding joints possibly used in a pressure vessel which is built with a TA2/16MnR composite plate. A finite element numerical investigation has been preformed. In this work, influences on stress–strain distributions caused by various factors such as work temperatures, working loads and joint structures, were studied, taking into consideration the welding residual stress caused by the welding process. It is found that working temperatures are the main factors that would cause a great effect on the final stress distribution. As to the different types of welding joints, the stress peaks and distributions present various patterns due to the different structures of the joints. Based on the simulation result, suitable welded joint types under different working conditions are proposed. 相似文献
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This study focuses on the opening mode of induction bends; this mode represents the deformation outside a bend. Bending experiments on induction bends are shown and the manner of failure of these bends was investigated. Ruptures occur at the intrados of the bends, which undergo tensile stress, and accompany the local reduction in wall thickness, i.e. necking that indicates strain localization. By implementing finite element analysis (FEA), it was shown that the rupture is dominated not by the fracture criterion of material but by the initiation of strain localization that is a deformation characteristic of the material. These ruptures are due to the rapid increase in local strain after the initiation of strain localization and suddenly reach the fracture criterion. For the evaluation of the deformability of the bends, a method based on FEA that can predict the displacement at the rupture is proposed. We show that the yield surface shape and the true stress–strain relationship after uniform elongation have to be defined on the basis of the actual properties of the bend material. The von Mises yield criterion, which is commonly used in cases of elastic–plastic FEA, could not predict the rupture and overestimated the deformability. In contrast, a yield surface obtained by performing tensile tests on a biaxial specimen could predict the rupture. The prediction of the rupture was accomplished by an inverse calibration method that determined the true stress–strain relationship after uniform elongation. 相似文献
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动力工程及工程热物理学科以过程工艺原理、先进装备技术和现代控制技术为基础,培养本领域从事设计、制造、研究、开发和管理等工作的高级专业技术人才。焊接技术是先进装备制造技术的基础,也是先进装备服役及老化管理最值得关注的技术之一。基于此,浙江工业大学动力工程及工程热物理学科在国内率先开设了承压设备焊接工程与理论研究生课程,使学生掌握承压设备焊接的基本概念、规律及技术,并能利用这些基本理论解决复杂工程实际问题。 相似文献