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基于等离子穿孔型弧焊(K-PAW)的焊缝成形结构特点,通过对多种不同的热源作用模式进行比较,获得了适合K-PAW焊接成形工艺的体积热源组合式作用模式。把组合式模式应用到K-PAW焊接成形热过程中的SYSWELD软件有限元数值模拟分析中,计算了不锈钢K-PAW焊接工艺中的温度场及成形焊缝的结构尺寸大小,结果表明了所采用热源模式的准确性。 相似文献
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文中基于SYSWELD有限元分析软件对Q345/316L异种钢焊接过程的瞬态温度分布、残余应力及变形进行了数值模拟,并通过试验对其模拟结果进行了验证. 试验测量结果与数值模拟结果吻合良好,证明了利用SYSWELD模拟异种钢焊接的可靠性. 结果表明,异种钢焊接温度场呈不对称分布,Q345侧的高温区域范围更大. 不论是横向残余应力还是纵向残余应力,沿焊缝方向均呈帽状分布且在焊缝中部位置存在最大残余应力;在垂直于焊缝中央截面上,纵向残余应力与横向残余应力在焊缝和焊缝附近区域分布是不连续的,存在较大的应力梯度且应力状态也较复杂,而最大残余应力出现在Q345侧的熔合线处. 不同的热输入下模拟结果表明,在保证焊接接头质量的前提下,最好采用小热输入的焊接工艺. 相似文献
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GIS铝合金壳体主要以焊接成形,有一定的装配精度要求。若焊接变形和残余应力较为严重,会影响产品的质量。为了研究焊接过程对产品质量的影响,以法兰与筒体焊接为对象,通过有限元软件SYSWELD模拟出焊接过程的温度场及应力场,得到热循环曲线、变形及残余应力分布。结果表明,第一道焊缝多次加热,且峰值温度接近退火温度;法兰存在整体倾斜及表面不平整的变形,筒体呈现波浪状变形;残余应力主要分布在第一道焊缝根部及整个第二道焊缝。模拟结果可以为GIS铝合金壳体焊接工艺控制提供参考依据。 相似文献
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连续油管管-管对接焊概述 总被引:1,自引:0,他引:1
在介绍连续油管(CT)材料发展的基础上,分析了CT现场管-管对接焊的技术需求和关键技术,讨论了CT管-管对接接头的性能要求,介绍了CT对接焊的国内外发展现状,提出了CT管-管对接焊技术的研究方向. 相似文献
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Separation functionals are computed for a class of manufactured object that include cylindrical and rectangular artifacts, bored tubes and parallel surfaces with variable diameter. The perfect forms applied in this analysis are spatial tubes generated from planar regular and convex polygons. The construction of the tube separation functional involves the computation of an “inner envelope” which is functionally dependent on several parameters. The inner envelope is a new construction which allows the visualization of the separation functional for a three-dimensional symmetrical artifact. Examples are used to illustrate the separation functionals associated with various manufactured artifacts. 相似文献
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简述了5454热挤压管在碳铵生产企业碳化水箱上的应用,分析了RE(稀土)在5454合金中的作用,通过对比试验评价了5454热挤压管与1060冷拉管的耐冲刷磨损性、耐腐蚀性及冷弯曲加工性。 相似文献
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Matthias Kleiner Matthias Hermes Michael Weber Herbert Olivier Grygoriy Gershteyn Friedrich-Wilhelm Bach Alexander Brosius 《Production Engineering》2007,1(1):9-17
The expansion of tubes by direct application of gas detonation waves is an alternative forming method for hollow section workpieces.
In particular the process can be used for typical hydroforming parts, for example car body or exhaust elements in automotive
industry. The gas charge of oxygen and hydrogen is both pressure medium and energy source and has the potential to cause high
forming velocities. The introduced process belongs to the category of high speed forming methods and provides typical advantages
such as higher achievable strains compared to quasi-static methods using high water pressure. Another advantage of this process
is the avoidance of high press forces by application of an “inertia-locked tool” system due to the extremely short process
time. To develop a controllable process, good knowledge of the interdependencies in the system “medium, workpiece and tool”
is essential. This can be achieved using simulations in combination with experimental investigations. The results are topic
of this paper, also including special investigations on the material behavior at high strain rates and temperature gradients.
This paper is based on investigations within the scope of a research project in the Priority Program SPP 1180, which is kindly
supported by the German Research Foundation (DFG). The investigations were carried out by cooperation of: University of Dortmund,
Institute of Forming Technology and Light-weight Construction; RWTH Aachen University, Shock Wave Laboratory; University of
Hanover, Institute of Materials Science. 相似文献