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Bending improvement in Spot Heating of pipes in comparison with Line Heating method

机译：与管线加热法相比，管道点加热的弯曲改善

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摘要

In Spot Heating, a small area of a metal part surface is heated quickly with a gas torch, laser beam, or induction coil to a temperature below the phase change temperature and then cools down. The heated area undergoes compressive plastic strain and the part gets deformed. This method is usually applied as trial and error for straightening shafts, bridge components, ship structures, etc. The conventional straightening mechanism in industries involves creating thermal gradient mechanism (TGM) and shortening. Many studies have been conducted for bending of thin pipes (at a maximum thickness of 2 mm) with the induction of "shortening" by laser. Spot Heating, despite its simplicity, results in very small deformations. The present study aims to increase the deformation in the Spot Heating method so as to extend its use in pipe straightening. To meet this goal, the shortening mechanism is developed through a thick pipe wall by optimizing the heating parameters. CFD analysis of flame flow is carried out to determine the heat flux distribution over the pipe surface. Also, the finite element method and optimization are used to analyze and raise the pipe deformation mechanism. The results indicate a considerable increase in the pipe bending which reduces the stages necessary for the pipe straightening in industries. Furthermore, the appropriate distance for combining the hot spots is also obtained. To evaluate the results, the Spot Heating test is performed, showing appropriate agreement with the simulation results.
机译：在点热量中，用气体炬，激光束或感应线圈快速加热金属部分表面的小面积，以低于相变温度的温度，然后冷却。加热区域经历压缩塑性应变，部分变形。该方法通常用作矫直轴，桥部件，船舶结构等试验和误差。行业中的传统矫直机构涉及产生热梯度机构（TGM）和缩短。已经进行了许多研究，用于弯曲薄管（最大厚度为2mm），激光诱导“缩短”。尽管其简单性，但斑点加热，导致非常小的变形。本研究旨在增加现货加热方法中的变形，以便在管道矫直中延伸其使用。为了满足这一目标，通过优化加热参数，通过厚管壁开发缩短机构。进行了火焰流的CFD分析，以确定管表面上的热通量分布。而且，有限元方法和优化用于分析和提高管变形机制。结果表明管弯曲的相当大的增加，这减少了行业中的管道矫直所需的阶段。此外，还获得了组合热点的适当距离。为了评估结果，进行点热量测试，显示与模拟结果的适当协议。

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