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Analysis of Bending Distortion During Manual Metal Arc Welding of Pipes using Finite Element Method

机译:管道手工金属电弧焊过程中弯曲变形的有限元分析

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摘要

Distortion is an inevitable after effect of welding and distortion control in long welded members has to be tackled in the shop floor through the adoption of a suitable technique. During the manual metal arc welding of long members, a higher level of distortion is faced as compared to that faced in automatic welding because of reheating at the various start and stop locations. The present paper aims at comparative study of the thermal cycles, distortion and residual stresses in a long welded pipe during automatic welding and manual metal arc welding. The absence of quasi stationary condition in manual welding results in a different pattern of transient distortion. The final steady state distortion is higher in manual welding compared to automatic welding. The residual stresses are also higher in the restart region in manual welding compared to the mid section location. The finite element model employed, the welding conditions analysed and the thermal, displacement and residual stress results are presented in this paper.
机译:变形是焊接效果不可避免的结果,必须通过采用适当的技术来解决长焊接构件中变形控制的问题。与在自动焊接中所面临的变形相比,在长构件的手动金属电弧焊期间,由于在各个开始和停止位置处的重新加热,所面临的变形程度更高。本文旨在对长焊管在自动焊接和手工金属电弧焊过程中的热循环,变形和残余应力进行比较研究。手工焊接中没有准静止状态会导致瞬态变形的不同模式。与自动焊接相比,手动焊接的最终稳态变形更高。与中间部分位置相比,手动焊接在重新启动区域中的残余应力也更高。本文介绍了所使用的有限元模型,分析了焊接条件以及热,位移和残余应力结果。

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