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首页> 外文会议>PVP-vol.493; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >WELD COOLING-RATES THE ONSET OF FAILURE DURING 'IN-SERVICE' WELDING OF GAS PIPELINES
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WELD COOLING-RATES THE ONSET OF FAILURE DURING 'IN-SERVICE' WELDING OF GAS PIPELINES

机译：气体管道“在用”焊接过程中的焊接冷却速率和故障开始

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摘要

Welding onto a live-gas pipeline (In-service welding or hot-tapping) is employed in the repair, modification or extension of gas pipelines and has significant economic advantages for the gas-transmission industry since it avoids the costs of disrupting pipeline operation and secures continuity of supply; and used in pipeline maintenance such as the installation of sleeves around damaged sections and direct deposition of weld-metal onto an active pipe to replenish wall thickness lost through corrosion or local damage of the gas pipelines. Unfortunately, the flowing gas results in an accelerated cooling of the weld; and secondly, the localized heating and loss of material strength during the welding process, since the pipe-wall may burst under internal pressure if this reduction in strength becomes too critical. The useful role of numerical simulation of 'in-service' welding has been demonstrated by earlier work (i.e. work of EWI & BMI, and Goldak & Others-1992) that applied a general 3D-finite element method to calculate the thermal fields for circumferential fillet and direct-branch welds. Earlier, current authors developed a preliminary burn-through model of 'in-service' welding and in this work the authors have attempted to increase the accuracy of thermal prediction.
机译：在有气管道上进行焊接（在役焊接或热熔）可用于天然气管道的维修，改造或扩建，对气体传输行业具有显着的经济优势，因为它避免了破坏管道运行和维护的成本。确保供应的连续性；并用于管道维护，例如在受损部分周围安装套管，以及将焊接金属直接沉积到活动管道上，以补充由于腐蚀或燃气管道局部损坏而损失的壁厚。不幸的是，流动的气体导致焊缝的加速冷却。第二，焊接过程中的局部加热和材料强度的损失，因为如果强度的降低变得过于严格，则管壁可能会在内部压力下破裂。早期工作（即EWI和BMI以及Goldak＆Others-1992年的工作）已经证明了“在役”焊接数值模拟的有用作用，该工作应用了通用的3D有限元方法来计算圆周热场。角焊和直分支焊。早期，当前的作者开发了“在役”焊接的初步烧穿模型，并且在这项工作中，作者试图提高热预测的准确性。

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