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首页> 外文会议>ASME Pressure Vessels and Piping conference >HRSG-HEADER WELDS RESIDUAL-STRESS EVALUATION AND CREEP-ASSESSMENT THROUGH THE APPLICATION OF ITALIAN CODE, AMERICAN STANDARD
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HRSG-HEADER WELDS RESIDUAL-STRESS EVALUATION AND CREEP-ASSESSMENT THROUGH THE APPLICATION OF ITALIAN CODE, AMERICAN STANDARD

机译：通过使用美国标准，美国标准的HRSG-Header焊接残余应力评估和蠕变评估

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Joint design, preheating, post-weld-heat treatment and operator ability are key factors for the occurrence of critical residual stresses in the welds. In particular, they may affect creep life results of the analysis: to evaluate this, their characterization requires modeling welding process, such as that carried out in the present work for ASTM A 335-Grade P22 weld. It is a weld of the two analyzed in previous work on the high-temperature-section (superheater/reheater) lower headers of the bottom-supported heat-recovery steam generator (HRSG). Present study includes modeling the only weld-lay, gas tungsten arc, manual, for the finned-tube angle joint to the cylinder. It is the same as the first of the three weld-lays for the other previously analyzed, end-plug circumferential "V'-groove butt joint. The material considered for base metal is 2 1/4Cr 1Mo forged, normalized, tempered with creep strain rates higher than the weld's as it appeared from analysis of previous work. Presently, the study first compares max tangential stress evaluated by thermal analysis on the circumferential weld with the average applied normally on the joint, sustained case. Roughly, the latter one has nearly same importance as axial membrane stress on the cylinder wall for the end-plug butt joint, pressure case; it is smaller for the finned-tube angle joint. Then, study compares previous creep results obtained considering SRF = 0.9 for the finned-tube joint weld with those counting the residual-stress increase in stress analysis (different creep law's coefficients). Finally, study compares creep results for the finned-tube joint weld obtained with and without residual-stresses (same creep power-law). The objective is to comprehend residual-stress influence over creep-redistribution and creep relaxation.
机译：接头设计，预热，焊后热处理和操作员的能力是在焊缝中产生临界残余应力的关键因素。特别是，它们可能会影响分析的蠕变寿命结果：要对此进行评估，其表征需要对焊接工艺进行建模，例如本工作中针对ASTM A 335-P22级焊缝进行的焊接工艺。它是先前工作在底部支撑的热回收蒸汽发生器（HRSG）的高温部分（过热器/再热器）下部集管上分析的两种焊缝的结合。目前的研究包括为翅片管与圆柱体的角焊缝建模唯一的手工铺设，钨极气体保护电弧的手册。它与其他先前分析过的，端部插头的周向“ V'型槽对接接头”的三个焊缝中的第一个相同。考虑到的母材材料为2 1 / 4Cr 1Mo锻造，正火并经蠕变回火目前，这项研究首先将通过热分析对周向焊缝评估的最大切向应力与正常情况下在接头处连续施加的平均切向应力进行比较。对于端塞对接接头，在压力情况下，其轴向应力与气缸壁上的轴向膜应力几乎相同;对于翅片管角接头，其较小;然后，研究比较了考虑翅片管的SRF = 0.9之前的蠕变结果接头焊缝与计算应力分析中残余应力增加的焊缝（不同的蠕变定律系数）最后，研究比较了有无残余应力的翅片管接头焊缝的蠕变结果ses（相同的蠕变幂律）。目的是了解残余应力对蠕变再分布和蠕变松弛的影响。

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