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首页> 外文会议>ASME international pipeline conference;IPC2010 >MECHANICAL PROPERTIES AND MICROSTRUCTURE OF WELD METAL AND HAZ REGIONS IN X100 SINGLE AND DUAL TORCH GIRTH WELDS
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MECHANICAL PROPERTIES AND MICROSTRUCTURE OF WELD METAL AND HAZ REGIONS IN X100 SINGLE AND DUAL TORCH GIRTH WELDS

机译：X100单焊炬环和双焊炬环的焊接金属和热影响区的力学性能和显微组织

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The main objectives of the current study were to further develop tensile and toughness testing protocols and to provide a better understanding of the factors that control both weld metal and HAZ microstructure and properties in pipeline girth welds. In this investigation, two series of rolled (1G) girth welds were made in X100 pipe of 36 in. diameter and 0.750 in. wall thickness using two pulsed-gas metal arc welding process variants: single and dual torch. The small-scale testing program included evaluations of all-weld-metal tensile strength, Charpy impact and standard fracture toughness measured by single-edge bend SE(B) tests, along with preliminary fracture toughness results using a single-edge tension SE(T) test developed at CANMET. Additional information was obtained from detailed microstructural characterizations of weld metal and HAZ regions along with microhardness testing.All-weld-metal tensile tests using round and strip tensile specimens showed variations with through-thickness location and in some case with clock position. Full stress-strain curves were generated, and 0.2% offset yield strength, flow stress, ultimate tensile strength, and uniform strain were measured and compared with pipe properties using calculated weld strength mismatch factors based on these properties.Charpy V-notch transition curves were generated for both weld metal and HAZ (notched within 0.5 mm of the fusion line). Fracture toughness of both weld metal and HAZ regions of single torch welds was assessed using standard SE(B)testing procedures with Bx2B preferred specimens notched through-thickness at the weld centerline and in the HAZ (within 0.5 mm of the fusion line). Full J-resistance curves were measured using SE(T) tests of surface-notched WM and HAZ specimens; the SE(T) test was designed to match the constraint of full-size pipeline girth welds.
机译：当前研究的主要目标是进一步开发拉伸和韧性测试协议，并更好地理解控制环缝焊缝中控制焊接金属和热影响区组织和性能的因素。在这项研究中，使用两个脉冲气体金属电弧焊工艺变体：单焊枪和双焊枪，在直径为36英寸，壁厚为0.750英寸的X100管中进行了两个系列的轧制（1G）环缝焊接。小型测试程序包括通过单边弯曲SE（B）测试测量的全焊接金属拉伸强度，夏比冲击和标准断裂韧性的评估，以及使用单边拉伸SE（T）的初步断裂韧性结果）在CANMET开发的测试。从焊缝金属和HAZ区域的详细显微组织特征以及显微硬度测试中获得了更多信息。 使用圆形和带状拉伸试样进行的全焊接金属拉伸试验显示，贯穿厚度位置以及在某些情况下随时钟位置的变化。生成了完整的应力-应变曲线，并测量了0.2％的偏移屈服强度，流动应力，极限抗拉强度和均匀应变，并使用基于这些特性的计算得出的焊接强度失配因子与管道特性进行了比较。 焊缝金属和热影响区均产生了夏比V型缺口过渡曲线（缺口在融合线的0.5毫米内）。使用标准SE（B）评估单焊炬焊缝的焊接金属和HAZ区域的断裂韧性 Bx2B的最佳测试程序是在焊接中心线和热影响区（在融合线的0.5毫米以内）在厚度上开有缺口的试样。使用表面有缺口的WM和HAZ标本的SE（T）测试测量了完整的J电阻曲线; SE（T）测试旨在匹配全尺寸管道环缝焊缝的约束条件。

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