CAJ | 학술논문

通过金相试验、夏比冲击试验研究了X70螺旋埋弧焊管焊接接头热影响区试样不同缺口位置的金相组织、冲击功及剪切面积的分布情况。试验结果显示，冲击功和剪切面积的大小与缺口位置在粗晶区、细晶区、部分相变区和内焊缝所占的比例相关，内焊缝所占比例越低，冲击功和剪切面积越大。综合分析试验结果和相关标准，得出了X70焊管焊接接头热影响区试样缺口位置的确定方法，即热影响区冲击试样的缺口轴线应在试样上表面与外焊缝熔合线交界处，冲击试样边缘距外焊缝边缘1～2 mm为宜。
통과금상시험、하비충격시험연구료X70라선매호한관한접접두열영향구시양불동결구위치적금상조직、충격공급전절면적적분포정황。시험결과현시，충격공화전절면적적대소여결구위치재조정구、세정구、부분상변구화내한봉소점적비례상관，내한봉소점비례월저，충격공화전절면적월대。종합분석시험결과화상관표준，득출료X70한관한접접두열영향구시양결구위치적학정방법，즉열영향구충격시양적결구축선응재시양상표면여외한봉용합선교계처，충격시양변연거외한봉변연1～2 mm위의。
In this article, it studied the distribution situation of metallographic structure, impact energy and shearing area of X70 SAWH pipe welded joint HAZ specimen in different Notch position, by adopting metallographic test and Charpy impact test. The results indicated that the values of impact energy value and shearing area are related with Notch position proportion in coarse grained region, fine grained region, part of the phase change zone and inside weld. The lower the proportion of inside weld is, the greater the impact energy and shearing area. After comprehensive analysis of test results and related standards, the determination method of X70 SAWH pipe welded joint HAZ specimen Notch position was obtained; the Notch axis of HAZ impact specimen should be in the junction of specimen upper surface and outside weld fusion line, and the distance from Impact test specimen edges to the outside weld edge of 1~2 mm is applicable.