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分析了X70级管线钢和P460NH正火钢的焊接性及其相互焊接应注意的问题。提出了大直径厚壁X70钢级钢管与绝缘接头基材P460NH管段在水平固定位置对接焊时,为获得背面成形好、致密性高、含氢量低、综合力学性能较好、接头熔合区无脆硬组织的焊接接头可采用的焊接工艺及相应技术措施。 相似文献
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西气东输二线干线管道工程应用钢管强度等级、管径、壁厚、设计压力、输送量、输送长度和施工周期等综合技术代表了中国管道建设的最高水平。本文分析X80钢的焊接性,并综合考虑西二线的施工特点,制定了西二线的焊接工艺,确保了管道顺利开工和按期投产。 相似文献
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针对采用带铜衬垫的管道气动内对口器进行管道环焊缝根焊(打底焊接)时,对带铜衬垫根焊的焊缝不同位置铜含量进行了测量.为了精确分析渗铜对焊缝力学性能的影响,选用荧光光谱测定仪对焊接试验的焊缝不同位置铜含量进行了精确测量,并通过相关的材料性能试验定性评价了渗铜对焊缝金属力学性能的影响.结果表明,由于受焊接高温影响,铜原子的扩散造成焊缝根焊层铜含量有微量增加.为了评价铜含量增加对焊缝力学性能的影响,还对带铜衬垫的焊缝试件进行了拉伸、冲击和硬度等力学性能试验.结果证明铜含量在一定范围内,并不影响焊缝金属的强度和韧性等力学性能. 相似文献
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The chamber device was designed and set up to simulate the in-service welding. The results show : the t8/5 , t8/3 and inner wall peak temperature Tp decrease with the cooling rate increases. The welding energy is carried off by flowing medium, the cooling rate increases, and many unbalanced microstructures such as granular bainite, martensite and M-A generate ; it worsens the properties of HAZ. Under air-cooling, the cooling rate is slow, the austenite grain grows obviously, the lath ferrite crosses the whole austenite, and it causes the hardness value is also big. The change of HAZ width is not obvious with the increase of cooling rate; and burn-through is not susceptible to the cooling rate. The quench microstructures increase and the hydrogen does not outflow from the HAZ easily when increase the cooling rate, so the susceptibility of hydrogen cracking increases. 相似文献
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