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许彦, 刘迎来, 聂向晖, 丰振军, 李亮, 杨锋平. 高匹配搭接角焊缝力学性能及应用效果分析[J]. 焊接学报, 2022, 43(10): 101-105. DOI: 10.12073/j.hjxb.20211021001
引用本文: 许彦, 刘迎来, 聂向晖, 丰振军, 李亮, 杨锋平. 高匹配搭接角焊缝力学性能及应用效果分析[J]. 焊接学报, 2022, 43(10): 101-105. DOI: 10.12073/j.hjxb.20211021001
XU Yan, LIU Yinglai, NIE Xianghui, FENG Zhenjun, LI Liang, YANG Fengping. Analysis of mechanical properties and application effect of over-matching lap angle weld joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(10): 101-105. DOI: 10.12073/j.hjxb.20211021001
Citation: XU Yan, LIU Yinglai, NIE Xianghui, FENG Zhenjun, LI Liang, YANG Fengping. Analysis of mechanical properties and application effect of over-matching lap angle weld joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(10): 101-105. DOI: 10.12073/j.hjxb.20211021001

高匹配搭接角焊缝力学性能及应用效果分析

Analysis of mechanical properties and application effect of over-matching lap angle weld joint

  • 摘要: 采用等匹配和高匹配焊材完成了高钢级B型套筒修复高钢级管道的试验研究. 结果表明,等匹配焊接和高匹配焊接的角焊缝焊接接头都具有良好的拉伸强度和冲击韧性,高匹配焊接接头熔覆金属的冲击韧性略低于等匹配,其焊接接头延展性略差;施焊后等匹配搭接角焊缝未发现焊接缺陷,焊接接头维氏硬度最大值为293 HV10,出现在角焊缝外表面与套筒搭接焊缝处;高匹配搭接角焊缝出现了起源于角焊缝外表面层的横向裂纹,且该焊接接头硬度整体偏高,最大值出现在外表面中心位置焊缝处,为403 HV10,与裂纹起裂位置对应,其产生原因与焊接过程中不同部位熔池金属冷却速率有关,尤其是外表面盖面焊处冷却速度较快,外壁层硬度值异常偏高,萌生裂纹.因此建议搭接角焊缝焊接焊材选择时,在不影响密封和承载前提下,可尝试降低焊缝匹配强度等级.

     

    Abstract: The experimental analysis of repairing high-grade steel pipeline with high-grade B-type sleeves is completed by using matching and over-matching welding materials. The results show that the fillet weld joints of matching welding and over-matching welding have good tensile strength and impact toughness. The impact toughness of cladding metal of over-matching welded joint is slightly lower than that of matching, and the ductility of welded joint is slightly poor. No welding defects were found in the matching lap fillet weld after welding. The maximum Vickers hardness of the welded joint was 293 HV10, which appeared at the lap weld between the outer surface of the fillet weld and the sleeve. The transverse crack originated from the outer surface layer of the fillet weld appeared in the high match lap fillet weld, and the hardness of the welded joint is generally high. The maximum value appears at the weld at the center of the outer surface, with a value of 403 HV10, which corresponds to the crack initiation position. The reason is related to the cooling rate of molten pool metal in different parts during the welding process, especially the cooling rate at the welding place of the outer surface cover is fast, the hardness value of the outer wall layer is abnormally high, and cracks are initiated. Therefore, it is suggested that when selecting welding materials for lap fillet weld, try to reduce the matching strength grade of the weld without affecting the sealing and bearing.

     

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