多层多道平焊接头冲击性能不稳定的原因分析
Analysis of impact toughness variation for flat position multi-pass weld joint
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摘要: 以X70管线钢用药芯焊丝多道焊平焊接头为研究对象.用光镜和扫描电镜观察焊接接头和冲击试样金相组织、寻找冲击断口起裂源，对焊缝冲击韧性不稳定且出现低值的原因进行了研究.结果发现，冲击试样的取样位置不同，冲击吸收功不同；冲击试样开缺口处柱状晶所占比例是冲击韧性出现波动的一个主要原因，但不是其出现低值的原因；缺口前沿焊接缺陷的位置以及粗大晶粒是冲击韧性波动以及出现低值的主要原因，试样冲击吸收功为54.2 J时是解理断裂，解理断裂试样的起裂源为夹杂、未熔合等焊接缺陷，且这些缺陷的位置距缺口越近，冲击韧性越低.Abstract: A multi-pass weld metal in flat position was studied, which was welded by a flux cored wire used in X70 pipeline. Analysis included observation of the fracture surfaces to determine initiation location (optical and scanning electron microscopy) and metallographic examination of the weld microstructures. It was found that the position of impact specimen is different, which will cause different impact energy; the proportion of the columnar crystal or coarse crystal area,which was near the position of impact specimen notch root, was a main reason for the impact toughness variation but is not the main reason of low values. The weld defects and coarse grain were the main reason for the variation and low values of impact toughness. When the impact energy is 54.2 J, the impact sample was cleavage fracture. Crack source were welding defects such as inclusions, the defects of incomplete fusion and so on, and the nearer the position of these defects to the notch, the smaller the impact energy.
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Keywords:
- multi-pass weld metal /
- impact toughness /
- variation
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