Detection and quantification of weld internal defects by multi-mode total focus method
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摘要: 研究多模式全聚焦方法对钢板对接焊缝内部不同倾斜角度缺陷的定量能力。以矩形刻槽代表焊缝内的条状缺陷，采用有限元方法获取刻槽单频散射系数，同时与波传播模型结合进行全矩阵数据模拟，对倾角不同的刻槽进行仿真成像。结果表明，LL-L，TT-T，TT-L等3种半跨模式可覆盖0°~40°倾角的缺陷，TL-LT，LL-LL，TL-TL，TT-TL，TT-LL等5种全跨模式可覆盖10°~70°倾角的缺陷，对缺陷角度表征能力最佳，应在实际检测中优先考虑。另外，刻槽长度定量易受散射强度影响，用同一阈值进行定量识别并不适合全部模式。Abstract: The quantitative ability of multi-mode total focus method for defects with different inclination angles in butt weld of steel plate was studied. The rectangular slot was used to represent the sliver defect in the weld, the single-frequency scattering coefficient of the slot was obtained by the finite element method, and combined with the wave propagation model for full matrix data simulation, the slots with different dip angles were simulated and imaged. The results showed that different modes had different coverage for defect angle. Three half-span modes, LL-L, TT-T and TT-L, can cover the defects of 0~40°dip angle, and five full-span modes, TL-LT, LL-LL, TL-TL, TT-TL and TT-LL, can cover the defects of 10~70°dip angle, they had the best characterization ability for defect angle, and should be given priority in practical detection. In addition, the quantitative identification of slot length was easily affected by the scattering intensity, and the quantitative identification with the same threshold was not suitable for all modes.
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