Magnetic Memory Characteristics of the 15CrMoR Welding Cold Crack
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摘要: 通过对15CrMoR钢斜Y型坡口焊接试件的焊后金属磁记忆检测,分析了焊接冷裂纹的磁记忆特性,得到了冷裂纹萌生及扩展过程的磁记忆信号变化规律.由于焊接冷裂纹产生过程中应力集中效应复杂,常有干扰信号出现,因此首先使用小波变换对磁记忆信号进行降噪处理,然后采用“分段最大K值判别法”对磁记忆测试结果进行处理和分析.结果表明,磁记忆检测技术能够对焊接冷裂纹的起裂点进行定位,并根据焊缝整体的磁记忆信号的变化情况可对冷裂纹的扩展方向进行判断.Abstract: According to the metal magnetic memory(MMM) testing of 15CrMoR Y-slit type cracking after welding,the paper studied the magnetic memory characteristics of welding cold crack and got the law of magnetic memory signal in cold crack initiation and propagation process.Due to the complexity of stress concentration effect,firstly the wavelet transform was used to reduce the noise of magnetic memory signal and then the piecewise analysis method of maximum K was used to process and analyze the experiment results in the paper.The result shows that the MMM technology can locate the cold crack initiation and identify the propagation direction of crack by the change of magnetic memory signals.
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Keywords:
- Cold crack /
- Metal magnetic memory /
- Stress concentration /
- Crack initiation /
- Wavelet analysis
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