焊接冷裂纹起裂位置及扩展方向分析

Analysis of Initiation Position and Propagation Direction of Welding Cold Crack

冷裂纹的产生和扩展具有延迟特性,为了尽可能减小延迟裂纹给设备带来的危害,有必要对其发生时间、产生位置以及裂纹扩展方向进行研究。本文利用声发射源定位方法对SPV490Q钢焊接冷裂纹进行实验监测分析,确定其产生的时间、位置和扩展方向;采用有限元分析方法研究焊缝冷裂纹起裂位置和扩展方向的数值模拟规律,以对上述实验分析结果的准确性进行验证。

The generation and propagation of cold cracks have delay characteristics. In order to minimize the damage caused by delayed cracks to equipment, it is necessary to study the occurrence time, location and direction of crack propagation. In this paper, the acoustic emission source localization method is used to monitor and analyze the welding cold crack of SPV490Q steel in order to determine the time, location and propagation direction of the welding cold crack. The numerical simulation law of the crack initiation and propagation direction of the welding cold crack is studied by using finite element analysis method to verify the accuracy of the above experimental results.