插入式管座角焊缝缺陷的柔性相控阵检测技术研究

RESEARCH ON PLUG-IN FILLET WELD FLAW DETECTING BY USING FLEXIBLE PHASED ARRAY TECHNIQUE

针对插入式管座角焊缝的结构特征,提出了一种将柔性相控阵探头置于管子内壁进行水浸检测的新方法,理论分析了水钢界面凸面相控阵声场的波束聚焦模型,同时利用CIVA软件对柔性相控阵所激发的聚焦声束进行了仿真,并在插入式管座角焊缝模型中添加常见的典型缺陷,得到缺陷响应图谱。在实验室环境下,在带有人工缺陷的试样上进行了系统调试和检测试验,成功的检测出了插入式管座角焊缝中的裂纹、夹渣和气孔缺陷。最后,将专用超声波检测系统应用于现场产品制造的质量检测,并发现了一处未焊透和一处气孔缺陷信号,有效的保证了产品中焊接缺陷的检出。

According to the common structure characteristics of the plug-in fillet weld,a new weld defect detecting method was presented in this paper.The flexible phased array probe was inserted into the internal surface of the tube under water immersion during the detection process.The beam focusing model of convex flexible phased array was theoretically analyzed.Meanwhile,the acoustic focus beam with CIVA software were simulated.The typical flaws were added to the model of plug-in fillet weld,and defect response were obtained.The sample of the plug-in fillet weld with artificial flaws is manufactured,the system was calibrated in the laboratory.The experiment results indicated that this technique can successfully detect the typical flaws of crack,slag and porosity.Finally,the technique was applied to the manufacture quality inspection of the products,one incomplete penetration and one porosity were detected.The detecting system can effectively ensure the general welding flaws of the product were detected.