小径薄壁管座角焊缝典型缺陷的超声相控阵CIVA仿真研究

在电厂安放式小径薄壁管座角焊缝超声检测技术中,检测结果易受到管径小、检测位置结构复杂等因素影响,因此,采用CIVA软件对焊缝模型进行超声相控阵声场仿真,得到未熔合、未焊透、裂纹和夹渣4种典型缺陷在不同检测位置曲率下的缺陷响应.对比分析仿真缺陷图谱,研究检测位置曲率对缺陷成像和声压幅值的影响,结合优化后的仿真参数和检测方...

Ultrasonic Phased Array CIVA Simulation of Typical Defects in Fillet Welds of Small-diameter Thin-walled Tube Bases

In the ultrasonic testing measures of small-diameter thin-walled tube base fillet welds in power plant, the detection results were easy to be affected by the features of testing part with small diameter and complex structure of detection position. Therefore, simulation of the ultrasonic phased array acoustic field of the weld model was proposed using CIVA software. Defect responses of four typical defects including incomplete fusion, incomplete penetration, crack and inclusion were obtained at different detecting position curvatures. Then, the simulated defect maps were compared and analyzed to study the influences of detecting postion curvatures on the defect imaging and the sound pressure amplitude. Finally, the detection technology was developed by combining optimized simulation parameters and detection methods. Experimental results show that the detection technology herein may effectively detect weld defects at various detection position curvatures.