共查询到19条相似文献,搜索用时 203 毫秒
1.
2.
介绍用超声相控阵技术检测薄板焊缝时,通过短脉冲复合阵列探头的扇形扫描(S扫描),借助于阵列窗孔的调节动态改变声束焦点位置,以此提高裂纹端部信号分辨力的有效途径,并给出了相控阵S扫描图形的各种示例,期望为国内推广该UT新技术提供借鉴。 相似文献
3.
4.
5.
6.
涉及一种基于水膜耦合式的钢管自动超声波探伤探头振动补偿方法,其特征在于:通过自动监测耦合水膜厚度的变化,调整钢管自动超声波探伤的报警信号闸门值,实现对钢管的缺陷检测。该方法针对探头上下振动影响缺陷检测的情况,提 相似文献
7.
8.
9.
10.
所述装置涉及无缝钢管加工领域,是一种钢管端部感应加热装置,包括箱体、感应线圈、线圈进水管、线圈出水管和感应线圈连接母排。箱体上开有测温探头固定口,测温探头穿过测温探头固定口伸入感应线圈中。该装置可随时检测温度,并 相似文献
11.
介绍了焊管常用的3种探伤方法(漏磁探伤、涡流探伤和超声波探伤)及技术。分析了3种探伤方法的优缺点:漏磁探伤灵敏度高,能很好地分辨出焊管内外壁缺陷,但长管体、大壁厚管在漏磁探伤后需做消磁处理;涡流探伤检测速度快,但受趋肤效应的限制,很难发现工件深处的缺陷;超声波探伤穿透能力强、缺陷定位准确、成本低、速度快,但探伤操作需经耦合,在北方严冬环境下耦合时焊管易冻结,给探伤作业带来不便。 相似文献
12.
13.
无损检测交变磁场测量法 总被引:13,自引:3,他引:10
准确测定缺陷的尺寸,对带缺陷结构的寿命评估具有十分重要的意义。交流磁场测量法是近年来兴起的一种评价表面缺陷的无损检测方法,它通过测量工件表面感应磁场的变化来进行材料中缺陷的定性定量,具有非接触的优点,广泛应用于结构的在役检测。 相似文献
14.
介绍了一种无损检测方法——多频远场涡流检测技术,来解决电力行业的交换器、换热器的快速在役检查。对检测原理,方案实施,缺陷评判等进行了详细说明。 相似文献
15.
An automated radiographic NDT system for weld inspection has been developed. The entire system consists of two major components: weld extraction and flaw detection. Part I of the system implemented a weld extraction methodology, which has been presented in a previous paper. This paper presents Part II of the system dealing with the detection of welding flaws. The flaw detection methodology is developed based on the fitted line profiles of a weld image and consists of four modules: preprocessing, curve fitting, profile-anomaly detection, and postprocessing. The successful detection rate and false alarm rate of the methodology are reported based on the test results of 24 representative welds. 相似文献
16.
17.
多功能无缝钢管检测装置利用计算机控制,综合采用了多种探伤、测量方法,其通过率高,故障率低,检测结果准确,可对管材横向和纵向裂纹、内外折等表面缺陷及局部壁厚变化、直径和长度、管壁厚度以及合金元素等进行100%的检测。介绍了该装置的构成及检测原理。 相似文献
18.
《NDT & E International》2008,41(8):602-610
This paper presents a novel optical technique, reflective fringe pattern (RFP), for non-destructive testing (NDT) of objects having specularly or semi-specularly reflective surfaces. The principles are based on measuring the surface deformation of a test object and identifying deformation anomalies caused by subsurface flaws. RFP is not based on optical interference and therefore, it is not subjected to the severe limitations of interferometry. Compared with the conventional methods of NDT techniques, RFP measures the response of a flaw to applied stresses, and hence it provides more direct information about the flaw criticality. In this paper, experimental demonstrations of the present technique to subsurface crack detection are presented. Two software-based methods are also adopted to enhance the flaw visibility on the output of RFP. 相似文献
19.
A research about the ultrasonic phased array imaging principle from A-scan signal to B-scan image for non-destructive testing (NDT) was conducted in this paper, the ultrasonic phased array inspection imaging system used in industrial field was developed and the experiment was performed on the steel testing block by the system with 64 elements, 5 MHz phased array transducer. Experimental results show that the flaws could be accurately detected and the flaws size could be estimated from the B-scan images, and the B-scan images could clearly show the location of the flaws, but the quality of B-scan images needs to be enhanced by digital signal processing and controlling dynamic focusing for improving the image resolution. 相似文献