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所在平台: Udemy |
课程主页: https://www.udemy.com/course/ultrasonic-testing-non-destructive-testing-level-ii/
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课程名称：超声检测 - 无损检测 - 二级 课程概述：超声检测（UT）基于声能原理，通过超声波在被检测物体或材料中的传播来实现检测。它是无损检测中一种重要的方法。超声检测通常使用频率在0.1-15 MHz之间的极短超声脉冲波，有时可达到50 MHz，检测材料内部缺陷或表征材料。例如，超声厚度测量用于测试物体的厚度，以监测管道的腐蚀情况。超声检测通常应用于钢材及其他金属和合金，也可以用于混凝土、木材和复合材料，尽管其分辨率较低。 超声检测的优点： - 超声检测具备极强的穿透力，能够检测到部件深处的缺陷。 - 对微小缺陷的敏感度较高。 - 在许多情况下，仅需一个表面可以接触。 - 在确定内部缺陷深度和具有平行表面的部件厚度方面的准确性高于其他无损方法。 - 能在一定程度上估算缺陷的大小、方向、形状和性质。 超声检测的缺点： - 超声检测需要经验丰富的技师给予高度注意。传感器会对一些材料的正常结构及其他标本的可容忍异常（均称为“噪声”）进行报警，并检测可能影响标本完整性的严重故障。这些信号需要由熟练技师区分，可能需要结合其他无损检测方法进行后续检测。 - 开发检测程序需要丰富的技术知识。 - 对于表面粗糙、形状不规则、非常小或薄弱、不均匀的部件，检测较困难。表面需要清洁和去除松散的鳞片、油漆等，虽然正确粘附在表面的油漆不必去除。 该课程旨在为学员提供超声检测的深入理解和操作技能，适合希望在无损检测行业中提升专业能力的学习者。
Ultrasonic Testing (UT) is based on the principle of sound energy that is the propagation of ultrasonic waves in the object or material tested. It is one of the important methods used in Non-destructive TestingIn most common UT applications, very short ultrasonic pulse-waves with center frequencies ranging from 0.1-15 MHz, and occasionally up to 50 MHz, are transmitted into materials to detect internal flaws or to characterize materials.A common example is ultrasonic thickness measurement, which tests the thickness of the test object, for example, to monitor pipework corrosion.Ultrasonic testing is often performed on steel and other metals and alloys, though it can also be used on concrete, wood, and composites, albeit with less resolution.Advantages of Ultrasonic Testing-· Ultrasonic Testing has very high penetrating power, which allows the detection of flaws deep in the part.· Higher insensitivity, so permitting the detection of extremely small flaws.· In many cases, only one surface needs to be accessible.· Greater accuracy than other nondestructive methods in determining the depth of internal flaws and the thickness of parts with parallel surfaces.· Some capability of estimating the size, orientation, shape, and nature of defects.Disadvantages of Ultrasonic Testing-· In UT careful attention by experienced technicians is required. The transducers alert to both normal structure of some materials, tolerable anomalies of other specimens (both termed "noise"), and to faults therein severe enough to compromise specimen integrity. These signals must be distinguished by a skilled technician, possibly requiring to follow up with other non-destructive testing methods.· Extensive technical knowledge is required for the development of inspection procedures.· Parts that are rough, irregular in shape, very small or thin, or not homogeneous are difficult to inspect. The surface must be prepared by cleaning and removing loose scale, paint, etc., although paint that is properly bonded to a surface need not be removed.
