ASNT Level 3 Ultrasonic Testing Course
ASNT Level 3 Ultrasonic Testing Course Fees 450 $ | ASNT Level 3 Ultrasonic Testing Course Exam Fees To be informed | ASNT Level 3 Ultrasonic Testing Course Duration 20 Days | ASNT Level 3 Ultrasonic Testing Course Location Muscat
Selection of Ultrasonic Testing
Ultrasonic testing is an important method within the broad field of nondestructive testing. Ultrasonic techniques usually fall into one of the following categories: internal discontinuity detection, cross
section evaluation (thickness testing) or bond characterization. Some techniques can be subdivided even further.
Cross section evaluation (thickness testing, corrosion mapping and others) is the most widely used application as applied to new and inservice components used in various industries. Thicknesses of structural materials can be measured from a micrometer to a meter with accuracies of better than one percent. The method can also be used to determine physical properties, structure, grain size and elastic constants.
Ultrasonic instrumentation is designed to detect structural characteristics of a component. These characteristics range from simple cross sectional thickness to complex geometries for various fabrication or inservice discontinuities.
Limitations of Ultrasonic Testing
Ultrasonic testing may be limited by component geometry (size, contour, surface roughness, complexity and discontinuity orientation) and undesirable internal structure characteristics (grain size, grain orientation, acoustic impedance differences of joined material and others). Because most ultrasonic
techniques require some type of couplant to eliminate air between the transducer and the test surface, component compatibility with the couplant and test object temperature can become a factor.
Ultrasonic equipment compatibility with the test environment (temperature, radiation levels, electrical interference and others) may also affect the effectiveness of testing, ASNT Level 3 Ultrasonic Testing Course covers the final potential limitation is the skill of the inspector as it relates to the ultrasonic technique and knowledge of the component characteristics.
Advantages of Ultrasonic Testing
Modern ultrasonic test techniques offer an economical means for high speed, large or small scale testing of materials and structures such as those found in nearly every industry. ASNT Level 3 Ultrasonic Testing Course covers Many of the materials used in industry today can be evaluated by one or more of the ultrasonic techniques using various equipment types (digital thickness gage, manual discontinuity detectors, remote automated scanning systems and others).
When proper techniques are coupled with appropriate equipment, ultrasonic tests are highly sensitive (permitting detection of minute discontinuities), penetrate very thick or long sections of materials, provide required information to accurately measure the location and size of discontinuities, provide rapid evaluation of materials (by manual or automated means) and require access from only one side of the test object.
Test Procedures for Ultrasonic Testing
The conduct of test operations (in-house or contracted) should be performed in accordance with specific instructions from an expert. Specific instructions are typically written as a technical procedure.
In many cases, codes and specifications will require that a technical procedure be developed for each individual test. In other cases, the same procedure is used repeatedly.
Ultrasonic Test Frequencies
A single ultrasonic test system can be used for many different measurements through the selection of test frequencies. These frequencies are usually those that correspond to bandwidths that match the resonant frequency of the ultrasonic transducer designed for a specific application. Frequency is measured in hertz (Hz). The range of audible frequencies for most adult humans is about 0.02 to 20 kHz. Most industrial
ultrasonic tests are made in the frequency range between 1 and 15 MHz.
Most ultrasonic test equipment provides several fixed frequency steps. Thus, appropriate frequencies can be readily selected by the inspector to meet requirements of the test and to match the search unit selected. Lower frequencies are typically used in applications where it is desirable to minimize sound attenuation as a result of material grain size or for long distances. Higher test frequencies are used for applications where increased sensitivity is required and sound attenuation is not a problem.
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