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Flaw Detectors

GAOTek flaw detectors examine a material by making sound waves at high frequency to pass through the material and are for sale to the United States, Canada and globally. They are used for applications that require ultrasonic testing. Our flaw detectors are affordable high quality devices that provide accurate detection for easy testing and monitoring. They are compact, easy to carry and portable devices that allow the user to work in complex conditions and circumstances.


Flaw detectors are commonly used in ultrasonic testing applications. The detector emits high frequency sound waves when a flaw is detected. These waves are reflected and generate clear echo patterns. Ultrasonic testing is a non-destructive testing method, and is a safe testing method widely used in industries that heavily employ metal wielding in their production such as manufacturing.

The concept of ultrasonic flaw detection is demonstrated when a sound wave vibrates through a solid, liquid or gaseous medium, the waves pass through the medium in a predictable direction. It transmits back signals once they get bumped onto a medium. A few important terms related to wave travel through different media are:

  • Velocity – The speed and direction of sound travel in a medium. It is affected by the thickness of the medium.
  • Frequency – Sound waves vacillate at a specific frequency. Sound frequencies in the range of megahertz do not travel efficiently through gases, although they can freely travel in liquid and solid materials.
  • Wavelength – This is the distance between two subsequent points in a wave cycle as it travels through a medium.
  • Modes of propagation – Sound waves in solid media can exist in various modes of propagation. Common modes employed in ultrasonic flaw detection include longitudinal waves and shear waves. The distance a wave travels depends on the material it passes through. Hard and homogenous materials allow a sound wave to pass easily as compared to soft, heterogeneous or granular materials. Three factors control the distance a sound wave travels in a medium - beam spreading, attenuation, and scattering.

Modern flaw detectors are compact and portable instruments with a microprocessor. Commonly used in shop and field applications, they display an easy-to-read ultrasonic waveform that can be understood by a trained operator to analyze and detect the flaws in test pieces. They typically consist of a data logging module, a software for capturing signal analysis, waveform display, and an ultrasonic pulse recorder and receiver.

Echo patterns from echo responses representing flaws can be identified by utilizing the appropriate standards, accepted test procedures, and knowledge of sound propagation. Standards used in ultrasonic flaw detection are namely straight beam testing and angle beam testing.

Although modern ultrasonic flaw detectors widely used today are more efficient as they employ digital processing for more accuracy, stability and reliability, analog based detectors are still in production and use in many applications.


GAOTek flaw detectors are reliable, accurate, and easy to use. Their features include:

  • Automated calculation - calculate the magnitude of a flaw with wide button type AVG function
  • 500 independence setup - Any criterion can be input freely. They can work in the scene without test block
  • Li battery - can be used continuously for more than 10 hours
  • Case – A dedicated wind and dust cover makes our devices durable and convenient to use
  • Injection mold tank – can resist wear, fall off, and corrosion
  • Uni case - High-capacity measuring accessories in a transparent case for visibility and ease of use
  • Aerobatic buoyancy compensation and bound of density function setting
  • Function of setting actual water temperature, medium density, and water proof medium density
  • Function of solution compensation. This is necessary if a liquid other than water is used as a medium for measurement
  • Automatic sensor – A sensor analyzes whether the sample is qualified or not, and prompts alarm
  • These devices can be used in metallurgy, magnetic materials, ceramics, fireproofing materials, precious metal and so on
  • Percentage display – They display the percentage composition of mixed samples to offer more convenience in researching and developing new materials
  • Simple operation with no need to open and close the lid
  • Short time for detection as per the specification of new materials laboratory
  • Background color selection
  • Adjustable display brightness
  • Compact and lightweight making them flexible to use in complex conditions
  • Offline and online charging
  • Microsoft Excel support
  • High-speed capture and very low noise level
  • Automated echo degree
  • Automatic display flaw detection
  • Big memory of 1000 A graph
  • Automatic calibration of transducer zero offset/velocity
  • DAC, AVG, TCG, B Scan, Solid metal housing (IP65)

Flaw detectors are commonly used in metals and alloys. They can also be used for solid objects such as wood, composite, and concrete. They are used in applications such as aerospace, automotive, manufacturing, production process, steel and metal construction, metallurgy, transportations, and welding.

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