Flaw Detectors

GAOTek flaw detectors are used as a test of the material by using sound waves of high frequency in the material that will be tested. Our tool is commonly used for applications that require ultrasonic testing. GAOTek flaw detectors are reliable, high quality, and affordable equipment that provide an accurate detection for easier testing or monitoring. It is compact, easy to carry and portable to allow the user to work in complex conditions and various circumstances.


Flaw detectors are most commonly used in applications of ultrasonic testing, in which is it emits a high frequency of sound waves then when a flaw is detected, it is reflected and it generates clear echo patterns. Ultrasonic testing is considered a non-destructive testing; thus, it is a safe testing method that is widely used in various industries such as manufacturing or production process where metals are wield and used.

The concept of ultrasonic flaw detection is when a sound wave vibrates through a medium such as solid, liquid, or gas. The waves that passes through in a predictable direction then when it bumps, it is then transmitted back.

Velocity – the speed travel in which the sound waves varies depending on the medium it is travelling. It is affected by the thickness of the medium.

Frequency – sound waves vacillate at a specific frequency. Which it is pitch in a range of audible sound. Sound frequencies in megahertz range does not travel efficiently through gasses, although it can freely travel in liquid and solid materials.

Wavelength – the distance between two subsequent points in a wave cycle as it travels through a medium.

Modes of propagation – Sound waves in solid mediums can exist in various modes of propagation that are described by the sort of movement involved. Common modes employed in ultrasonic flaw detection include; longitudinal waves and shear waves.

There are variables than can limit the transmission of sound waves. The distance of a waves will travel depends in the material it will be passing through. Hard and homogenous materials will allow to transmit sound wave more effectively compared to soft, heterogeneous or granular materials. Three factors control the distance a sound wave will travel in a medium: beam spreading, attenuation, and scattering.

Nowadays, many modern flaw detectors are compact and portable instruments containing microprocessor. Commonly used in shop and field applications, It displays an easy-to-read ultrasonic waveform that can be understood by a trained operator to analyze and detect the flaws in test pieces. It will typically comprise of software for capturing signal and analytical analysis, data logging module, waveform display, and a ultrasonic pulser and receiver.

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


Although modern ultrasonic flaw detectors are commonly used today and utilize the digital processing for more accuracy, stability and reliability, there are still analog-based detectors being produced.


GAOTek flaw detectors are reliable, accurate, and easy to use to help prevent failure in operations. It is featured with:

l  Automated calculation: calculates the size of the flaw with w ide button type in AVG function

l  500 independence setup: any criterion can be input freely. It can work in the scene without test block.

l  Li battery: able to continue its usage for more 10 hours.

l  Case: dedicated wind and dust cover, which makes the combination convenient and durable

l  Injection mold tank: resist wear, fall off, and corrosion.

l  Uni case: high-capacity measuring accessories with the transparent.

l  Function of setting aerobatic buoyancy compensation and bound of density.

l  Function of setting actual water temperature, measuring medium density, and water proof medium density.

l  Function of solution compensation. Necessary if liquid other than water for used as a medium for measuring.

l  Automatic sensor: analyzes whether the sample is qualified or not and prompt alarm.

l  Can be used in metallurgy, magnetic materials, ceramics, fireproofing materials, precious metal and so on.

l  Percentage display: display the percentage composition of mixed samples to allow more ease when researching and developing new materials.

l  No need to open and close the lid; Simple operation; Shorter time; According to the specification of new materials laboratory.

l  Background color selection.

l  Adjustable display brightness.

l  Compact and lightweight: for easy to carry and flexibility to use in complex conditions.

l  Offline and online charging.

l  Microsoft Excel support.

l  High-speed capture and very low noise level.

l  Automated echo degree.

l  Automatic display flaw detection.

l  Big memory of 1000 A graph.

l  Automatic calibration of transducer zero offset/velocity.

l  DAC, AVG, TCG, B Scan. Solid metal housing (IP65) 


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

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