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Latest update: 19/10/2022 16:03:05

KYUKEN Co.,Ltd.

Non-destructive inspection and examination of metal, concrete, and so on

Non-destructive inspection is a technology for inspecting whether there is an internal flaw or a flaw, invisible to the naked eye, on the surface, without the need for destroying the object. Kyuken Co., Ltd. inspects structures made of metal or concrete which include bridges, tunnels, and factory equipment (pipes and tanks).  

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Inspection methods
PT: Penetrant Testing
PT (Penetrant Testing) is a method mainly used for detecting cracks, blowholes, and other defects that open on metal surfaces. Since PT does not require massive equipment, and depending on the method, a power supply, it is an inspection method widely applied in various settings. The objects to be inspected vary widely. PT can be applied to objects regardless of whether they are metal or non-metal ones, except for objects with a porous surface (one example of which is a sponge).
MT: Magnetic Particle Testing
MT (Magnetic Particle Testing) is a method in which an electric magnet is put on a metal surface to generate a magnetic field so as to detect flaws. 
Similar to PT, MT is aimed at detecting flaws on metal surfaces. However, unlike PT, MT can detect flaws around the surface that are not opened to it. Generally, compared with PT, a notable characteristic of MT is that it can highly accurately detect flaws. 
However, MT cannot be applied to non-magnetic materials (stainless steel, aluminum, and so on) which cannot be magnetized.
UT: Ultrasonic Testing
UT (Ultrasonic Testing) is an inspection method which uses ultrasonic reflection to detect foreign objects and voids in the object under examination. 
Ultrasonic waves are sounds with high frequencies that cannot be perceived by human ears and have a property of going straight in a substance.  
When ultrasonic waves going straight hit the boundary of a foreign object or void, they are reflected at the boundary. Receiving the reflected ultrasonic waves leads to the detection of the existence of a reflection source (a "flaw", in this case). 
Calculating conditions such as the sonic speed of the ultrasonic waves in the object under examination and the time between transmission and reception enables the identification of the position of the flaw. In the field of UT, software is actively developed on a global scale. New methods and devices are being developed one after another.

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Kyushu Head Office, SMRJ
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