Overview of five nondestructive testing methods

Nondestructive testing includes five testing methods: radiographic testing (RT), ultrasonic testing (UT), magnetic particle testing (MT), penetrant testing (PT) and eddy current testing (ET). It is mainly used for raw materials, parts and welds of machinery and devices made of metal materials, and can also be used for other products such as glass.

Radiographic testing is suitable for welds and steel pipe butt joints of machinery and devices made of carbon steel, low alloy steel, aluminum and aluminum alloy, titanium and titanium alloy. Radiation is harmful to the human body, and direct radiation and scattered radiation should be avoided as much as possible.

Ultrasonic testing refers to the use of A-type pulse reflection ultrasonic flaw detector to detect defects, which is suitable for ultrasonic testing and ultrasonic thickness measurement of raw materials, parts and welds of metal products.
Magnetic particle testing is suitable for the detection of surface and near-surface defects of ferromagnetic materials and their parts, including dry magnetic powder, wet magnetic powder, fluorescent and non-fluorescent magnetic powder testing methods. Penetrant testing

is suitable for the detection of open defects on the surface of metal products and their parts, including fluorescent and colored penetrant testing.

Eddy current testing is suitable for pipe testing, such as round seamless steel pipes and welded steel pipes, aluminum and aluminum alloy thin-walled pipes, etc.

Magnetic particle, penetrant and eddy current are collectively referred to as surface testing. (end)