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In equipment maintenance and management, corrosion detection is a crucial step. Although traditional detection techniques are effective, with technological advancements, pulse eddy current testing has...
Ultrasonic detector is a portable industrial non-destructive testing instrument. It can quickly, conveniently and non-invasively detect, locate, evaluate, and diagnose various defects (cracks, looseness, porosity, inclusions, etc.) in the interior of workpieces.
It can be used in laboratories as well as in engineering sites. It is widely used in industries such as boilers, pressure vessels, aerospace, aviation, power, petroleum, chemical, offshore oil, pipelines, military industry, shipbuilding, automobiles, machinery manufacturing, metallurgy, metal processing, steel structures, railway transportation, nuclear power, and universities.
When ultrasonic waves propagate in the tested material, the acoustic properties of the material and the changes of its internal structure have a certain impact on the propagation of ultrasonic waves. The technology that detects the degree and condition of ultrasonic waves affected to understand the material's properties and structural changes is called ultrasonic testing. Ultrasonic testing methods typically include penetration, pulse reflection, and tandem methods.
How to test the blind zone of an ut flaw detector? Let's take a look together.
Instrument
one general ultrasonic flaw detector;
Probe
2.5P20Zstraight probe one;
Connection cable
one probe connection cable;
Test block
CSK-IAtest block one;
Coupling agent
one bottle of machine oil.
First, enter the instrument channel parameter interface.
Detection range
adjust to 50mm.
Operating mode
set to "single".
"Inhibit"
Adjust to 0.
Probe Type
Set to direct probe.
Probe Delay
Here, the early measurement is set to 1.47 microseconds (us).
Using the CSK-IA test block A surface, measure the blind zone size with a margin of 5 mm and 10 mm on both sides of the Φ50mm hole pitch.
Place the probe at the 5mm margin on the CSK-IA test block A surface, at the 10mm margin on the side, and on the time baseline. Observe if there is a valley between the hole wave and the start wave. If the valley is not on the time baseline, the hole wave cannot be distinguished.
Generally, place the probe at the 10mm margin, find the Φ50mm hole wave, and make the Φ50mm hole wave 80% of full amplitude. On the time baseline, if the valley between the hole wave and the start wave can be distinguished, the blind zone is less than 10mm. The test result here can distinguish the valley between the hole wave and the start wave.
Then, move to the 5mm margin, making the Φ50mm hole wave 80% of full amplitude. On the time baseline, if the valley between the hole wave and the start wave cannot be distinguished, the blind zone is at least 5mm. The ultrasonic flaw detector test result here indicates that the instrument cannot distinguish the valley between the hole wave and the start wave, and the blind zone of this instrument is at least 5mm.
