Nondestructive inspection relevant explanation

1. What is nondestructive inspection

Nondestructive testing (NDT)Nondestructive testing in industrial field is similar to guess watermelon from outside of skin,when buying watermelon,use hands to beat watermelon skin,listen the sound or feel it ,and guess whether this watermelon is ripe or not,this is habit owned by human beings.if doubt about the suppose,then cut off and have a look at it。Use hand to slightly beat,has no damage to watermelon,nondestructive,listen sound or feel it to guess whether it is ripe,this is nondestructive testing of life,and cut off and have a look at ,is destructive testing ,no matter how nondestructive testing develops,”guess watermelon from the skin” the content is not changed;if doubt on results,then cut off to prove,this basic thought is not changed too。

Ancient and simple nondestructive testing method like beat appliance,listen sound,identify crack ,is methods that used until now,but due to they can not make “basic conform“ judge on position and size of flaw,so they are not thought as nondestructive methods。Only technical methods can make sure nondestructive testing result like above accurate and repeatability,usually the nondestructive testing methods are RT UT and so on。

Nondestructive testing:on the promise of not destroying,inspect workpiece objective flaw or measure workpiece feature。

Nondestructive flaw detection:inspecting workpiece objective flaw

What other methods does Nondestructive testing have?

Nondestructive testing methods have a lot of ,and divided into six categories ,about 70kinds,but in practical application more common to use is as follows:

Normally nondestructive testing methods have:

Ultrasonic Testing --(abbreviation is UT)

Radiographic Testing（abbreviation isRT）

Magnetic particle Testing（abbreviation isMT）

Penetrant Testing (abbreviation isPT）

Eddy current Testing（abbreviation isET）

Irregular nondestructive testing techniques areAcoustic Emission (abbreviation isAE)

Leak Testing（abbreviation isUT）

Optical Holography

Infrared Thermography

Microwave Testing 

3.What applications does Nondestructive testing have

Applicable time:design phase:manufacturing process :finished product inspection :inservice inspection

Applicable target:many kinds of material (metal nonmetal)  many kinds of workpiece  (welding piece  casting  forging )   many kinds of engineering (road construction dam construction bridge construction airplane construction)。