figure 1 shows the cross section of a weld bend from a larger engineering parts.
ID: 1867233 • Letter: F
Question
figure 1 shows the cross section of a weld bend from a larger engineering parts. outline the most appropriate NDT techniques to detect the listed defeats before cross sectioning the material: 1) weld metal crack. 2) toe crack. 3) heat affected zone crack. and 4) root surface crack.
e) Figure 1 slunes the cTN·MN tiou of n well lrnd from a lurger engiurering part. Outline the most appropriate NDT techniques to deteet the listed defects before cross sectionuing the material: 1) weld metal crack, 2) toe crack. 3) heat affected zoue crack end fron a larger eigiueering and 4) root surface crackExplanation / Answer
Among all the non destructive testing methods to find weld defects, ultra sonicctesting vmcan be used to find all the above mentioned defects.
It utilises sound waves of ultrasonic frequency. This energy waves transmit through the specimen without energy loss, except at discontinuities or flaws. This uses a transducer and vibration is coupled to weldmen through a liquid applied over it. The velocity of sound is constant in a medium. If flaws or crack is detected, its details can be understood from reflecting amplitude. This method can be used to effectively fond the location of discontinuities.
In addition to ultrasonic testing, radiographic testing where 'rays are used for detection can also be used. Butvultrasonic testing is easy to be carried out.
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