Page 325 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 94 : Assess Ultrasonic Flaw detector-
application on weldments

Objectives

At the end of this exercise, you will be able to
• understanding ultrasonic testing
• types of ultrasonic waves
• process of ultrasonic testing
• ultrasonic testing of welds.
• ultrasonic testing in welding for thickness detection
• advantages of ultrasonic testing.

Job Sequence

- Ultrasonic Testing (UT) emerges as a vital tool in the arsenal of non-destructive testing techniques as it ensures
the quality and integrity of weld joints.
- This method allows for the detection of defects and irregularities within welds, helping to prevent potential
failures that could have serious consequences.

- Ultrasonic Testing involves the use of ultrasonic sound waves to detect defects inside a material.
- The welded joints have the possibility of defects inside the welds or somewhere near the weld zone.
- The few defects that are often found in welds are Porosity, Cracks, Slag Inclusion, Lack of fusion, Lack of
Penetration, Root concavity, Crater pipes, sharp undercuts, burn-through, HAZ cracks, and much more.
- These defects are located deep and cannot be viewed manually; ultrasonic scanning is used to detect these
discontinuities. The conventional Ultrasonic Testing of weld joints method shown here is totally operator-reliable.

- Therefore, international bodies require the operator to be qualified as per a standard, and the machine used
also meets the requirements.

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