CWI NDE Methods and Symbols Questions and Answers

Question 1

A welding blueprint has a symbol in the tail of the reference line that reads 'UT'. This indicates that the weld requires which of the following?

Accepted Answer

Ultrasonic Testing to detect internal and sub-surface discontinuities.

Answer

Visual Testing to check for surface discontinuities.

Answer

Magnetic Particle Testing to find near-surface defects in ferromagnetic materials.

Answer

Radiographic Testing to create a film image of the weld's internal structure.

Question 2

A CWI is reviewing a welding procedure for a critical application on a non-ferromagnetic stainless steel component. The procedure calls for an NDE method to detect fine surface-breaking cracks. Which of the following methods would be most appropriate and effective for this specific scenario?

Accepted Answer

Dye Penetrant Testing (PT)

Answer

Magnetic Particle Testing (MT)

Answer

Visual Testing (VT) with 5x magnification

Answer

Radiographic Testing (RT)

Question 3

On a welding symbol, where is the information specifying the length and number of NDE examinations to be performed typically placed?

Accepted Answer

In the tail of the reference line

Answer

To the left of the weld symbol

Answer

Above the reference line

Answer

Below the arrow

Question 4

Which of the following NDE methods has no arrow side or other side significance when its symbol is placed on the reference line of a welding symbol?

Accepted Answer

Radiographic Testing (RT)

Answer

Visual Testing (VT)

Answer

Magnetic Particle Testing (MT)

Answer

Dye Penetrant Testing (PT)

Question 5

A fabrication drawing for a carbon steel pressure vessel shows the NDE symbol 'MT' placed below the reference line with '(4)' written in the tail. What does this specify?

Accepted Answer

Perform four separate Magnetic Particle tests on the arrow side of the joint.

Answer

Perform Magnetic Particle testing on the other side of the joint for a length of 4 inches.

Answer

Perform Magnetic Particle testing on the arrow side of the joint using a 4-inch prod spacing.

Answer

Perform four separate Ultrasonic Tests on the other side of the joint.

Question 6

Which of the following is a significant limitation of Magnetic Particle Testing (MT)?

Accepted Answer

It is ineffective for detecting discontinuities that are not oriented favorably to the magnetic field.

Answer

It is only effective for detecting surface-breaking discontinuities.

Answer

It can only be used on non-ferromagnetic materials.

Answer

It requires the use of ionizing radiation, posing a safety hazard.