When should an NDT designation be centered on the reference line?

When should an NDT designation be centered on the reference line?

• A. When the same NDT is to be performed on both sides of the weldment.
• B. When there is no side significance.
• C. When the NDT is to be performed in the center of the weldment.
• D. When the direction of the NDT source is not important.

Answer: (B)

In NDT welding symbols, where the designation sits in relation to the reference line shows whether there is side significance. If there is no side significance, the designation is centered on the reference line to indicate the test applies to the weld as a whole, regardless of which face is examined. When a specific side matters, the symbol is placed on the side of the reference line that corresponds to the face being inspected, signaling that the evaluation is limited to that side. So centering the designation on the reference line is the correct approach when there is no side significance.

In NDT welding symbols, where the designation sits in relation to the reference line shows whether there is side significance. If there is no side significance, the designation is centered on the reference line to indicate the test applies to the weld as a whole, regardless of which face is examined. When a specific side matters, the symbol is placed on the side of the reference line that corresponds to the face being inspected, signaling that the evaluation is limited to that side. So centering the designation on the reference line is the correct approach when there is no side significance.