Question

which scenario would most likely require radio-graphic testing (rt) instead of visual testing?
a examining weld beads on a practice coupon
b inspecting a weld in a pipeline buried underground
c checking for slag on the surface of a weld in a toolbox
d looking for an undercut in a welded trailer frame

Explanation:

• Option A: Weld beads on a practice coupon can be visually inspected, so RT is not needed.
• Option B: A buried pipeline's weld is not accessible for visual testing. Radiographic testing (RT) can detect internal or hidden defects without exposing the weld, making it suitable here.
• Option C: Slag on a weld surface in a toolbox is a surface defect, visible visually, so RT is unnecessary.
• Option D: An undercut in a welded trailer frame is a surface - related defect (undercut is a surface or near - surface defect in welding) and can be visually inspected.

Answer:

B. inspecting a weld in a pipeline buried underground