39 Other: Drop Weight Test

The drop weight test is a more reliable method than the Charpy V-notch test for measuring nil-ductility transition (NDT).

Cracking of the weld bead is initiated at 3° of bend. After that point, the weld bead continues to crack, which initiates a fracture in the plate. To ensure the strain induced in the plate is elastic, a stop is placed below the weld bead. The stop limits the amount of deflection of the plate to 5° of bend.