On the welds near the active sensors S1, S6 and S7, no
evidence could be obtained that correlated the AE indications with the subsequent RT results, except for a few slag
inclusions of less than 1 mm size. These unrelated emissions, as shown in Fig. 7(c) and (d) , are considered in
several possible respects. First, they might have been due
to any defects that were below the subsequent RT resolution
limit. It is understood that the AE will detect the small
defects that are impossible to find by the normal NDE
techniques. Secondly, they could be related to any
defects on the tank floor to shell welds or tank floor,
which were not inspected by the subsequent RT because
of the geometrical complexity. Thirdly, they might be
produced by the sudden stress release due to local plastic
deformation of repaired welds, or fracture and decohesion
of small inclusions.
On the welds near the active sensors S1, S6 and S7, no
evidence could be obtained that correlated the AE indications with the subsequent RT results, except for a few slag
inclusions of less than 1 mm size. These unrelated emissions, as shown in Fig. 7(c) and (d) , are considered in
several possible respects. First, they might have been due
to any defects that were below the subsequent RT resolution
limit. It is understood that the AE will detect the small
defects that are impossible to find by the normal NDE
techniques. Secondly, they could be related to any
defects on the tank floor to shell welds or tank floor,
which were not inspected by the subsequent RT because
of the geometrical complexity. Thirdly, they might be
produced by the sudden stress release due to local plastic
deformation of repaired welds, or fracture and decohesion
of small inclusions.
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