National Shipbuilding Research Program. Acceptance Standards for Nondestructive Test Not Required by Classification (Phase 2).

摘要

Current ABS requirements relative to nondestructive test and acceptance standards for radiographic and ultrasonic inspection are mainly intended for intersecting full penetration welds within the midship 0.6L, especially those in the sheer strake, bilge strake, deck stringer, keel plate, and butts in and about hatch corners in main deck and in the vicinity of breaks in the superstructure. At times, a shipyard may perform up to 100% nondestructive examination, at other locations, for the purpose of internal quality control or to satisfy a contractual agreement. Acceptance standards for locations that are beyond Classification Society requirements are not defined. The objective of Phase II was to determine the quality of manual welds made in the vertical position and additional automatic submerged arc welds made in the flat position, in ships that had proven satisfactory in service, and compare these results with those obtained in Phase I (automatic submerged arc welds made in the flat position). To accomplish this, ultrasonic examinations were made of side shell weld intersections in twenty ships built during the 1943- 1976 period.