Abstract
Although current manufacturing methods result in highly reliable welds in ERW pipe, occasional small bond line defects, difficult to detect with present nondestructive test techniques, still are found. The development of improved inspection techniques to permit the detection of such small defects is a difficult undertaking. An Alternative approach toward increasing the reliability of ERW pipe is to insure that the weld region is able to tolerate the presence of any undetected defects without failure, that is, to insure that the weld has adequate ductility. Studies were conducted to determine why welds in some ERW pipes failed to show acceptable weld ductility as defined by the ratio of notched tensile strength (NTS) to unnotched tensile strength (TS), when all other observations indicated that the welds had good weld ductility.
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