Accession Number:

AD0600935

Title:

PRELIMINARY EXPLOSION-BULGE TESTS OF EXPERIMENTAL HY-130/150 WELDMENTS.

Descriptive Note:

Technical rept.

Corporate Author:

UNITED STATES STEEL CORP MONROEVILLE PA

Personal Author(s):

Report Date:

1964-04-01

Pagination or Media Count:

28.0

Abstract:

The results of the explosion tests showed that the base metal and the high-toughness MIG weldments underwent extensive plastic flow 3 explosive shots without fracture. For the lower-toughness, covered-electrode weldments, the three crack-starter weldments and three of the six bulge weldments fractured in 3 or less shots. All fractures initiated in the weld metal and propagated primarily in the weld metal however, in several specimens the weld-metal cracks propagated as short tears in the base metal. Three of the six coveredelectrode weldments withstood 3 shots and exhibited extensive plastic flow without fracture. The weldments that did not fracture were reduced in thickness by about 6 percent, a thickness reduction similar to that of the base-metal plate. The explosion tests showed that experimental HY-130150 weldments can be fabricated that will undergo extensive plastic flow during explosive loading without fracture. However, a tougher covered-electrode weld metal will be required to markedly reduce the probability of fracture during explosive straining. In addition the development of HY-130150 filler metals must be continued so that the best performance observed in the present tests on 1-inch-thick weldments, which were welded in the flat position with a 200 to 300 F preheat, can be obtained on heavier, more highly restrained submarinehull weldments, which must be fabricated by out-of-position welding and preferably with a lower preheat. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE