Abstract
Creep rupture tests on three spherical vessels of aluminium killed mild steel have been carried out. The vessels were identical and each contained three unreinforced protruding nozzles. Two of the nozzles, of equal thickness, were attached with low hydrogen and rutile weld metal respectively. A third, thinner, nozzle was welded with low hydrogen electrodes. Two of the vessels were subjected to steady pressure, whilst in the third the pressure was relieved briefly at regular intervals.
In two of the vessels repairs were effected at failure and testing continued for an arbitrary period without further failure. The tests revealed that the life of all the vessels was limited by the integrity of the weld metal. Comprehensive measurements established the patterns of strains on the outside surfaces of the vessels. These strains supported current theoretical concepts.
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