Abstract
This research was carried out to obtain data on the application of the Izod test to non-alloyed weld metal. In general it was found that a good-grade refined weld metal, owing to its fine grain structure, behaves on Izod test much as an alloy steel hardened and tempered at say 650 deg. C. The extent to which the Izod value of such a weld is lowered by the presence of unrefined metal of any given depth was studied. To allow the start of the crack to be nearer than usual to the surface of the specimen, experiments were made on specimens with the notch depth reduced from 2 to 1 mm., the height of specimen required to give an equivalent result being determined for a good-grade refined metal. Results from specimens, both longitudinal and transverse, with notches at the various sides were compared, also the results from square and round specimens. A form of representative all-weld-metal specimen was devised that allowed the Izod results to be more truly representative of a test on a welded joint. The effect on the test result of varying the plate thickness, as well as the interval of time between the laying of the runs, was studied, also the effect of constraining the joint while being welded, some additional comparative experiments being made on rigidly constrained massive welds, chilled with water during deposition. The effect of a low-temperature annealing treatment on the Izod value was determined for several good-grade metals.
To obtain data on the liability for results to vary according to the temperature of the test house, tests were made on chosen grades of weld metal, completely refined and completely unrefined, in each of two states of heat treatment.
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