The Mechanism of Under-Bead Microcracking in Nickel Alloy Weld Metals

概要

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Weld metals of nickel alloys are susceptible to microfisaire in underlying weld runs (under-head microcracking). Beads-on-plate cracking tests, hat ductility tests and weld thermal stress analysis were carried out to investigate the mechanism of this type of cracking. The obtained remits indicate flat (1) microcracking occurs in the previous weld runt reheated by the subsequent layer weld beads, and (2) abrupt-heating due to the subsequent layer bead causes high thermal elastic and plastic strains, and (3) the cracks farm in the heating process of a weld thermal cycle as a result of the plastic thermal strain exceeding the hot ductility of weld deposit.
社団法人溶接学会の論文
1986-04-01