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The purpose of this paper is to review the effects of weld metal overmatching on weld joint behavior. The notch toughness parameters crack-tip opening displacement (CTOD) and crack opening displacement (COD) are used to evaluate the degree of weld metal overmatching on weld joint performance. Exploratory experimental work on wide-plate specimens loaded in tension is presented to support the theoretical observations.
It is concluded that weld metal overmatching has a beneficial effect on the overall performance of transversely loaded welded joints loaded in tension. The results also indicate that the CTOD bend test gives mainly an idea about the local notch tip ductility and that, if a “fitness for purpose” evaluation is to be based upon the small-scale CTOD test, the benefits which accrue from the use of overmatching weld metal on tolerable defect size cannot be described adequately by the design curve approach.
overmatching, weld metal, crack-tip opening displacement (CTOD), gross section yielding, CTOD design curve, weld joint
Lecturer and manager, State University of Gent, Gent,