Abstract
Effects of strength differences (mismatch) between weld metal and two base metals, as well as local variations of strength within weld HAZ zones, on the fracture toughness properties of welded joints were discussed. Due to high global weld joint mismatch, fracture deviation from CGHAZ into weld or base metal occurred. This event occurred in both weld joints provided on steels of equal and different strength level. Therefore, the result was not a correct measurement of HAZ fracture toughness. The significance of the local crack tip opening displacement measurement technique was also discussed by comparing the CTOD results of δ5 and British Standard δBS. Some differences in the two methods were discussed, in particular, for CGHAZ toughness weld joints provided on steels of equal and different strength level.
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