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This paper shows that, in the temperature transition regime, scatter of weld metal and heat-affected zone toughness values is related to material heterogeneity in the welded joints. Results were obtained from impact testing of V-notched and fatigue-cracked Charpy specimens as well as from static fracture toughness tests on small-scale and full-thickness specimens. Besides material heterogeneity, mechanical heterogeneity is emphasized as having a significant influence on the fracture performance of heat-affected zone specimens.
weldments, welded joints, weld metal, heat-affected zone, heterogeneity, impact toughness, fracture toughness
Research engineer, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,
Head of section, Materials and Component Assessment, Fraunhofer-Institut für Werkstoffmechanik, Freiburg,