Abstract
AbstractThe aim of the present work is to examine the yield strength mismatch between the weld metal and the base metal, which affects the deformation and fracture behaviour of welded joints. Specimens prepared from SAE 1020 steel plates were welded using three rutile covered electrodes having different tensile strengths. Fracture toughness of the welded zones was investigated based on the behaviour of cracks caused by fatigue. The mechanical properties of the weld metal and heat affected zone (HAZ) were examined, and graphs were obtained to compare crack progress values Δa (mm) and welding material toughness J (N mm-1), which is a fracture mechanics parameter. Microhardness investigation was carried out on the weld metal, base metal, and HAZ transitions via measurements along lines on four different zones of the specimen. Micrographs of the specimens were also taken.
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