Abstract
Weld metal yield strength mismatch may increase the structural integrity of welded components providing that a certain level of weld metal toughness is maintained. Based on this fact, the objective of this paper is to investigate the effect of filler wire selection on the fracture behavior of welded mild steel plates from the perspective of application temperature. Two types of flux-cored wire were used to buttweld mild steel base plates by semi-automatic CO2 gas shielded arc welding. Rectangular test specimens were extracted from the welded plates and a through-the-thickness center crack was fabricated along the weld line in each specimen. A uniaxial tensile load was applied perpendicular to the crack plane over a range of ambient temperatures and the fracture behavior was investigated using a combination of experimental techniques and elastic-plastic finite element analysis. The advantages offered by each weld metal were found to be temperature dependent, thus limiting their suitability to certain applications.
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