Özet:

3Cr12 ferritic stainless steels exhibit corrosion resistance performance intermediate between structural steels and austenitic stainless steels and are known for mechanical properties close to structural steels. In this study, the welded joint performance of 3Cr12 ferritic stainless steel materials joined with different addition wires was investigated. In the study, ER308LSi, ER309LSi and ER316LSi welding wires were used as additional wires and joined by the gas arc welding method. No errors were observed in the visual inspection performed after the joining process. Macrostructure and microstructure examinations were performed to determine the structural characterisation of the specimens, and tensile, hardness and bending tests were performed to determine the mechanical characterisation. In macro studies; weld metal (WM) and heat affected zone (HAZ) can be clearly distinguished. There are no defects such as gaps, cracks and lack of penetration that could negatively affect the weld quality and mechanical properties. In micro examinations, structural changes and the melting-solidification line between WM and the base metal were clearly identified. In tensile tests, the % elongation, yield and tensile strength values of the joints made with ER308LSi wire showed slightly better results than the joints made with other wires. In hardness tests, average hardness values were measured as approximately 150 HV in the base metal, 300 HV in HAZ, and 190 HV in WM. In bending tests, it was determined that welded joints exhibited approximately as much ductility as the material.

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