Influence of heat input on the tensile properties of austenitic-ferritic welded joints

Introduction/purpose: During exploitation tests of gasoline storage tanks, cracks can form in an austenitic-ferrite welded joint, which compromise the entire tank. Methods: In order to obtain a joint satisfactory strength and durability, paper analyzes influence heat input on tensile characteristics joints. current literature practice, additional materials for welding tank elements are selected according chemical compositions basic materials, with help Schaeffler diagram. this paper, joints tanks examined, when largest part is made fine - grained microalloyed steel NIOMOL 490 K, while roof austenitic steel. Slabs these two were by MIG process material 18/8/6, at different amounts input. Conclusion: The analysis results obtained testing SRPS EN ISO 6892-1: 2020 standard concluded that behavior as whole depends properties each individual their mutual influence. It was also better if performed lower amount input, because then degree mixing achieved.