PSI - Issue 11

Hizadora Constanza Medina D’Ambros et al. / Procedia Structural Integrity 11 (2018) 114–121 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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Fig. 8. Tensile strength results of samples E-REF, E-HIGH, E-LOW, E-SLAG and E-MOIST.

The E-REF samples show the large value of steel ultimate tensile strength and steel yield strength above all the other samples. The E-LOW and E-MOIST presented the smaller value of steel ultimate tensile strength (14,35% and 10,03% below E-REF sample, respectively). The fact repeat for the steel yield strength values, in this case E-LOW and E-MOIST samples present values 12,77% and 7,11% below E-REF sample. In both characteristic property of steel the E-SLAG and E-HIGH samples show less than 3% difference from the EREF value. This results associated with the visual analyses indicate the E-LOW and E-MOIST samples as the most effected by the simulated conditions. Both are workmanship defect where the skills of the welder have not matched the demands of the weld configuration (Hicks, 2000). The use of appropriated amperage and the correct storage of the electrode are the preventive measure indicated for avoid weld with the same aspects of E-LOW and E-MOIST samples. In this work an experimental program was carried out to measure the damage of of welded joints pathologies identified at water elevated reservoirs in the state of Tocantins, Brazil. The visual analyses determine the presence of pathologies related to slag inclusions, high and low welding amperage and also moist welding electrodes indicated by the defects present in weld joint. The samples intentionally welded with pathologies show similar defects to those identified at the water elevated reservoirs. The tensile strength results evidence significant loss of resistance and the in large number of defects in samples with low welding amperage and moist welding electrodes. Those damages were identified as workmanship defect, and then is recommended the improvement of welder technique which must necessarily include the capacitation of welder in order to adequate the materials, equipment and the welder ability to the weld configuration. Acknowledgements Hizadora D ’Ambros acknowledge the Civil Engineering Tutorial Education Program of Federal Institute of Education, Science and Technology of Tocantins (PET Civil IFTO) funded by the Ministry of Education of Brazil. The authors acknowledge the Civil Engineering Laboratory of Educational Lutheran Association of Brazil. 4. Conclusions