Efeito do teor de carbono do metal de base e da alma do eletrodo revestido sobre a porosidade em soldas molhadas

摘要

Porosity is a very common defect observed in underwater wet welding. Several researches have been developed to understand its formation mechanisms in order to mitigate the problem. The main objective of this project is to study the effect of base metal and core rod carbon content at weld metal porosity. Bead-on-plate were made on two different base metal carbon content (C2 - 0.1 wt. pct. and C7 - 0.7 wt. pct.) at 50 meters water depth, using commercial E6013 electrodes covered with varnish. Electrodes with different carbon content in core rod were used (E2 - 0.002 wt. pct. and E6 - 0.6 wt. pct.) in polarity negative (DCEN). Macrographic method (image analysis) was used to porosity quantification. Using the basic metals C2 and C7, it was observed that the porosity increased significantly with increasing core rod carbon content. In contrast, there was a reduction in porosity with increasing the base metal carbon content, using the electrodes E2 and E6.