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The eomparative study of lhe eomposition, mierostrueture and meehanieal properties among weld metais with and without alloyed metal powder of High Strength Low Alloyed (HSLA) steel were done. Eight submerged are weld metais were made, using welding eurrent of 660A, are voltage of 34V, trave/ speed of 28,8 emlmin anda powder flow of 4,5 kglh. EM-12K and EB-2 wires and OK1071 and BX200 fluxes were used. The wire and lhe flux were alternated for eight weld metais. PD-3 al/oyed metal powder was used in four weld metais. The US/-SAC-50 steel was used in this work. The metallography, mierostrueture quantifieation and retained austenite quantifieation of eight weld metais were done. The weld metais without alloyed metal powder showed higher percentages of acicular ferrite and retained austenite. The mechanieal properties were obtained through tests of hardness, strength and impact. The weld metais without alloyed metal powder showed higher hardness and yield strength. From the results obtained, it was eoncluded that lhe retained austenite influenced on both depress of lhe upper shelf depressed for weld metais with low oxygen eontent and on lhe increase of the fracture appearance transition temperature (FA TT), when in higher percentages, in weld metais as-welded.

Efeito dos consumíveis no metal depositado com e sem adição de pó metálico em aço de resistência ambiental