ResumoUm estudo visando à caracterização metalográfica e metalúrgica foi realizado em um aço ARBL (alta resistência e baixa liga) tipo X80, soldado com o processo arame tubular (FCAW) robotizado, com três diferentes níveis de energia de soldagem. Para tal foram utilizadas técnicas de metalografia óptica e microdureza Vickers (Hv). Foram depositados cordões de solda em forma de camadas sobre chapas do aço X80, variando a energia de soldagem e sem pré-aquecimento, no estado como soldado. Os resultados mostram que a técnica de sobreposição utilizada, com baixa e média energia de soldagem, não foi suficientemente adequada para melhorar as propriedades metalúrgicas dos cordões depositados anteriormente, inclusive da ZTA do metal de base.Os cordões depositados com alta energia de soldagem promoveram crescimento do tamanho de grão da GGZTA do aço X80 com a consequente diminuição da resistência ao impacto.Este trabalho da subsídios para uma melhor compreensão das soldas multipasses. Palavras-chave: Aço X80; Soldagem com arame tubular; Caracterização metalográfica; Teste de impacto. METALLOGRAPHIC CHARACTERIZATION OF WELDS DEPOSITED IN LAYERS ON STEEL HSLA X80 USING THE ROBOTIZED WELDING PROCESS WITH FLUX-CORED WIRE AbstractA study to characterized metallographic and metallurgical was performed on HSLA (High Strength Low Alloy) steel X80 type, welded with robotized process with fluxcored wire (FCAW) with three levels of welding energy. For this, it was used techniques of optical metallography and Vickers hardness (Hv). Were deposited weld beads in the form of layers on X80 steel plates, varying the welding energy and without preheating in the as-welded condition. The results show that the overlay technique used to form the solder layers with low and medium energy welding was not enough to improve the metallurgical properties of previously deposited beads including the HAZ. For beads deposited with high welding energy there was a marked growing of the grain size in the HAZ which affect the impact resistance of the HAZ. This work gives subsidies for a better comprehension of the multipass welds.
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