Estudo comparativo entre arame sólido (ER70 - S6) e arame tubular metal-cored (E70C - 6M) utilizando processo de soldagem GMAW - curto-circuito controlado e GMAW - pulsado

Abstract

Solid wire welding (ER70S-6) is currently used in welding due to its easy assimilation, simplicity, repeatability, and low initial cost. Metal-cored wires (E70C-6M) can contribute to increased deposition rate and weld quality in controlled short-circuit and pulsed welding passes involving the same application. Although the initial cost of metal-cored wire is higher, the quality benefit offered by this consumable and the conditions for increasing the deposition rate should be considered, factors that can generate gains for the production process. In some situations, the existing rework rate occurs due to the difficulty of applying the solid wire (ER70-S6), which may affect the weld quality. It will be possible to extract information and comparisons about the final weld quality in the proposed study, by observing the laboratory results comparing the two wires, especially in controlled short-circuit welding processes, used for root passes, and pulsed welding in filler and finishing passes. The comparative study conducted, involving practical experiments using welding equipment, processes, and variables applied to test specimens, contributed to a more accurate understanding of this article. It explored technical evidence regarding the welding wire options mentioned and the results of metallographic analyses to better understand the welding results obtained.