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Caracteriza??o do cord?o na soldagem FCAW com um srame tubular rutílico

DOI: 10.1590/S0104-92242009000400004

Keywords: fcaw process, rutilic tubular wire, weld bead shape, microstructure.

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Abstract:

this paper studies the effect of operational conditions on bead shape characteristics in fca welding with a brazilian made wire with rutilic flux (asme sfa-5.20: e71t-1/e71t-9/e71t-9m) of 1.2mm diameter. bead-on-plate downhand welding trials were performed on 12mm thick low carbon steel plates with a constant voltage power supply. a digital data logging system was used to measure the welding current and voltage, and wire feed rate. while the shielding gas composition (75%ar-25%co2 and 100%co2), wire polarity and feed rate (7 and 9m/min) were varied during the trials, the electrode extension (16mm) and arc length (3.5mm) were not changed. weld bead characteristics (penetration depth, width, and fused and deposited areas), the presence of discontinuities, bead microstructure and hardness were evaluated. welding conditions of high productivity (high deposition rate) associated to adequate bead characteristics were determined for the wire.

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