Análise e otimização de parâmetros na soldagem com arame tubular

Abstract

This work has the aim to analyse and optimise the influence of welding parameters on the geometric characteristics and production of a weld bead applied in a Flux Cored Arc Welding – FCAW- process. The process parameters investigated were welding voltage, wire feed rate, nozzle-to-plate distance, shielding gas, torch angle, and welding speed. As responses the penetration, convexity weld bead index and dilution were evaluated as the main geometric characteristics and the deposition rate and efficiency of the welding as production characteristics of the process. For this purpose statistical techniques were used to design the experiments runs and process the analysis. In the first phase, a Fractional Factorial was designed to select the most significant parameters influencing the process and in the second phase, a Full Factorial Design followed by a Response Surface Methodology in order to delineate the mathematical models and the influence of the main parameters on the response of the process. The results showed that wire feed rate had the most significant effect in the responses, followed by the welding voltage and the nozzle-to-plate distance. The welding speed was, among the parameters assessed, the least significative.