Otimização de um processo de solda MIG/MAG para aplicação na indústria automobilística através da utilização da técnica do projeto e análise de experimentos

Abstract

This work was developed in order to propose a welding GMAW optimise mathematical model in a company who manufactures heavy truck and buses wheels in low carbon steel. This optimisation was achieved by Design of Experiments application, using the Response Surface Methodology technique. The experiment had 31 welding runs and it was used standard tubeless wheels, which is the most popular model in internal and export market. The input parameters (voltage, current, longitudinal angle and welding speed) were chosen by literature review and process characteristics and constraints, as well as the quality bead improvement added production cycle and wire rate decrease. The responses (rim and disc penetration, convexity index, base angle and welding area) were determined based on the weld bead internal specifications and economic aspects. The final mathematical models show, in a general way, that all input parameters (isolated or combined) have influence in the responses studied. Therefore it was possible to obtain the total process optimisation based on technical and economics approaches.