Estudo do efeito de fluxos na soldagem ATIG de alumínio

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The feasibility of using ATIG (active flux TIG) welding for surface oxide removal in aluminum welding with direct polarity was evaluated. The influence of the flux on different conditions of specimen surface, variations in welding parameters and the effect of metal base composition was also evaluated. Welding trials were performed in a mechanized jig using a constant current power supply. Welding parameters were recorded using a digital data acquisition system. The fluxes were formed by fluoride, chloride or oxides, mixed with acetone. The flux was applied to aluminum specimen immediately before welding. Welding surface was observed using low power optical and scanning electronic microscopes, analyzed by an image processing software, and compared with welds performed with alternate current and no flux. It is proposed that changes in liquid metal movement inside the weld pool (Marangoni Effect) or differences between flux physical properties and metal causes variations in flux distribution that is retained on the weld surface. A simple flux elaborated with the zinc chloride diluted in acetone was the most effective to remove the alumina surface layer. The responsible mechanism for this flux activity was probably the dissolution of alumina by the flux during welding. The increase in the geometric parameters of the weld bead in aluminum and aluminum-magnesium can be associates with some interaction between the flux and the pool or between this and the electric arc

ASSUNTO(S)

engenharia metalúrgica teses.

ACESSO AO ARTIGO

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