Caracterización de uniones soldadas en carrocerías automotrices mediante análisis visual a capa galvánica.

Abstract

The purpose of this research was to analyze, using visual tools, the percentage of deformation and loss of the protective zinc layer in the bodywork sheets when using Mig-Brazing wire welding and compare its quality with oxyacetylene welding, commonly used in workshops. of artisanal body repair in Ecuador, for which the test sheets were subjected to saline solution, causing the corrosion to accelerate its process. To carry out the process, it was established to study the utilities of galvanization transformation in the presence of corrosion, subsequently the necessary equipment for welding with Mig-Brazing CuSi3 wire began to be detailed and finally the respective tests of welding on sheets were carried out. of car bodies with the Mig-Brazing CuSi3 wire and subjecting the welding bead to a corrosive process, to determine the percentage of removal of the zinc protective layer, a visual inspection analysis was carried out in which it was determined that the oxyacetylene welding The protective layer of zinc was released in greater quantity compared to Mig welding and a greater distinctive characteristic between both welds was evident. The evidence shows that the saline solution, by taking the sheets to a controlled corrosion process, could demonstrate the level of corrosion advancement between both welds. It was demonstrated that Mig-Brazing CuSi3 welding is efficient in avoiding bursting the zinc layer, preventing the base metal from oxidizing and providing long-term protection.

KEYWORDS: Deformation, sheets, welding, galvanization, corrosion, bodywork.