Efeito da camada de nitreto na porosidade em soldas de eixos automotivos / Effect of the nitride coat on porosity in automotive axles welding

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

In order to solve the occurrence of pores in weld beads of an automotive axle, the present work studies the influence of three different factors on the occurrence of porosity in joints welded by robotized GMAW process. The factors analyzed were: the presence of a region enriched by nitrides on the surface of the tube related to the base metal 1, the surface cleanliness of the joint components, and the shielding gas flow. Three samples of the weld bead transversal section were retired in each specimen. The porosity was quantified by metalographic analysis technique using an optical microscope. The results were presented by two different ways. In one of this ways, pores were quantified without any kind of distinction. In the other way, pores were grouped in accordance of their location in the weld bead transversal section. The pores quantified without any kind of distinction were affected by the ?presence of the coat? and by the shielding gas flow. The pores located near the joint root were affected only by the ?presence of the coat?. In addition to the experimental specimens, practical experiments were made in the axles line production. These practical experiments were developed to evaluate a proposed solution to prevent the occurrence of the pores on the weld bead of the axles. The results of these practical experiments proved that changing the compressed air used in the plasma cut of the extremities of the tube related to the base metal 1 by pure oxygen gas inhibited the pores formation

ASSUNTO(S)

porosity nitretos parts soldagem metais - defeitos eixos automotive axle welding porosidade automoveis - soldagem analysis automobiles aço - analise - soldagem steel nitrides automoveis - peças metals robotized welding automobiles welding defects

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