Influence of the electrical current, upset force and tempering heat treatment in the flash butt welding of bimetal band saw blades / Influência da corrente elétrica, da força de recalque e do tratamento térmico de revenimento na soldagem topo-a-topo por centelhamento de serras de fita bimetálica.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The performance of bimetal band saw blades depends mainly on the features of joining their ends, carried out by flash butt welding process. This is a resistance welding method, which consists of electrical heating followed by a fast material forging. The present work has the objective of studying the influence of changing the electrical current, upset force and tempering heat treatment on the microstructures and mechanical properties of the flash butt welded joints. In this study, samples of bimetal band saw blades having width of 27 mm and thickness of 0.9 mm were employed. The material consists of a composite M42 high speed steel for the teeth welded together with a D-6a ultra-high strength carbon low alloy steel for the backer. The microstructure and mechanical properties have been investigated. It is pointed out that welding parameters and tempering affected the mechanical properties. The transversal hardness to the welding center line has shown values slightly higher than the respective longitudinal hardness. Non-tempered samples gave the highest tensile strength with the parameter of lowest tempering temperature. It is also found that the tempering reduces the hardness and the tensile strength of all samples.

ASSUNTO(S)

soldagem topo-a-topo weldability low alloy steels soldabilidade butt welding aços baixa liga

ACESSO AO ARTIGO

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