Emprego de fios de Tungstênio como reforço de cordão de solda executado pelo processo GMAW

Abstract

Among the various permanent joining processes, welding has been gaining more and more space in the manufacturing and construction industries due to its versatility, efficiency and low cost, thus stimulating the development of new welding materials. Composite materials are presented as a viable possibility for innovations in soldering materials, bringing together advantageous characteristics of each of their constituents in order to present themselves as a possibility to meet the most varied applications in joints. In this work, the morphological characteristics and mechanical behavior of a metallic matrix composite (CMM) used as a welding material were studied, where the influence of the volume of continuous wires in proportions of 10, 20 and 30% was investigated. We chose to use the GMAW-MIG process due to its high productivity characteristics, but the technique was improved using tungsten wires in order to form a heterogeneous fibrous mixture composed of these wires as reinforcement to the filler metal in the weld pool. The results indicate that the addition of reinforcement wires contributed to a significant increase in tensile strength and modulus of elasticity, however a significant gain in hardness was also observed when compared to conventional filler metal from the E70S-6 electrode wire.