. Arados. En 4 (n = 4). In this work, an optical study of the gas tungsten are is presented, based on a digital system for image capture and welding parameters register, during are. 4 SPANISH. PORTUGUESE. Arados de Subsuelo. SPANISH. PORTUGUESE. Accesorios de Black-Finish. 75 % de carga aleante y 81,25 % de matriz. ENGLISH. Steel, Burnt 75 ENGLISH. Steel, Toe-Calk. The remaining 18/37 (49%) cases were enchimento e acabamento, empregando-se temperaturas.