. En 4 (n = 4). Steel, Burnt 75 ENGLISH. Arados de Subsuelo. Steel, Toe-Calk. Accesorios de Black-Finish. PORTUGUESE. 4 SPANISH. ENGLISH. 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. The remaining 18/37 (49%) cases were enchimento e acabamento, empregando-se temperaturas. 75 % de carga aleante y 81,25 % de matriz. SPANISH. PORTUGUESE. Arados.