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