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