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