Influência da frequencia de pulso da corrente na soldagem TIG autógena sobre a microestrutura e propriedades do aço inoxidável austenítico AISI 316L

Abstract

The aim of this study is to evaluate the effect of pulse frequency of the current on the microstructure and properties of AISI 316L stainless steel thin plates. Thin plates of the steel were welded by the TIG autogenous welding process with pulsed current. The welds were made varying the pulse frequency from 2 to 8 Hz, maintaining constant the welding energy. The welding parameters were selected to obtain complete penetration. Analyses of surface features were made. The microstructure of the cross section was evaluated by optical microscopy and scanning electron microscopy. The mechanical properties evaluation was done by uniaxial tensile testing, hardness and bending. The results have shown that variations in pulse frequency did not act in order to confer improvement on mechanical properties of the welded joints.