Análise da resistência mecânica e da fadiga de aço AISI 304 soldado pelo processo laser

Abstract

Manufacturing processes are innovating alongside the products and technologies being delivered by machinery and equipment manufacturers. Given this, the current challenge is to develop manufacturing processes that meet mechanical requirements and also have high productivity and provide a good finish to the products being applied. Welding manufacturing processes are separated into conventional and non-conventional manufacturing processes, therefore, this work seeks to evaluate the influence of the geometry of the welded joint in AISI 304 stainless steel when subjected to the laser welding process, which is considered a non-standard process. conventional manufacturing. The main objectives are to evaluate the influence of the joint configuration on its mechanical properties, as well as its resistance to fatigue when subjected to critical efforts. To develop the samples, AISI 304 stainless steel sheets were used, 3 millimeters thick and with welding powers of 900 to 1200 Watts. For the tested conditions, it is concluded that the autogenous laser welded joints - without root opening and metal addition - presented greater mechanical resistance, as well as a fatigue resistance of 42296 cycles, when subjected to loads of 70% of the maximum tension , as well as a lower standard deviation of microhardness values. The condition with root opening and filler metal presented resistance of 27201 cycles when subjected to the same previous conditions, as well as lower values ​​in other mechanical tests.