In the modern productive system, welding has become an alternative and an important substitute for mechanical joining processes, such as screws and rivets. Oxidation is defined as a phenomenon in which a material progressively deteriorates when exposed to varying environmental conditions, such as a contaminated industrial atmosphere. The purpose of this work is to propose a study on interference due to induced corrosive processes that may occur in the weldability of ASTM A36 steel sheets, comparing two different welding processes, namely SMAW - Shielded Metal Arc Welding and GMAW - Gas Metal Arc welding. In this way, reference specimens were listed, stored in air, compared to others stored in a corrosive environment during a pre-established period of time. The masses of the samples were measured before and after packaging, so that the corrosion rate in them could be measured. In order to check cracks and surface discontinuities in the welded joints, visual tests and the application of penetrating liquid were carried out. They were also subjected to a hardness test across the applied cord so that their variation could be measured. In this way, through the analyzes carried out, it was possible to observe, during the welding, a worsening in the weldability of the samples. The degree of oxidation of each sample directly affected the quality of the welding process used. The number of defects related to the welding process, such as discontinuities and weld spatter, increased as the exposure time of the samples also increased.