When stainless steels are heated in a temperature range of 500 ° C to 700 ° C, the carbon containing the steel reacts with the chromium to form chromium carbides that do not have the same characteristics as the alloyed chromium. These reactions deplete the steel and reduce its properties in the heated zone 1 . This research was focused on the determination of the influence of the temperature on the ZAT of a welding in stainless steel AISI 316, under GTAW process, welded with electrode ER316 when subjected to three ranges of pre-welding heating and its behavior before three different types of heat treatment. The methodological design was developed following a type of descriptive research where three samples of stainless steel were heated to three different temperature ranges and were soldered under parameters required by applicable codes. The welded samples were subjected to destructive and non-destructive tests to verify the quality of the weld and the presence of discontinuities and / or defects that could interfere in the performance of the material in operation; Afterwards, were subjected to metallography to quantify and analyze the presence of chromium carbides in the microstructure and their influence on the physical and mechanical characteristics of the ZAT and the welded joint. After the welding, the samples were submitted to three different types of thermal treatments where the effect of these in the dissipation of the carbides and improvement of the properties was studied.