احمد میری

In this research, dissimilar joints between copper and stainless steel 316by gas-tungsten arc welding using copper and monel filler metals and also the similar welding of steel 316 have been investigated. The microstructure was studied by OM, SEM and EDS. Tensile and impact tests were done to evaluate the mechanical properties. In order to investigate the sigma phase formation, the specimens were heat treated. The microstructure of the dissimilar welds contained an iron rich and a copper or monel phase. After heat treatment, no sigma phase was observed in the dissimilar joint that it seems that the presence of copper and nickel as an austenite stabilizer elements in the microstructure prevents the sigma phase formation.

Among successful studies expounding the mechanism of narratives, one could mention Todorov’s method and analysis in studying folktales. First on the basis of logical relationship of structural units, he differentiates between two kinds of narrations: mythological narration and ideological narration. By describing the features of mythological narration, he attends to this narratology from different aspects. Todorov, by discovering the structure of this kind of narration, has put forward his universal grammar theory. This article along with analyzing and studying Haft-Peikar, studies the narratologystructure of this work in two aspects: adjectives and verbs. It is evident that discovering the structure of this work will guide us in discovering the structure of similar works and understanding the universal grammar theory.