Исследование напряженно-деформированного состояния трубного узла мартенситной стали 15Х5М в процессе диффузионной сварки

Abstract

The important task of the engineering industry today is the use of reliable and at the same time inexpensive materials in the construction of oil and gas and refining equipment. Heat-resistant steels of martensitic class 15Cr5Мo belongs to the category of such materials, it has good strength and corrosion resistant feature – at high temperatures and simultaneous with low cost The peculiarity fabrication of pipe spools and other basic elements of steel petrochemical equipment of 15Cr5Mo, includes accompanying pre-heating and the immediate and subsequent heat treatment of the a strict observance of temperature and time parameters of the process. These activities are carried out in order to remove residual welding stresses and to prevent cold cracking during welding and make the process of making the steel 15Cr5Mo the basic elements energy-intensive and time-consuming, and in some cases impossible to make basic elements. Therefore, one of the modern trends of technology modernization welded oil and gas processing equipment from martensite steels is an elimination from the traditional techniques of arc welding. This paper presents the results of numerical modeling of diffusion welding of a pipe spool made of martensite steel 15Cr5Mo. The analysis of stress and strain state in a welding joint under the conditions of diffusion welding process is carried out, on the basis of which the possibility of diffusion welding of a pipe spool made of martensite steel 15Cr5Mo is shown without buckling of pipe billets. The calculation of temperature fields, stress and strain fields of a welding joint is made.