Conditions of Possible Application of Vibration Processing in the Course of Welding

Abstract

Enough works in which positive action of the vibration fluctuations imposed both in the course of welding of a design and after it is specified are known. In the article features of influence of low-frequency vibration fluctuations in the course of a welding cycle on properties of welded connections from steel A 516-55 are considered. The conducted pilot studies of influence of vibration influence of a welding bathtub in the course of welding on structure and physico-mechanical properties of metal of welded connections have allowed to prove positive action of this technology which leads to increase in durability and fatigue endurance of welded connections. This fact will allow to expand using of technology of vibration processing in the course of welding for production of the welded equipment of various type.

Welding Technology for Liquefied Natural Gas Tanks

“…Optimum parameters of 9% nickel steel are achieved by very precise temperature control during production and controlled quenching. Preheating is performed only if high humidity is condensed on parts or welding works are carried out at temperature below 5 ° C [1,[16][17][18][19].…”

“…Although studies have been carried out with suitable welding materials for welding these surfacings, it has now been proven that only nickel-based consumables meet the physical and mechanical requirements. This article will provide a more detailed description of the composition of 9% nickel steel, nickelbased welding materials and welds for chemical composition, heat treatment, mechanical properties, physical properties, international specifications and project requirements for LNG tanks [1][2][3][4][5][6][7][8][9]. Some practical recommendations and examples of recent projects on welding of 9% nickel steel by arc welding and arc welding under flux will be presented.…”

Study of the effect of the annular gap between the kta housing and the transverse segment partitions on the heat exchange efficiency

“…Heat exchangers of technological installations significantly affect the efficiency and reliability of the installation as a whole. A decrease in the reliability of heat exchangers of technological installations (condensers, reboilers) can lead to a significant decrease in the efficiency of the installation [1][2][3][4][5][6][7]. Failures in the operation of heat exchangers almost always lead to a decrease in the technical and economic indicators of the installation.…”

Prevention of local corrosion of aluminum alloy pontoons in steel tanks

“…The current task in the field of materials science and corrosion theory is considered to be the study of aluminium alloys widely used in the oil and gas industry [1][2][3]. In order to find technical solutions to prevent local corrosion of aluminum alloy floats during hydraulic tests, it is necessary to analyze the conditions and causes of pittings and ulcers on the surface of samples of aluminum alloys under the influence of water of various compositions, and then determine corrosion rates and propensity for pitting aluminum alloys in water electrolytes [4][5][6][7].…”