Усовершенствование технологии сварки роторной стали
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Дата
2018
ORCID
DOI
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
НТУ "ХПІ"
Анотація
Приводятся результаты усовершенствования технологии автоматической сварки роторной стали 25Х2НМФА, что позволяет улучшить качественные характеристики исходной структуры сварных соединений. Структура с улучшенными качественными характеристиками является достаточно важным элементом в данном процессе. Усовершенствование технологии предусматривает производить сварку стали на оптимизированных режимах, значения которых подбирали на основе данных моделирования сварочного нагрева. Показали, что реализация усовершенствованной технологии позволяет уменьшить величину аустенитных зерен на участках сплавления и перегрева зоны термического влияния сварных соединений.
Results of the improvement of the automatic welding technology of rotor steel 25X2NMFA are given, which allows improving the qualitative characteristics of the initial structure of welded joints. The problem of increasing the reliability and increasing the service life of welded joints of power equipment is becoming increasingly important. The performance characteristics of welded joints, to a large extent, are determ ined by their original structure. Improvement of the technology provides for welding steel in optimized modes, the value of which was selected on the basis of welding heat simulation data. It was shown that the implementation of the improved technology makes it possible to reduce the value of austenite grains in the areas of melting and overheating of the zone of thermal influence of welded joints. The structure with improved quality characteristics is quite an important element in this process. It was found that the use of heat treatment, namely, post-welding tempering, reduces the concentration of the constituent elements along the austenitic grain boundaries, which leads to an improvement in the quality characteristics of the structure and an increase in the mechanical properties of the welded joints. Improvement of the technology of automatic welding of samples of welded joints from rotary steel is possible by using welding heating simulation methods to obtain a structure with improved quality characteristics.
Results of the improvement of the automatic welding technology of rotor steel 25X2NMFA are given, which allows improving the qualitative characteristics of the initial structure of welded joints. The problem of increasing the reliability and increasing the service life of welded joints of power equipment is becoming increasingly important. The performance characteristics of welded joints, to a large extent, are determ ined by their original structure. Improvement of the technology provides for welding steel in optimized modes, the value of which was selected on the basis of welding heat simulation data. It was shown that the implementation of the improved technology makes it possible to reduce the value of austenite grains in the areas of melting and overheating of the zone of thermal influence of welded joints. The structure with improved quality characteristics is quite an important element in this process. It was found that the use of heat treatment, namely, post-welding tempering, reduces the concentration of the constituent elements along the austenitic grain boundaries, which leads to an improvement in the quality characteristics of the structure and an increase in the mechanical properties of the welded joints. Improvement of the technology of automatic welding of samples of welded joints from rotary steel is possible by using welding heating simulation methods to obtain a structure with improved quality characteristics.
Опис
Ключові слова
структура, механические свойства, моделирование, режим сварки, зона термического влияния, сварные соединения, rotor steel, technology, welding, structure, mechanical properties, modeling, welding regime, heat effect zone
Бібліографічний опис
Усовершенствование технологии сварки роторной стали / В. В. Дмитрик [и др.] // Вісник Національного технічного університету "ХПІ". Сер. : Інноваційні технології та обладнання обробки матеріалів у машинобудуванні та металургії = Bulletin of National Technical University "KhPI". Ser. : Innovative technologies and equipment handling materials in mechanical engineering and metallurgy : зб. наук. пр. – Харків : НТУ "ХПІ", 2018. – № 31 (1307). – С. 39-44.