Abstract
In the production of welded spans of railway bridges since the 70s of the last century, low-alloy structural steels are used. In these constructions in recent years there has been an intensive growth in the formation of fatigue cracks. Currently, the only technology used by Russian Railways for braking fatigue cracks is to drill a hole in the mouth of a crack, followed by setting a high-strength bolt into it and tightening it to a standard force. At the Siberian Research Institute of Bridges (Siberian Research Institute of Bridges SGUPS), innovative technologies have been developed to inhibit the growth of fatigue cracks and strengthen welded spans using soldering and induction heating. Technology has proven effective. It is known that heating a metal to high temperatures can significantly change its structure and characteristics. In the scientific literature there are no data on changes in the strength characteristics of low alloy structural steels as a result of rapid heating. In a laboratory study, an analysis was made of the change in the strength characteristics of low alloy structural steel with rapid induction heating. Studies of structural steel samples showed that quick short-term induction heating of structural steel to the temperature of brazing does not lead to a significant change in its strength characteristics, and brazing and induction heating can be used to strengthen structures with fatigue cracks.
Highlights
In the production of welded spans of railway bridges since the 70s of the last century, low-alloy structural steels are used. In these constructions in recent years there has been an intensive growth in the formation of fatigue cracks
The only technology used by Russian Railways for braking fatigue cracks is to drill a hole in the mouth of a crack, followed by setting a high-strength bolt into it and tightening it to a standard force
At the Siberian Research Institute of Bridges (Siberian Research Institute of Bridges SGUPS), innovative technologies have been developed to inhibit the growth of fatigue cracks and strengthen welded spans using soldering and induction heating
Summary
Исследование влияния индукционного нагрева на прочностные характеристики стали 10ХСНД. При производстве сварных пролетных строений железнодорожных мостов с 70-х годов прошлого века применяются низколегированные конструкционные стали. В настоящее время единственной технологией применяемой в ОАО «РЖД» для торможения усталостных трещин является высверливание отверстия в устье трещины с последующей постановкой в него высокопрочного болта и затяжкой его на нормативное усилие. В Сибирском научно-исследовательском институте мостов (СибНИИ мостов СГУПС) разработаны инновационные технологии торможения роста усталостных трещин и усиления сварных пролётных строений с применением пайки и индукционного нагрева. В лабораторном исследовании был выполнен анализ изменения прочностных характеристик низколегированной конструкционной стали при быстром индукционном нагреве. Исследования образцов из конструкционной стали показали, что быстрый кратковременный индукционный нагрев конструкционной стали до температуры пайки не ведет к существенному изменению ее прочностных характеристик, и пайка и индукционный нагрев могут применяться для усиления конструкций с усталостными трещинами. Издательство «Мир науки» \ Publishing company «World of science» http://izd-mn.com
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