Abstract
Regarding welded constructions, not only their strength is of interest, but also saving of the weld metal consumption. For the latter, constructive faulty fusion of the joint can be used. But such joints suffer from stress concentration at the faulty fusion tip. When high-strength steels are used, this may lead to brittle or quasi-brittle failure, even under low loads. To raise the failure resistance power of fillet welded high-strength steels with the constructive faulty fusion, it is suggested to use a composite weld, where the root pass is made with a ductile (soft) welding rod and the rest of the passes with a high-strength (hard) one. Results of the study of stress-strain state and fracture resistance of mechanically heterogeneous fillet joints are presented, and the effects of fillet's bevelling geometry and ratio of mechanical properties of the hard and the soft weld rod metal are analyzed. The stress-strain state was studied using finite element method (FEM). FEM calculations and experiments with real weld joints demonstrate that the joint strength may be raised and expensive austenitic weld rods may be saved at the same time if composite joints are used in making fillet weld joints of high-strength steels with constructive faulty fusion.
Highlights
МКЭ-расчёты и эксперименты на реальных сварных соединениях показали, что применение композитных швов при изготовлении угловых сварных соединений высокопрочных сталей с непроварами позволяет повысить их несущую способность при одновременной экономии дорогостоящих аустенитных электродов
To raise the failure resistance power of fillet welded high-strength steels with the constructive faulty fusion, it is suggested to use a composite weld, where the root pass is made with a ductile welding rod and the rest of the passes with a high-strength one
finite element method (FEM) calculations and experiments with real weld joints demonstrate that the joint strength may be raised and expensive austenitic weld rods may be saved at the same time if composite joints are used in making fillet weld joints of high-strength steels with constructive faulty fusion
Summary
МКЭ-расчёты и эксперименты на реальных сварных соединениях показали, что применение композитных швов при изготовлении угловых сварных соединений высокопрочных сталей с непроварами позволяет повысить их несущую способность при одновременной экономии дорогостоящих аустенитных электродов. Для соединений высокопрочных сталей непровар опасен с точки зрения возникновения хрупких и квазихрупких разрушений при низких уровнях прикладываемых нагрузок. Для прогнозирования прочности сварных соединений использовали экспериментально-расчётный метод [2]. Что как только напряжение в контрольном элементе достигнет критической величины σ1кр, произойдёт страгивание трещины из вершины непровара.
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