REVIEW OF THE EXISTING METHODS OF IMPROVING THE STRENGTH OF WELDED JOINTS. (PART II. APPLICATION OF ELECTROMAGNETIC FIELDS IN WELDING AND RELATED PROCESSES)

D. G. Nosov, V. V. Peremitko, I. V. Kolomoyets, Y. S. Taran, S. S. Chernenko

Abstract


The work is connected with studying of the mechanical characteristics’ of the weld metal dependence on the influence of external factors, such as a external magnetic field, at the stage of crystallization and the presence of defects of the formed weld. Successful solving of joints’ quality control problems obtained by fusion welding requires the development of methods and means of active influence on this welding process’ stage. In the work the analysis of scientific and technical information of existing methods of welding production for increasing the strength of welded joints is performed. The occurrence of major defects in the cast structure of joints, which reduce the service properties of welded joints, occurs at the stage of crystallization of liquid metal in the weld bath is established. Using of liquid metal’s forced mixing in a welding bath in order to supplement the natural forms of melt movement, which improve mass transfer and control the thermo-concentration processes that determine the structure and properties of welds by means of MF, is justified and is practically feasible. Reversing of the of electromagnetic fields’ action (ponderomotor forces in the melt) leads to periodic transverse movement of the melt from the tail of the bath to the axis of the joint. The achievement of maximum efficiency using the influence on mechanical characteristics of welded joint in each case by choosing the parameters of technological processes and equipment using the additional electromagnetic effect is shown.

Keywords


electromagnetic effect; cross electromagnetic mixing; increasing of welded joints’ strength; magnetic control; longitudinal; cross; combined magnetic fields; grinding of the join processing welds; ponder-motor forces; head and tail part of the bath

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DOI: https://doi.org/10.31319/2519-2884.36.2020.6

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Copyright (c) 2020 D. G. Nosov, V. V. Peremitko, I. V. Kolomoyets, Y. S. Taran, S. S. Chernenko

ISSN (print) 2519-2884

ISSN (online) 2617-8389