OBRABOTKAMETALLOV Vol. 26 No. 3 2024 305 EDITORIAL MATERIALS joints of 09G2S steel obtained by welding with direct current and pulsed low-frequency current modulation under conditions of positive (+ 20 °C) and negative (-45 °C) ambient air temperatures are investigated using three new types of welding electrodes. The methods of investigation. Mechanical tests for static tension and impact bending of welded samples, as well as spectral analysis of the chemical composition and metallurgical studies of weld metal are undertaken. Results and Discussion. It is revealed that the metal constructions operational factors depend on the choice of the welding method and welding temperature, as well as the characteristics of the welding material. It is established that to increase the impact strength of samples welded at negative temperatures by the adaptive pulse-arc welding method, an increase in heat input is required, relative to the rat of energy input, realized in the process of welding at positive temperature. The eff ect of the weld metal structure refi nement using adaptive pulse-arc welding with coated electrodes is confi rmed, including in conditions of negative ambient air temperature (down to 45 °С below zero). The presented results confi rm the prospects of the developed approach aimed at obtaining new classes of materials and products, intended for operation in the conditions of the North and the Arctic. ______________________________________________________________________________________________________ Introduction The “Introduction” section should be used to defi ne the place of your work (approach, data or analysis) (up to 1.5-2 pages). It is understood that there is an unresolved or emerging scientifi c problem that is being addressed in your paper. In this regard, this section should provide a suffi ciently informed (with evenly distributed references to sources) literature review on the state of the indicated problem. Most of the links should be given in this section! At the end of the “Introduction” section, the purpose of the work is formulated and the tasks are indicated, the solution of which will allow achieving the set goal. There is no need to write about a specifi c result in this section, since there is a corresponding section in the structure of the paper. METHODS / METHODS OF RESEARCH Theory (for theoretical works) or Experimental technique (for experimental works). One should avoid repetitions, unnecessary details and known provisions, detailed derivations of formulas and equations (give only the fi nal formulas, explaining how it was obtained. 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Control by comparison with commonly known solutions and verifi cation by comparison with experimental data are mandatory. Discussion Use this section to fully explain the signifi cance of your approach, data or analysis and results. This section organizes and interprets the results. The purpose of this section is to show what knowledge has been gained as a result of your work and to show the perspective of the results obtained by comparing it with the current situation in this area described in the “Introduction” section. A large number of graphs and color illustrations do not give a scientifi c result. It is the responsibility of the author to
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