Abstract
The possibility of replacing the technological operation of direct heating in the furnace used in the process of production of steel welding wire for performing electrocontact heating to improve the quality of performed operations and improve the characteristics of the wire is considered. An experimental unit with a special arrangement of the electrocontact rollers with respect to the wire with the possibility of cooling is developed. Using the experimental unit of electrocontact heating, the mechanical parameters of the copper-plate welding wire are obtained for the technological route for production of wire with a diameter of 1.6 mm:– ultimate strength – 770÷850 N/mm2;– elongation – 5÷10 %.For the production of wire diameters of 1.2 mm:– ultimate strength – 700÷770 N/mm2;– elongation – 5÷10 %.These values satisfy the conditions for further wire processing and correspond to the requirements for the finished product.The effect of direct current heating on the formation of the structure and the change in the mechanical properties of the welding wire СВ08Г2С is shown, namely, it provides the necessary strength of the wire and prevents the formation of «work hardening». Work hardening causes the wire to break when the drawing mill is working. The use of automatic temperature control by adjusting the supply of current for heating the wire has made it possible to ensure homogeneity of the internal structure of the wire and to reduce the number of breaks by 80 %.
Highlights
The output of steel welding wire occupies 9–11 % of the total steel production in Ukraine [1, 2]
The production of a welding wire is performed by drawing steel wire to the required diameter at multiple drawing mills, followed by coppering the resulting wire in the final production operations [3]
A rational scheme for the arrangement of electrocontact rollers with respect to the wire is developed, which prevents the wire from slipping off the rollers as it moves and ensuring an even distribution of the tension forces of the wire when drawing
Summary
The output of steel welding wire occupies 9–11 % of the total steel production in Ukraine [1, 2]. To ensure the proper level of quality during the wire production process, namely – to prevent and reduce the number of breaks during drawing – an intermediate wire annealing operation of diameters of 2 mm and 2.5 mm is used At this transition, the drawing of steel wire to the required diameter before the reduction of copper due to the formed «work hardening» is accompanied by frequent breaks, the stops of the mills. The relevance of research is study of the application of an additional annealing operation to reduce the abruption probability This annealing will remove all internal stresses formed in the metal during the previous drawing, which will allow obtaining a homogeneous fine-grained internal structure of the wire
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