Steel wire connecting method

Abstract

The invention discloses a steel wire connecting method, and provides a steel wire connecting method capable of preventing end breakage of a welding position during a drawing process, and reducing end breakage rate. The method comprises the following steps of: clamping a polished welding seam at a tempering jaw, and raising the temperature intermittently for 4-5 times, with 1-2 seconds of interval between every two temperature rises, and stopping temperature rise when reaching 750-820 DEG C; continuously raising the temperature to 750-820 DEG C when naturally cooling to the temperature of 650 DEG C in the air, stopping temperature rise, repeating the above cooling-raising temperature process for three to four times, and then naturally cooling to 650 DEG C in the air; then continuously raising the temperature to 750-820 DEG C, and keeping the temperature for 1 minute through intermittent heating; and after naturally cooling to 570-590 DEG C, instantly electrifying and raising the temperature by 20-50 DEG C, and naturally cooling. The steel wire connecting method provided by the invention has the beneficial effects that through high temperature tempering processing at the weld part, the internal stress generated in welding is reduced, the tenacity of the welding part is improved, the phenomenon of end breakage at the welding position in the drawing process is prevented, and the end breakage rate is lowered.

Description

technical field [0001] The invention relates to a steel wire production process, in particular to a steel wire connection method. Background technique [0002] In the wire drawing production process, the welding of the head of the raw material wire rod is carried out in order to realize continuous production. The welded area generally undergoes nine high-speed drawing passes, and the total compression rate is usually around 80%. [0003] Due to the influence of high welding temperature during welding, carbides are easy to accumulate and grow in the grain boundary of high carbon steel wire rod, and the grain grows fast, which reduces the strength of the joint. At the same time, the thermal conductivity of high-carbon steel is worse than that of low-carbon steel, so rapid cooling in the molten pool and the affected area is likely to produce brittle structures, resulting in a decrease in the toughness of the weld. Due to the reduction of the strength and toughness of the weld...

AI Technical Summary

Problems solved by technology

[0003] Due to the influence of welding high temperature during welding of high carbon steel wire rod, carbides are easy to accumulate and grow at the grain boundary, and the grain grows fast, which reduces the strength of the joint

At the same time, the thermal conductivity of high-carbon steel is worse than that of low-carbon steel, so rapid cooling in the molten pool and the affected area is likely to produce brittle structures, resulting in a decrease in the toughness of the weld

Due to the reduction of the strength and toughness of the welding point, and the large amount of deformation during the drawing process of the steel wire, it is easy to break the wire during the multi-pass high-speed drawing process at the welding point, which not only affects the production efficiency, but also affects the personal life of the operator. Security also poses a certain threat

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