Method for reinforcing steel wire joint

Abstract

The invention discloses a method for reinforcing a steel wire joint. According to the method for reinforcing the steel wire joint, the phenomenon that a welded position is broken in the drawing process can be prevented and the breaking rate is reduced. A polished weld joint is clamped by a tempering jaw, the temperature is increased 6 times to 8 times intermittently, the time interval of every two times of temperature increase ranges from 3 seconds to 4 seconds, and the temperature increase is stopped when the temperature reaches 830 DEG C to 850 DEG C; the weld joint is naturally cooled in the air till the temperature is 650 DEG C, the temperature is increased continuously to 830 DEG C to 850 DEG C, and then the temperature increase is stopped; after the cooling-temperature increase processes mentioned above are repeated three times to four times, the weld joint is naturally cooled in the air till the temperature is 650 DEG C; after the temperature is increased continuously to 830 DEG C to 850 DEG C, the weld joint is intermittently heated, and heat is preserved for 1 minute; and after the weld joint is naturally cooled to the temperature ranging from 570 DEG C to 590 DEG C, the temperature is increased by 10 DEG C to 20 DEG C through instant power supply again, and then the weld joint is naturally cooled. By the adoption of the method, the internal stress generated in the welding process is reduced, the tenacity of a welded end is improved, the phenomenon that the welded position is broken in the drawing process is prevented, and the breaking rate is reduced.

Description

technical field [0001] The invention relates to a production process of steel wire, in particular to a method for reinforcing steel wire joints. 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 toughn...

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