Method for strengthening steel wire connector
A steel wire and two-end technology, applied in the field of steel wire production technology, can solve the problems of affecting production efficiency, decreased toughness of welding, poor thermal conductivity, etc., and achieves the effect of standardizing welding operations, preventing end breakage, and improving production efficiency.
Inactive Publication Date: 2017-06-09
周子童
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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
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0018] The wire rod is φ12.5mm82B wire rod.
[0019] (1) Straightening: Straighten the heads of the two wire rods respectively, remove the burrs at the cut ends with a grinding wheel, and perform 45° chamfering treatment with a length of 2mm.
[0020] (2) Grinding head: Grinding the end of the wire rod, after grinding the head, use sandpaper to clean the impurities around the end of the wire rod.
[0021] (3) Butt welding: Clamp the wire rod processed in step (2) to the welding position of the welding machine, and use resistance butt welding for welding. The wire rod at both ends should be kept horizontal. If the clamping mechanism is found to be loose, it should be adjusted in time . The welding temperature of the steel wire is 1080-1270°C, the upsetting time is 3-8s, the width of the weld is 1-3mm, the height of the weld is 2-3mm, and there are uniform cracks around it. Cool naturally to 30-40°C at ambient temperature. After the welding is completed, grind the weld. The g...
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The invention discloses a method for strengthening a steel wire connector and provides the method for strengthening the steel wire connector. According to the method for strengthening the steel wire connector, the head breaking phenomenon can be prevented from happening to the welding position in the drawing process, and the head breaking rate is reduced. A polished welding joint position is clamped at a tempering tong opening, temperature rising is conducted 6-8 times intermittently, two times of temperature rising are spaced by 3 s to 4 s, and temperature rising is stopped when the temperature reaches 830 DEG C to 850 DEG C; when the temperature is naturally cooled to be 650 DEG C in air, the temperature is continuously increased to 830 DEG C to 850 DEG C, temperature rising is stopped, the above cooling-temperature rising process is repeated three to four times, and afterwards, natural cooling is conducted to 650 DEG C in air; then the temperature is continuously increased to 830 DEG C to 850 DEG C, heat preservation is conducted for 1 min through intermittent heating; and after natural cooling is conducted to 570 DEG C to 590 DEG C, electrifying is conducted instantly again and the temperature is increased by 10 DEG C to 20 DEG C, and natural cooling is conducted. The method is used for conducting high-temperature tempering treatment at the welding position, internal stress generated during welding is reduced, toughness at the position of a welding head is improved, the head breaking phenomenon happening to the welding position in the drawing process is avoided, and the head 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 typically undergoes nine passes of high-speed drawing, with a total compression rate usually around 80%. [0003] Due to the influence of welding high temperature during welding of high carbon steel wire rod, carbides are easy to accumulate and grow in the grain boundary, and the grain grows fast, which reduces the joint strength. 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 t...
Claims
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 周子童
Owner 周子童