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Special welding rod for repairing and overlaying heavy-duty high-speed broken gear teeth

A gear and tooth breaking technology, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of restricting wide application, reducing the quality of gear after welding, repair failure, and easy cracks on the surface of the gear, etc., to achieve reduction Manufacturing process, saving of raw materials and energy, effects of easy welding

Inactive Publication Date: 2012-05-09
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, many enterprises at home and abroad have attempted to repair heavy-duty, high-speed forged steel gears with broken teeth by surfacing welding. However, due to heavy-duty, high-speed forged steel Steel manufacturing, after carburizing or carbonitriding, its carbon equivalent is quite high, even under the conditions of pre-welding preheating and post-welding heat treatment, cracks are prone to appear on the gear surface, reducing the quality of the gear after welding or even repair failure, Thus limiting the wide application of overlay welding repair technology for heavy-duty, high-speed forged steel gear broken teeth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw materials for the drug skin are 35 kg of marble, 20 kg of fluorite, 5 kg of quartz, 4 kg of clay, 6 kg of high-carbon ferrochrome, 1 kg of high-carbon ferromanganese, 5 kg of graphite, 1 kg of ferrosilicon, and 1 kg of ferrotitanium. kg, 5 kg of ferromolybdenum, 3 kg of lanthanum trioxide, 7 kg of nickel metal, 4 kg of medium carbon ferrochrome, 3 kg of ferro-vanadium and H08A steel welding wire. First passivate ferrosilicon, medium-carbon ferrochrome and high-carbon ferromanganese, that is, heat the ferrosilicon powder and keep it at 720°C for 1 hour; heat the medium-carbon ferrochrome powder and keep it at 550°C for 1 hour; Ferromanganese powder is heated and kept at 300°C for 1 hour. Put the various raw materials of the above-mentioned drug skin into the mixer to fully mix, then add water glass binder and stir evenly, the modulus of the water glass is 2.7, and the Baume degree is 48. Extrude the above-mentioned mixed material on the H08A steel welding wire w...

Embodiment 2

[0026] The raw materials for the drug skin are 30 kg of marble, 17 kg of fluorite, 4 kg of quartz, 3 kg of clay, 7 kg of high-carbon ferrochrome, 2 kg of high-carbon ferromanganese, 6 kg of graphite, 2 kg of ferrosilicon, and 2 kg of ferrotitanium. kg, 6 kg of ferromolybdenum, 4 kg of lanthanum trioxide, 8 kg of nickel metal, 5 kg of medium carbon ferrochrome, 4 kg of ferro-vanadium and H08A steel welding wire. First passivate ferrosilicon, medium-carbon ferrochrome and high-carbon ferromanganese, that is, heat the ferrosilicon powder and keep it at 730°C for 1 hour; heat the medium-carbon ferrochrome powder and keep it at 570°C for 1 hour; Ferromanganese powder is heated and kept at 350°C for 1 hour. Put the various raw materials of the above-mentioned drug skin into the mixer to fully mix, then add the water glass binder and stir evenly, the modulus of the water glass is 2.8, and the Baume degree is 49. Extrude the above-mentioned mixed material on the H08A steel welding wi...

Embodiment 3

[0028] The raw materials for the drug skin are 25 kg of marble, 14 kg of fluorite, 3 kg of quartz, 2 kg of clay, 8 kg of high-carbon ferrochrome, 3 kg of high-carbon ferromanganese, 7 kg of graphite, 3 kg of ferrosilicon, and 3 kg of ferrotitanium. kg, 7 kg of ferromolybdenum, 5 kg of lanthanum trioxide, 9 kg of nickel metal, 6 kg of medium carbon ferrochrome, 5 kg of ferro-vanadium and H08A steel welding wire. First passivate ferrosilicon, medium-carbon ferrochrome and high-carbon ferromanganese, that is, heat the ferrosilicon powder and keep it at 750°C for 1 hour; heat the medium-carbon ferrochrome powder and keep it at 600°C for 1 hour; Ferromanganese powder is heated and kept at 350°C for 1 hour. Put the various raw materials of the above-mentioned drug skin into a mixer to fully mix, then add water glass binder and stir evenly, the modulus of the water glass is 3.0, and the Baume degree is 50. Extrude the above-mentioned mixed material on the H08A steel welding wire wit...

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Abstract

Disclosed is a special welding rod for repairing and overlaying heavy-duty high-speed broken gear teeth. According to weight percentage wt%, chemical components of the coating of the special welding rod include 25-35% of marble, 14-20% of fluorite, 3-5% of quartz, 2-4% of chalk, 6-8% of high-carbon ferrochrome, 1-3% of high-carbon ferromanganese, 5-7% of graphite, 1-3% of ferrosilicon, 1-3% of ferrotitanium, 5-7% of ferromolybdenum, 3-5% of lanthanum trioxide, 7-9% of metallic nickel, 4-6% of medium-carbon chromium iron and 3-5% of ferrovanadium, and a core wire is made of H08A steel. A gear with broken teeth needing repair is preheated at the temperature of 300-400 DEG C before welding, and is tempered at the temperature of 100-200 DEG C after welding. The special welding rod is convenient in field use and easy in welding, cracking is avoided after welding, welding quality is obviously improved, the surface hardness of the welded gear ranges from HRC (Rockwell hardness) 58 to HRC 63, and the service life of the repaired gear is 3-4 times of that of the original gear.

Description

technical field [0001] The invention relates to a welding rod, in particular to a special welding rod for overlay welding. Background technique [0002] Gear is one of the most widely used parts in mechanical transmission. It not only plays an important role in products such as automobiles, tractors, machine tools, and hoisting machinery, but also uses a large amount. According to the type of material, gears mainly include forged steel, cast steel, cast iron and non-ferrous metals. Among them, forged steel is the most widely used, and gears for important purposes are usually made of forged steel. The selection of specific gear materials is mainly determined according to the size of the load, the speed of the gear and the precision requirements of the gear when the gear is working. According to the load of the gear, it is generally divided into light load, medium load and high load; according to the gear speed, it is generally divided into low-speed gear (1~9 m / s), medium-s...

Claims

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Application Information

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IPC IPC(8): B23K35/365B23K35/40
Inventor 杨庆祥杨育林周野飞齐效文
Owner YANSHAN UNIV
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