Special welding electrode for surfacing and repairing broken teeth of medium-load and medium-speed gear

A technology for gears and broken teeth, which is applied in the field of surfacing welding, can solve the problems of high carbon equivalent, reduce the quality of gears after welding, repair failure, and cracks on the surface of gears, etc., so as to improve welding quality, save raw materials and energy, and reduce manufacturing processes. Effect

Inactive Publication Date: 2012-06-13
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, many enterprises at home and abroad have tried to repair medium-load and medium-speed forged steel gears with broken teeth by surfacing welding, but because medium-load and medium-speed forged steel gears are made of medium carbon steel or alloy quenched and tempered steel Made of low-hardenability steel with high carbon equivalent, even under the conditions of pre-weld preheating and post-weld heat treatment, cracks will appear on the gear surface, which will reduce the quality of the gear after welding and even fail to repair, thus limiting the Wide application of surfacing welding repair technology for rapid forging 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, 4 kg of high-carbon ferrochrome, 2 kg of high-carbon ferromanganese, 3 kg of graphite, 2 kg of ferrosilicon, and 2 kg of ferrotitanium. kg, 3 kg of ferromolybdenum, 4 kg of lanthanum trioxide, 7 kg of nickel metal, 6 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, 5 kg of high-carbon ferrochrome, 3 kg of high-carbon ferromanganese, 4 kg of graphite, 3 kg of ferrosilicon, and 3 kg of ferrotitanium. kg, 4 kg of ferromolybdenum, 5 kg of lanthanum trioxide, 8 kg of nickel metal, 7 kg of medium carbon ferrochrome, 4 kg of ferro-vanadium and H08A steel welding wire. First passivate ferrosilicon, medium carbon ferrochromium and high carbon ferromanganese, that is, heat the ferrosilicon powder and keep it at 740°C for 1 hour; heat the medium carbon ferrochrome powder and keep it at 580°C for 1 hour; Ferromanganese powder is heated and kept at 320°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 2.9, and the Baume degree is 49. Extrude the above-mentioned mixed material on the H08A steel welding ...

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, 6 kg of high-carbon ferrochrome, 4 kg of high-carbon ferromanganese, 5 kg of graphite, 4 kg of ferrosilicon, and 4 kg of ferrotitanium. kg, 5 kg of ferromolybdenum, 6 kg of lanthanum trioxide, 9 kg of nickel metal, 8 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 electrode for surfacing and repairing broken teeth of a medium-load and medium-speed gear. Chemical components of the coating of the special welding electrode in weight percent (wt %) include 25-35% of marble, 14-20% of fluorite, 3-5% of quartz, 2-4% of chalk, 4-6% of high carbon ferrochromium, 2-4% of high carbon ferromanganese, 3-5% of graphite, 2-4% of ferrosilicon, 2-4% of ferrotitanium, 3-5% of ferromolybdenum, 4-6% of lanthanum trioxide, 7-9% of metallic nickel, 6-8% of medium carbon ferrochromium and 3-5% of ferrovanadium, and a core wire is an H08A steel welding wire. When the special welding electrode is used, preheating at the temperature of 200-300 DEG C is performed before welding, and tempering at the temperature of 100-200 DEG C is performed after welding. The special welding electrode is convenient to use on site, easy in welding and non-cracking after welding. The surface hardness of the gear after welding ranges from HRC (Rockwell hardness) 50 to HRC 55, and the service life of the repaired gear is three to four times that of an original gear.

Description

technical field [0001] The invention relates to a surfacing welding technology, in particular to a surfacing welding technology for repairing broken teeth of medium-load and medium-speed forged steel gears. 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; accordin...

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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