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Special welding electrode for surfacing and repairing broken teeth of cast steel gear

A technology of cast steel gears and broken teeth, applied in the field of material science and engineering, can solve the problems of difficulty in manufacturing large-scale heat treatment furnaces, welding cracks, waste of energy, etc.

Inactive Publication Date: 2010-12-22
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, for larger cast steel gears, if ordinary surfacing welding electrodes are used, the gears must be preheated to about 450°C before welding, and heat treatment must be carried out after welding, otherwise the welding will crack
At the same time, it is also difficult to manufacture a large-scale heat treatment furnace. Even if such a large furnace can be manufactured, it will cause huge economic benefits to the enterprise due to the waste of a lot of energy.

Method used

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Examples

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Embodiment Construction

[0013] The following disclosure is an example of the present invention, requiring: marble 47.2, clay 4.5, fluorite 24.7, quartz 1.7, rutile 2.8, titanium iron 8.8, high carbon ferromanganese 3.3, silicon ferrosilicon 1.6, yttrium oxide 3.3, metal nickel 2.1. The welding core adopts H08A steel welding wire. The modulus of the binder water glass used is 2.7-3.0, and the concentration (Baume degree) is 48-50. For ferrosilicon and high-carbon ferromanganese powder, passivation treatment is required before use. The passivation process for ferrosilicon powder is 730°C, and for high-carbon ferromanganese powder is 320°C. The above metal powders are all kept warm for 1 hour. Mix the relevant powders in the above formula with a mixer, then add water glass and stir evenly, extrude the welding rod with a welding rod coating machine, dry the welding rod at 250-300°C, and then grind the head and tail.

[0014] Use the surfacing electrode manufactured above to repair the ZG270-500 large ca...

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Abstract

The invention relates to a welding electrode for surfacing and repairing broken teeth of a cast steel gear, belonging to the materials science and engineering field. The welding electrode comprises the following chemical components: 45-55wt% of marbles, 4-7wt% of chalk, 20-30wt% of fluorite, 1-3wt% of quartz, 2-4wt% of rutile, 6-10wt% of ferrotitanium, 3-5wt% of high carbon ferromanganese, 1-2wt% of ferrosilicon, 2-4wt% of yttrium oxide and 1-3wt% of metallic nickel. The core wire is H08A steel welding wire. An adopted water glass binder has modulus of 2.7-3.0 and concentration (Baume degree) of 48-50. The surfacing welding electrode can be used for surfacing and repairing the broken teeth of the cast steel gear without preheating before welding and heat treatment after welding. The surfacing metal has higher crack resistance, certain hardness (HB160-260) and abrasive resistance and simultaneously certain processability.

Description

technical field [0001] The invention relates to the field of material science and engineering, in particular to an electrode for overlay welding for repairing broken teeth of cast steel gears. Background technique [0002] Gear transmission has the characteristics of constant transmission ratio, high efficiency, and compact structure. Gears are widely used in mechanical transmission. For some large gear blanks with large diameter and complex shape, when it is difficult to form by forging, cast steel can be used, and its strength is about 10% lower than that of forged steel gears. Cast gears have lower precision and are often used in mining machinery and agricultural machinery. In the past ten years, with the development of casting technology, casting precision has been greatly improved, and some casting gears can be directly used in machinery with certain transmission precision requirements. In order to improve the precision of cast steel gears, machining processes should ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365B23K35/30
Inventor 杨庆祥刘文昌苑辉
Owner YANSHAN UNIV
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