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A Vacuum Diffusion Welding Process of Cemented Carbide and Steel

A cemented carbide, vacuum diffusion technology, applied in metal material coating process, welding equipment, metal processing equipment, etc., can solve the problems of large thermal stress at the joint, increase cracks, difficulty in melting the base metal, etc., to improve the variety and distribution state, the effect of increasing strength

Active Publication Date: 2022-06-28
自贡中兴耐磨新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The melting point, thermal conductivity, linear expansion coefficient, and mechanical properties of cemented carbide and steel are very different. During welding, the base material with a low melting point melts first, and the base material with a high melting point is still heated, resulting in high and low melting points. It is difficult to melt the base metal, and a large thermal stress will be generated at the joint during the welding process, which increases the tendency of cracks. In addition, the cemented carbide is easy to oxidize at high temperature and forms an oxide film with a high melting point. These oxide films can not only form weld clamps The slag will directly affect the fusion of the weld, and will also cause welding microcracks in the weld

Method used

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  • A Vacuum Diffusion Welding Process of Cemented Carbide and Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A vacuum diffusion welding process of cemented carbide and steel.

[0023] Pre-welding treatment: roughly grind the spreading test surface and brazing surface of cemented carbide and steel on a diamond grinding machine, apply diamond abrasive paste on the cast iron block, and finally place the spreading surface and brazing surface on the cast iron Grinding until the surface is bright, 45 steel is roughly ground on a grinding machine, and then the spreading test surface and the brazing surface are polished with metallographic sandpaper. The brazing material CuMnNi is cut into sheets, and the size is slightly larger than the brazing surface. Make sure that the amount of brazing material is enough to fill the brazing gap, and polish the brazing material and iron sheet with metallographic sandpaper to remove the oxide layer;

[0024] When brazing, soak all the polished materials in acetone for 5-10 minutes, scrub them, and then take them out and dry them to prevent the samp...

Embodiment 2

[0033] Pre-welding treatment: roughly grind the spreading test surface and brazing surface of cemented carbide and steel on a diamond grinding machine, then apply diamond abrasive paste on the cast iron block, and finally place the spreading surface and brazing surface on the cast iron Grind until the surface is bright; roughly grind 45 steel on a grinding machine, and then use metallographic sandpaper to polish the spreading test surface and the brazing surface; the brazing filler metal sheets are all cut into sheets, and the size is slightly larger than the brazing surface , to ensure that the amount of solder is sufficient to fill the brazing gap, polish the solder and iron sheet with metallographic sandpaper, and remove the oxide layer;

[0034] When brazing, soak all the polished materials in acetone for 5-10 minutes, scrub them, and then take them out and dry them to prevent the samples from being polluted again. Vacuum diffusion brazing should be carried out as soon as p...

Embodiment 3

[0044] Pre-welding treatment: roughly grind the spreading test surface and brazing surface of cemented carbide and steel on a diamond grinding machine, then apply diamond abrasive paste on the cast iron block, and finally place the spreading surface and brazing surface on the cast iron Grind until the surface is bright; 45 steel is roughly ground on a grinding machine, and then the spreading test surface and the brazing surface are polished with metallographic sandpaper; the brazing filler metal CuMnTi is all cut into flakes, and the size is slightly larger than the brazing surface. To ensure that the amount of solder is sufficient to fill the brazing gap, polish the solder and iron sheet with metallographic sandpaper to remove the oxide layer;

[0045] When brazing, soak all the polished materials in acetone for 5-10 minutes, scrub them, and then take them out and dry them to prevent the samples from being polluted again. Vacuum diffusion brazing should be carried out as soon ...

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Abstract

A vacuum diffusion welding process of cemented carbide and steel, comprising: pre-welding treatment; Ni-plating the pretreated cemented carbide; recrystallization annealing of the solder; vacuum diffusion welding, adopting vacuum diffusion welding to hard The alloy and the dissimilar metal of steel are welded, and the diffusion welding is realized by strictly controlling the process parameters such as temperature, connection pressure and connection time.

Description

technical field [0001] The invention relates to the field of welding of dissimilar materials, in particular to a vacuum diffusion welding process of cemented carbide and steel. Background technique [0002] Cemented carbide has excellent properties such as high hardness and high wear resistance, so it is widely used in mechanical processing, geological exploration, mining and other industrial fields, but it is expensive, and steel has high strength, good toughness, and is easy to weld , but it is easy to wear. If steel and cemented carbide are combined, a certain process is used to make them form a good combination to form a cemented carbide-steel composite wear-resistant material WC welding stud. [0003] Since cemented carbide and steel belong to the connection of dissimilar materials, it is necessary to combine the two to form a composite welding stud through a specific process, and then use the method of arc stud welding to weld this WC welding stud with alloy steel, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20C23C18/36C23G1/14B23K103/18
CPCC23C18/36C23G1/14B23K1/008B23K1/20B23K1/206
Inventor 孙小傅孙锦民
Owner 自贡中兴耐磨新材料有限公司
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