Presoaking silver brazing method between diamond laminate sheet and carbon steel

A diamond composite sheet, silver brazing technology, applied in welding equipment, metal processing equipment, heat treatment process control and other directions, can solve problems such as large performance differences, composite sheet stripping, etc., to improve shear resistance and improve welding strength. , The effect of uniform welding layer

Inactive Publication Date: 2007-10-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the base of the diamond compact sheet is mostly cemented carbide with a WC content of up to 90%, the performance difference between it and carbon steel or alloy steel is very large, so the current brazing process and welding method are easy to cause the composite sheet on the drill The phenomenon of "flaking off"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The pre-soaked silver brazing method between the diamond compact and carbon steel comprises the following steps:

[0017] 1) Clean and pre-treat the welding surfaces of diamond composite sheets and carbon steel.

[0018] 2), the selected silver brazing material and brazing flux are first added to the hard alloy surface of the diamond composite sheet base for heat treatment, so that the silver solder is infiltrated and diffused on the hard alloy surface of the diamond composite sheet base. The heat treatment temperature described above is 650°C, and the time is 5 seconds; the effect of the brazing flux is to remove the oxide layer and oil stains on the welding surface, to help the silver brazing material to melt, to increase the fluidity of the solder, and to improve the smoothness of the welding surface. In actual operation, there is no quantitative weight ratio relationship between the silver brazing material and the brazing flux. The thickness of the infiltration lay...

Embodiment 2

[0024] The pre-soaked silver brazing method between the diamond compact and carbon steel comprises the following steps:

[0025] 1) Clean and pre-treat the welding surfaces of diamond composite sheets and carbon steel.

[0026] 2), the selected silver brazing material and brazing flux are first added to the hard alloy surface of the diamond composite sheet base for heat treatment, so that the silver solder is infiltrated and diffused on the hard alloy surface of the diamond composite sheet base. The temperature of the heat treatment described above is 680° C., and the time is 8 seconds; the thickness of the silver solder infiltrating the hard alloy surface of the diamond compact substrate is 0.10-0.15 mm.

[0027] 3) Add silver brazing material to the carbon steel welding surface for heat treatment to make it infiltrate and diffuse on the surface. The temperature of the heat treatment is 680° C. and the time is 8 seconds. The thickness of the wetting layer of silver solder on...

Embodiment 3

[0032] The pre-soaked silver brazing method between the diamond compact and carbon steel comprises the following steps:

[0033] 1) Clean and pre-treat the welding surfaces of diamond composite sheets and carbon steel.

[0034] 2), the selected silver brazing material and brazing flux are first added to the hard alloy surface of the diamond composite sheet base for heat treatment, so that the silver solder is infiltrated and diffused on the hard alloy surface of the diamond composite sheet base. The temperature of the heat treatment described above is 700° C. and the time is 10 seconds. The thickness of the infiltration layer of silver solder on the surface of the cemented carbide substrate of the diamond composite sheet is 0.10-0.15mm.

[0035] 3) Add silver brazing material to the carbon steel welding surface for heat treatment to make it infiltrate and diffuse on the surface. The temperature of the heat treatment is 700° C. and the time is 10 seconds. The thickness of the...

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Abstract

A method for welding the composite diamond plate with carbon steel by use of pre-impregnation and Ag solder includes such steps as cleaning their surfaces to be welded, adding the chosen Ag solder and flux to the surface of hard alloy used as the substrate of composite diamond plate, heat treating at 650-700 deg.C for 5-10 s for impregnation and diffusion, adding the Ag solder to the surface of carbon steel, heat treating at 650-700 deg.C for 5-10 s, adding Ag solder and flux to the position between said composite diamond plate and carbon steel, and welding by oxyacetylene flame of HF induction.

Description

technical field [0001] The invention relates to a welding method between a diamond composite sheet and carbon steel. Background technique [0002] The upper part of PDC (Polycrystalline Diamond Compact) is a thin layer of polycrystalline diamond, and the lower part is a tungsten carbide substrate. Diamond compact (PDC) tools are widely used in geological exploration, oil drilling, machining and other industries. At present, most of the welding between the diamond compact and the steel matrix (drill body) adopts oxygen-acetylene brazing or high-frequency induction brazing, that is, the solder and flux are directly placed between the cemented carbide substrate and the carbon steel welding surface. Then use flame or high-frequency induction heating to melt the solder for welding. Since the base of the diamond compact sheet is mostly cemented carbide with a WC content of up to 90%, the performance difference between it and carbon steel or alloy steel is very large, so the curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K1/19B23K1/00B23K1/002C21D11/00
Inventor 刘晓阳段隆臣
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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