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Welding method for welding polycrystalline diamond compacts (PDC) and tungsten carbide matrix by using silver solder

A diamond composite sheet and tungsten carbide carcass technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of PDC sheet failure, poor welding, and PDC sheet falling off, so as to achieve uniform welding layer and improve welding quality. Quality, improve the effect of shear strength

Active Publication Date: 2015-04-08
CCDC PETROLEUM CORING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the diamond composite sheet is artificial polycrystalline diamond, its failure temperature is 700°C, and the base material of the diamond composite sheet is cemented carbide, which has a great difference in performance from the tungsten carbide matrix. The current oxygen-acetylene brazing, Overlay welding process and method, poor surface treatment or preheating and heat preservation effect in the early stage will easily lead to weak welding, and the phenomenon of "flaking off" of the diamond composite sheet will occur during normal use
At the same time, the control of soldering temperature also has a great influence on the soldering quality. If the soldering temperature is too high, it will easily cause the failure of the PDC chip; fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] As a preferred embodiment of the present invention, the present invention discloses a welding method for welding a diamond composite sheet and a tungsten carbide matrix using silver brazing material, comprising the following steps:

[0029] Step 1: When making a PDC drill bit, first form a hole on the tungsten carbide matrix with an inner diameter larger than the outer diameter of the diamond compact by 0.32mm-0.40mm;

[0030] The second step: before welding, clean the welding surface of the diamond composite sheet and the tungsten carbide matrix with absolute ethanol with a volume concentration of 99.7%;

[0031] Step 3: Apply silver brazing flux on the welding surface of the tungsten carbide matrix, heat the tungsten carbide matrix to 640-680°C, and keep it warm for 1 hour; place the diamond composite sheet in the crucible and add silver brazing flux, heat To 640-680 ℃, keep warm for 30 minutes;

[0032] Step 4: Keep the temperature of the PDC drill bit at 640-680°C ...

Embodiment 2

[0034] As another preferred embodiment of the present invention, after the fourth step, there is a fifth step: after the welding is completed, put it into the heat preservation barrel for slow cooling. In the third step, the heating temperatures of the tungsten carbide matrix and the inside of the crucible are both 650-670°C. All the other are with embodiment 1.

Embodiment 3

[0036] As the best implementation mode of the present invention, its steps are as follows:

[0037] Step 1: When making a PDC drill bit, form a hole in the tungsten carbide matrix with an inner diameter that is 0.32mm-0.40mm larger than the outer diameter of the diamond compact;

[0038] The second step: before welding, clean the welding surface of the diamond composite sheet and the tungsten carbide matrix with 99.7% absolute ethanol;

[0039] Step 3: Apply silver brazing flux on the welding surface of tungsten carbide carcass for heat treatment, effectively dissolve the oxides on the metal surface, promote the flow of silver brazing material, heat the tungsten carbide carcass to 640-680°C, and keep warm for 1 Hours; place the diamond compact in the crucible and add silver brazing flux, heat to 640-680°C, and keep warm for 30 minutes to effectively dissolve the oxides on the surface of the cemented carbide on the base of the diamond compact;

[0040] Step 4: Keep the drill b...

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Abstract

The invention discloses a welding method for welding a polycrystalline diamond compact (PDC) and a tungsten carbide matrix by using a silver solder. The welding method comprises the following steps of: a. forming a hole with an internal diameter size larger than an external diameter size of the PDC on the tungsten carbide matrix; b. before welding, cleaning the PDC and the welding surface of the tungsten carbide matrix by using anhydrous ethanol with the volume concentration of 99.7%; c. smearing a silver brazing flux on the welding surface of the tungsten carbide matrix, heating the tungsten carbide matrix to 640-680 DEG C; putting the PDC in a crucible and adding the silver brazing flux, and heating to 640-680 DEG C; and d. adding the silver solder and the silver brazing flux between the welding surface of the tungsten carbide matrix and a substrate of the treated PDC, and heating the silver solder by oxygen-acetylene flame. The method has the advantages that the process is simple, the welding quality is improved, the compact shedding phenomenon caused by instable welding is avoided, the life of a PDC bit is prolonged, and the overall performance is improved.

Description

technical field [0001] The invention is used for the welding of polycrystalline diamond compact drill bits, and relates to a silver brazing welding process between polycrystalline diamond compact (referred to as PDC sheet) and tungsten carbide matrix, which belongs to the manufacturing process of PDC drill bits technology field. Background technique [0002] PDC (polycrystalline diamond composite) drill bits are commonly used in geological exploration and oil drilling industries to break formation rocks. At present, most of the welding between the diamond compact and the tungsten carbide matrix adopts oxygen-acetylene brazing or high-frequency induction brazing, and the solder and flux are directly placed between the cemented carbide and the tungsten carbide matrix welding surface, and then Use flame or high-frequency induction heating to melt the solder for welding. [0003] At the same time, the date of publication was October 31, 2003, and the publication title was "Jou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/19B23K1/20
Inventor 付晓平冯明高含李勇姚建林
Owner CCDC PETROLEUM CORING TECH
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