A hard alloy stud for arc welding and a method for manufacturing a wear-resistant part thereof

By using low-carbon steel conical connecting members as arc welding melting electrodes, welding cemented carbide column nails and filling metal liquids with surfacing technology, the low connection strength between cemented carbide column nails and wear-resistant parts in the prior art is solved. Problem, high-density layout and high wear resistance and wear-resistant parts are manufactured and repaired.

CN114576250BActive Publication Date: 2024-12-20LANZHOU MONISEK SPACE TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202011382608.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-12-01
Publication Date
2024-12-20
Estimated Expiration
2040-12-01

AI Technical Summary

Technical Problem

The prior art cannot effectively use arc welding method to connect cemented carbide column nails with wear-resistant parts, resulting in low connection strength and high density layout and wear resistance. It is difficult to completely wet the cemented carbide column nails in the casting process. tiny gaps.

Method used

The low-carbon steel conical connecting member is used as the arc welding melting electrode. The cemented carbide column nails are welded on the wear-resistant parts through arc welding, and the metal liquid is filled with the welding process to enhance the connection strength and form a complete wear-resistant working face. .

Benefits of technology

It realizes efficient welding of cemented carbide column nails and wear-resistant parts, improves connection strength and wear resistance, can manufacture high-density layout of wear-resistant parts, and supports local repair.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN114576250B_ABST
    Figure CN114576250B_ABST
Patent Text Reader

Abstract

The present invention discloses a hard alloy column nail for arc welding and a method for manufacturing a wear-resistant part thereof. Its notable feature is that one end of the hard alloy column nail has a conical low-carbon steel conical connector with a certain thickness and a conical angle of 120 to 150 degrees sintered as one body with the hard alloy column, and the center of the low-carbon steel conical connector has a conical tip with a diameter of 1mm to 2mm and a conical angle of 60 to 90 degrees, which is conducive to arc starting; the manufacturing method of the hard alloy column nail for arc welding is as follows: the low-carbon steel conical connector is placed into a powder pressing mold with the conical tip facing downward, and the hard alloy powder premix is ​​filled and pressed into a mold for arc welding. Carbide stud blank; sintering boats are flattened with a certain thickness of magnesia sand, and carbide studs for arc welding are placed vertically on the magnesia sand with the cone tip facing downward, and then placed in a vacuum sintering furnace or a protective atmosphere sintering furnace for sintering and forming. After sintering and forming, copper plating is performed to improve the conductivity of the surface of the carbide studs, which is conducive to welding; a DC welding machine with a large current is used to weld the carbide studs on the wear-resistant part substrate in a regular arrangement by contact arcing and then pressing into the molten pool, and then the gaps between the carbide studs are filled with a surfacing process to connect the substrate and the carbide studs as a whole. The method for manufacturing wear-resistant parts can be used for remanufacturing and repairing wear-resistant parts.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The invention relates to a hard alloy stud for arc welding and a method for welding the hard alloy stud to a working surface of a wear-resistant part by arc welding to manufacture the wear-resistant part; the invention belongs to the technical field of wear-resistant part manufacturing. Background Art

[0002] The carbide studs used to manufacture wear-resistant parts cannot be connected to the wear-resistant parts by arc welding due to the high content of ceramic hard phase. Only brazing and inlay casting can be used. The brazing method is only suitable for some wear-resistant parts with simple structure and small size, such as pick teeth, shield machine scrapers, etc., and the brazing connection strength is relatively low; the inlay casting process is to fix a certain number of carbide studs on the casting mold of the wear-resistant part where wear-resistant reinforcement is required, and the cast metal liquid infiltrates the carbide studs. After the metal liquid solidifies, the carbide studs are fixed in the wear-resistant part matrix by metallurgical bonding or mechanical embedding; the carbide stud inlay casting method has high production efficiency for manufacturing wear-resistant parts, but it is impossible to manufacture wear-resistant parts with high density arrangement of carbide studs and higher wear resistance, and it is not easy to achieve metallurgical bonding between the carbide studs and the wear-resistant part matrix. The reason is that the metal liquid cannot flow into the smaller gaps between the carbide studs and completely infiltrate the carbide studs, and it is impossible to form an effective inlay casting connection to ensure the bonding strength.

[0003] The present invention discloses a carbide column nail for arc welding and a method for manufacturing a wear-resistant part thereof. The carbide column nail for arc welding has the following features: one end of the carbide column nail has a low-carbon steel conical connecting component with a certain thickness and a conical angle of 120 to 150 degrees, which can be welded to the wear-resistant part substrate by arc welding and sintered integrally with the carbide column as a melting pole for arc welding. The center of the low-carbon steel conical connecting component has a conical tip with a root diameter of 1mm to 2mm and a conical angle of 60 to 90 degrees, which is conducive to arc starting of arc welding, and the other end is a carbide column; the method for manufacturing the carbide column nail for arc welding is as follows: the low-carbon steel conical connecting component is placed into a powder pressing and molding mold with the conical tip facing downward, a certain amount of carbide powder premix is ​​filled to press and mold a carbide column nail blank for arc welding, and the arc welding is placed in the mold. The conical tip of a cemented carbide stud blank is placed vertically downward on the magnesia sand spread on the sintering boat, and is placed in a vacuum sintering furnace for sintering. After sintering, the cemented carbide stud is copper-plated to improve the conductivity of the surface of the cemented carbide stud. The method for manufacturing wear-resistant parts with arc welding cemented carbide studs is as follows: a low-carbon steel conical connecting component of the arc welding cemented carbide stud is used as a melting electrode, and is welded to the substrate of the wear-resistant working surface of the wear-resistant part by an arc welding method according to the regular arrangement position and arrangement density required by the wear-resistant part, and then a surfacing process is used to fill the gaps between the cemented carbide studs with surfacing metal liquid, and the metal liquid fuses and connects the cemented carbide studs and the wear-resistant part substrate to form a complete wear-resistant working surface; multi-layer welding can be performed according to the thickness of the wear-resistant layer of the wear-resistant part, and close-packed welding of the cemented carbide studs can be achieved. Summary of the invention

[0004] The present invention discloses a hard alloy stud for arc welding and a method for manufacturing a wear-resistant part thereof. The invention contents are as follows:

[0005] The carbide stud for arc welding has the remarkable feature that one end of the carbide stud has a low-carbon steel conical connecting component with a certain thickness and a conical angle of 120 to 150 degrees, which can be welded to the wear-resistant part substrate by arc welding and sintered integrally with the carbide column and serves as an arc welding melting electrode. The center of the low-carbon steel conical connecting component has a conical tip with a diameter of 1 mm to 2 mm and a conical angle of 60 to 90 degrees. The other end of the carbide stud is a carbide column sintered integrally with the low-carbon steel conical connecting component to form a metallurgical bond. After sintering, the surface is copper-plated to facilitate arc welding.

[0006] The manufacturing method of cemented carbide studs for arc welding is as follows: a conical connecting component made of low carbon steel is placed with the conical tip facing downward into a powder pressing mold, a certain amount of cemented carbide powder premix is ​​filled and pressed into a cemented carbide stud blank for arc welding, the cemented carbide stud blank for arc welding is placed vertically with the conical tip facing downward on magnesia sand spread on a sintering boat, and is placed in a vacuum sintering furnace for sintering. After the surface is copper-plated, it becomes a cemented carbide stud for arc welding.

[0007] The invention discloses a method for manufacturing wear-resistant parts by using hard alloy studs for arc welding: using a direct current welding power source and a low-carbon steel conical connecting component as a melting electrode, welding the hard alloy studs for arc welding on the working surface of the wear-resistant part according to the arrangement position and arrangement density required by the wear-resistant part, and the welding process is that the conical tip of the low-carbon steel conical connecting component contacts the working surface of the wear-resistant part to draw an arc and start an arc, melts the wear-resistant part matrix and the conical part of the low-carbon steel conical connecting component, presses into the molten pool for solidification, and completes the welding of a hard alloy stud; after the welding of the hard alloy studs on the working surface is completed, the cladding process is used to fill the metal liquid into the gap between the hard alloy studs, and the wear-resistant part matrix and the hard alloy studs are fused and connected to form a complete wear-resistant working surface; multi-layer welding and cladding can be performed according to the thickness requirements of the wear-resistant part; the wear-resistant part manufacturing method can be used for both wear-resistant part manufacturing and local repair and remanufacturing of wear-resistant parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of a cemented carbide stud for arc welding;

[0009] In the figure: 1. Cemented carbide cylinder 2. Conical connecting member made of low carbon steel. DETAILED DESCRIPTION

[0010] The carbide stud for arc welding has the remarkable feature that one end of the carbide stud has a low-carbon steel conical connecting component with a certain thickness and a conical angle of 120 to 150 degrees, which can be welded to the wear-resistant part substrate by arc welding and sintered integrally with the carbide column and serves as an arc welding melting electrode. The center of the low-carbon steel conical connecting component has a conical tip with a diameter of 1 mm to 2 mm and a conical angle of 60 to 90 degrees. The other end of the carbide stud is a carbide column sintered integrally with the low-carbon steel conical connecting component to form a metallurgical bond. After sintering, the surface is copper-plated to facilitate arc welding.

[0011] The manufacturing method of cemented carbide studs for arc welding is as follows: a conical connecting component made of low carbon steel is placed with the conical tip facing downward into a powder pressing mold, a certain amount of cemented carbide powder premix is ​​filled and pressed into a cemented carbide stud blank for arc welding, the cemented carbide stud blank for arc welding is placed vertically with the conical tip facing downward on magnesia sand spread on a sintering boat, and is placed in a vacuum sintering furnace for sintering. After the surface is copper-plated, it becomes a cemented carbide stud for arc welding.

[0012] The invention discloses a method for manufacturing wear-resistant parts by using hard alloy studs for arc welding: using a direct current welding power source and a low-carbon steel conical connecting component as a melting electrode, welding the hard alloy studs for arc welding on the working surface of the wear-resistant part according to the arrangement position and arrangement density required by the wear-resistant part, and the welding process is that the conical tip of the low-carbon steel conical connecting component contacts the working surface of the wear-resistant part to draw an arc and start an arc, melts the wear-resistant part matrix and the conical part of the low-carbon steel conical connecting component, presses into the molten pool for solidification, and completes the welding of a hard alloy stud; after the welding of the hard alloy studs on the working surface is completed, the cladding process is used to fill the metal liquid into the gap between the hard alloy studs, and the wear-resistant part matrix and the hard alloy studs are fused and connected to form a complete wear-resistant working surface; multi-layer welding and cladding can be performed according to the thickness requirements of the wear-resistant part; the wear-resistant part manufacturing method can be used for both wear-resistant part manufacturing and local repair and remanufacturing of wear-resistant parts.

Claims

1. A method for making wear-resistant parts by arc welding of carbide studs, Features: One end of the cemented carbide stud has a low-carbon steel conical connecting member as an arc welding melting pole, which can be arc welded to the wear-resistant part substrate and is integrally sintered and metallurgically bonded with the cemented carbide column, and the other end is a cemented carbide column, and the two ends are integrally sintered and metallurgically bonded to form a cemented carbide stud for arc welding, the connecting member has a certain thickness and a conical angle of 120 to 150 degrees, and the center of the connecting member has a conical tip with a root diameter of 1 mm to 2 mm and a conical angle of 60 to 90 degrees; Use a DC welding power source and a low-carbon steel conical connecting component as the melting electrode, and weld the carbide studs for arc welding on the working surface of the wear-resistant part according to the arrangement position and arrangement density required by the wear-resistant part. The welding process is that the conical tip of the low-carbon steel conical connecting component contacts the working surface of the wear-resistant part to draw the arc and start the arc, melt the wear-resistant part matrix and the conical part of the low-carbon steel conical connecting component, press them into the molten pool for solidification, and then complete the welding of a carbide stud. After the welding of the carbide studs on the working surface is completed, the surfacing process is used to fill the metal liquid into the gap between the carbide studs, and the wear-resistant part matrix and the carbide studs are fused and connected to form a complete wear-resistant working surface.

2. The method for making wear-resistant parts by arc welding of carbide studs according to claim 1, Features: The connecting member and the hard alloy cylinder are integrally formed by pressing.

3. The method for manufacturing wear-resistant parts by arc welding of carbide studs according to claim 1, Features: The connecting member and the cemented carbide column are sintered integrally.

4. The method for manufacturing wear-resistant parts by arc welding of carbide studs according to claim 1, Features: The thickness of the conical edge of the connecting member is 1 mm to 3 mm.

5. The method for manufacturing wear-resistant parts by arc welding of carbide studs according to claim 1, Features: The carbon content of the connecting member is less than 0.1%.

6. The method for manufacturing wear-resistant parts by arc welding of carbide studs according to claim 1, Features: The sintering method of the hard alloy column nail for arc welding is that the conical tip of the hard alloy column nail for arc welding is placed vertically and sintered downward.