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Welding method and silver based metal for hard-alloy heavy type cutting tools

A technology of hard alloy blades and hard alloys, which is applied in the direction of welding/cutting media/materials, welding media, welding equipment, etc., can solve the problems of reduced life, product quality, and influence on welding strength, so as to avoid welding cracks, Ensure welding quality and prevent surface oxidation

Inactive Publication Date: 2009-01-14
王朝
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] During the welding process, if the temperature is too high, it will cause oxidation of the cemented carbide blade, the steel substrate and the surface of the solder, which will affect the welding strength and even cause false welding.
However, if the temperature is too low, the solder fluidity is not good, which will cause pores or inclusions
All of these factors can result in reduced product quality, reduced lifespan, and possibly unusability at all
[0008] 3. The strength of the welding area cannot meet the requirements
This compound has a low melting point and has the properties of a glass body, so it has low strength in the welding zone of the carbide insert

Method used

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  • Welding method and silver based metal for hard-alloy heavy type cutting tools

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Steel substrate size: 152×45×21mm, carbide blade size: 152×21×11mm.

[0031] Silver-based solder consists of the following components by weight percentage: Ag 40%, Cu 30%, Zn 25%, Sn2%, Ni2%.

[0032] The welding temperature is 640°C, the heating rate is 1 degree / second, and the temperature is kept for 3 minutes. Then, the temperature was lowered to 300° C., the cooling rate was 3 degrees per second, and the temperature was kept for 60 minutes. Then, the power was turned off and the furnace was cooled to room temperature.

[0033] Test results: The welding area is completely filled without voids or cavities; the solder is evenly distributed, and no fast and strong impurities are observed; the silver-based solder, steel substrate, and carbide blade are all in a good bonded state, and no gaps are found .

Embodiment 2

[0035] Steel substrate size: 210×45×21mm, carbide blade size: 210×21×11mm.

[0036] Silver-based solder consists of the following components by weight percentage: Ag45%, Cu25%, Zn25%, Sn 2%, Ni2%.

[0037]The welding temperature is 620° C., the heating rate is 3 degrees per second, and the temperature is kept for 2 minutes. Then, lower the temperature to 290° C. at a cooling rate of 6 degrees per second, keep the temperature for 80 minutes, turn off the power and cool to room temperature with the furnace.

[0038] Test results: The welding area is completely filled without voids or cavities; the solder is evenly distributed, and no fast and strong impurities are observed; the silver-based solder, steel substrate, and carbide blade are all in a good bonded state, and no gaps are found .

Embodiment 3

[0040] Steel substrate size: 210×45×21mm, carbide blade size: 210×21×11mm.

[0041] Silver-based solder consists of the following components by weight percentage: Ag 50%, Cu 20%, Zn 25%, Sn 2%, Ni 2%.

[0042] The welding temperature is 600° C., the heating rate is 5 degrees per second, and the temperature is kept for 3 minutes. Then, the temperature was lowered to 280° C., the cooling rate was 8 degrees per second, and the temperature was kept for 100 minutes. Then, the power was turned off and the furnace was cooled to room temperature.

[0043] Test results: The welding area is completely filled without voids or cavities; the solder is evenly distributed, and no fast and strong impurities are observed; the silver-based solder, steel substrate, and carbide blade are all in a good bonded state, and no gaps are found .

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Abstract

The invention discloses a welding method of heavy type hard-alloy cutting tool and silver based solder thereof. The welding method and the silver based solder can effectively avoid the welding crack during welding process, and consequently assure the welding quality of the heavy cutting tool. The welding method comprises the following procedures: surface treatment of the welding area, removal of oil, purities and rust-spotting, and enabling the welding surface to have the certain roughness; coating the welding flux and the silver based solder on the welding surface of hard-holly blade and steel substrate, putting the welding material into a vacuum heating furnace, and counterweighing the welding material with a metal block; filling inert gas into the vacuum heating furnace and heating up to 600 to 640 DEG C and insulating; decreasing to 280 to 300 DEG C and insulating, and finally decreasing to the room temperature for completing the welding process. The composition of the silver based solder in weight percentage is as follows: 40 to 50 percent of Argentum, 20 to 30 percent of Copper, 18 to 25 percent of Zinc, 1 to 3 percent of Stannum, 1 to 3 percent of Nickel and impurities.

Description

technical field [0001] The invention relates to a heavy-duty cutting tool, in particular to a welding method for a hard alloy blade of the heavy-duty cutting tool and a steel substrate, and silver-based solder used for welding. Background technique [0002] Heavy duty cutting tools are used for the machining of large workpieces such as marine engine crankshafts and large rolls. Heavy-duty cutting tools usually adopt the production method of welding carbide inserts on the steel substrate. This method can not only solve the problem that the overall alloy is difficult to process, but also save a lot of expensive alloy materials. [0003] Cemented carbide is a special tool material with metallic properties that is made of insoluble metal materials (WC, TiC, TaC, NeC) and transition metals (Co, Ni, Fe) by powder metallurgy. It has excellent characteristics such as high strength, high hardness, high wear resistance, chemical corrosion resistance, small thermal expansion coefficie...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K35/30B23K101/20
Inventor 王朝
Owner 王朝
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