Exothermic welding powder and preparation process and application method thereof

A preparation process, aluminothermic welding technology, applied in manufacturing tools, welding equipment, welding media, etc., can solve problems such as spontaneous combustion or explosion, inconvenient use of aluminothermic welding powder, etc., to reduce electrical conductivity, improve ignition point, and increase resistance. Effect

Active Publication Date: 2018-10-19
江苏银锐通电工设备有限公司
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Problems solved by technology

[0004] The traditional thermite welding powder used for welding copper parts contains a large amount of aluminum powder, and the aluminum powder is prone to spontaneous

Method used

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  • Exothermic welding powder and preparation process and application method thereof
  • Exothermic welding powder and preparation process and application method thereof
  • Exothermic welding powder and preparation process and application method thereof

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Experimental program
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preparation example Construction

[0066] S1, the preparation of aluminum-copper alloy:

[0067] S11, aluminum powder, copper powder, calcium powder and zirconium powder are ball milled using a ball mill;

[0068] S11a: Grinding of aluminum powder and copper powder: Grinding the aluminum powder and copper powder with a ball mill, and grinding the mixed powder A for 3 hours with a stainless steel ball with a diameter of 8 mm as a ball milling medium at a speed of 226 r / min;

[0069] S11b: Grinding of rare earth powder and zirconium powder: Grinding the calcium powder and zirconium powder with a ball mill, and grinding the mixed powder B with stainless steel balls with a diameter of 5 mm in the ball milling medium for 6 hours at a speed of 226 r / min;

[0070] S12. Melting of aluminum-copper alloy: add the ground aluminum powder, copper powder, calcium powder, and zirconium powder into a vacuum melting furnace, and melt at a temperature of 1200°C for 3 hours;

[0071] S13. Rapid solidification of aluminum-copper ...

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Abstract

The invention relates to the technical field of exothermic welding, in particular to exothermic welding powder and a preparation process and an application method thereof, and solves the problem of easy spontaneous combustion or explosion of the exothermic welding powder. The exothermic welding powder comprises 50-65 mass parts of aluminum copper alloy, 120-150 mass parts of copper oxide, 3-5 massparts of nickel, 3-5 mass parts of calcium fluoride, 3-4 mass parts of calcium oxide, 2-3 mass parts of chromium, 2-3 mass parts of silicon, 1-2 mass parts of boron, 1-2 mass parts of barium, 0.5-1 mass part of platinum. Traditional welding powder is easy to generate spontaneous combustion or explosion; the root cause is that aluminum powder in the traditional welding powder is easy to generate spontaneous combustion or explosion; aluminum copper alloy powder is higher in combustion point compared with common aluminum powder; the combustion point of the common aluminum powder is about 550 DEGC; and the combustion point of the aluminum copper alloy powder is increased above 730 DEG C, so that the combustion point is increased by above 32%, and the safety of the welding powder in the transportation process is improved.

Description

technical field [0001] The invention relates to the technical field of aluminothermic welding, in particular to an aluminothermic welding powder, a preparation process and a use method thereof. Background technique [0002] Aluminothermic welding is a welding method that uses the aluminothermic reaction between metal oxides and aluminum powder to produce superheated molten metal to connect the weldments that need to be connected. [0003] The traditional aluminothermic welding powder includes aluminum powder and metal oxide. Through the aluminothermic reaction (redox reaction) between aluminum powder and metal oxide, aluminum oxide and metal are formed, and a large amount of heat is released at the same time to melt the formed metal and Connects between two weldments so that the two weldments are welded together. Thermite welding is also often used in the welding of copper parts. [0004] The traditional thermite powder used for welding copper parts contains a large amount...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/40B23K35/22
CPCB23K35/22B23K35/24B23K35/40
Inventor 倪伟峰陆美虹钱国强
Owner 江苏银锐通电工设备有限公司
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