A kind of thermite welding powder and its preparation process and application method
A preparation process, a thermite welding technology, applied in the direction of welding equipment, manufacturing tools, welding media, etc., can solve the problems of spontaneous combustion or explosion, inconvenient use of thermite welding powder, etc., and achieve the goals of reducing conductivity, increasing ignition point, and high ignition point Effect
Active Publication Date: 2020-08-18
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 combustion or explosion at a certain concentration, so it is very dangerous during transportation. It has caused some inconvenience to the use of thermite welding powder
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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 aluminum powder and copper powder with a ball mill to make mixed powder A, and grinding the mixed powder A with stainless steel balls with a diameter of 8mm in the ball milling medium at a speed of 226r / min 3h;
[0069] S11b: Grinding of rare earth powder and zirconium powder: Grinding calcium powder and zirconium powder with a ball mill to make mixed powder B, and grinding the mixed powder B with stainless steel balls with a diameter of 5mm in the ball milling medium at a speed of 226r / min 6h;
[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 ...
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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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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