Welding method of black metal

A technology of ferrous metals and welding methods, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of high cost surface cleaning costs, difficult to stably fuse the interface, and difficult to meet actual working conditions, so as to reduce process costs, Good welding, save the effect of equipment investment

Active Publication Date: 2014-07-16
CHANGSHA VIBO WEARABLE MATERIAL CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Ferrous metal composite materials are widely used due to their excellent performance. Brazing is an important method to realize the preparation of ferrous metal composite materials. At present, a reducing atmosphere process is commonly used. Because the interface between ferrous me

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (I) The natural graphite with a carbon content of more than 99% is ground by mechanical ball milling, and then sieved-classified, and the average particle size is 300-380 μm Graphite powder, then add forming agent-rubber to the graphite powder, then granulate, and punch it into a sheet with a thickness of 0.05 mm on a punching machine to obtain a sheet-shaped graphite solder.

[0017] (II) Place the obtained flake graphite brazing material between carbon steel-cast iron welded parts to form a "sandwich" shape, and then place the whole in a high-temperature furnace with ammonia decomposition gas to keep the above In this atmosphere, heating to 1100°C, keeping the temperature for more than 3 hours, and then taking it out of the furnace after cooling can achieve good welding of the two materials. The welded material is inspected by ultrasonic flaw detection, and no defective spot is found in the weld. After testing, the strength of the welded joint can reach more than 350...

Embodiment 2

[0019] Adopt the method substantially identical with embodiment 1 to weld stainless steel -- high chromium cast iron, following parameter has difference: adopt the graphite product waste material that carbon content is more than 90% to make raw material, the average particle diameter of the graphite powder after grinding is 420 ~500μm; the thickness of flake graphite solder is 0.09mm; heat preservation is over 10 hours; hydrogen gas is introduced into the high temperature furnace.

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Abstract

The invention provides a welding method of black metal. The welding method of the black metal comprises the steps that firstly, high-molecular polymer plasticizers are added to graphite raw material particles with the carbon content larger than 90%, then the graphite raw material particles are punched into flakes, and therefore flaky brazing filler metal is obtained; secondly, the flaky brazing filler metal is arranged between black metal workpieces to be welded, then the black metal workpieces with the flaky brazing filler metal are wholly arranged in a high-temperature container at least containing reductive atmosphere of hydrogen, the reductive atmosphere is kept, heat is preserved for a period of time, and the black metal workpieces with the flaky brazing filler metal are cooled. By means of the welding method of black metal, good welding between black metal (congener and heterogeneous) materials can be achieved, the process of cleaning and special surface pretreatment for the workpieces to be welded is not needed, equipment investment is reduced, and process cost is lowered. Meanwhile, brazing filler metal graphite can be extracted from widespread resources, and the cost of raw materials can be lowered.

Description

technical field [0001] The invention relates to a metal welding method, in particular to a welding method between ferrous metals. Background technique [0002] At present, in the field of metal industry, metals are usually divided into ferrous metals and non-ferrous metals. Ferrous metals mainly refer to iron, manganese, chromium and their alloys, such as steel, pig iron, iron alloys, cast iron, etc. Ferrous metal composite materials are widely used due to their excellent performance. Brazing is an important method to realize the preparation of ferrous metal composite materials. At present, a reducing atmosphere process is commonly used. Because the interface between ferrous metals is difficult to fuse stably during brazing, there are Brazed joints are low in strength, difficult to meet the needs of actual working conditions, and require a large amount of equipment investment and high cost of surface cleaning, resulting in high production costs. [0003] Contents of the i...

Claims

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Application Information

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IPC IPC(8): B23K1/19
CPCB23K1/19
Inventor 王韩希邱娟
Owner CHANGSHA VIBO WEARABLE MATERIAL CO LTD
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