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Method for preparing alloy powder for manufacturing tubular welding wire

A technology of tubular welding wire and alloy powder, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problem that it is difficult to eliminate the uneven composition of the welding layer, and achieve unique uniformity of alloy composition, stable alloy composition, and crack resistance good performance effect

Inactive Publication Date: 2014-04-09
上海金刚冶金材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to eliminate the uneven composition of the welding layer caused by the difference in specific gravity of the formula alloy material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Taking furnace batch number 10# as an example to illustrate the smelting process and powder making process of prefabricated alloy powder

[0064] 1. Furnace lining: non-vacuum induction furnace lining;

[0065] 2. The melting weight is 120Kg;

[0066] 3. Melting process parameters:

[0067] AC voltage: 415~420V;

[0068] DC voltage: 400~415V;

[0069] DC current: 120~200A;

[0070] Intermediate frequency voltage: 600~620V;

[0071] IF frequency (Hz): 750~800;

[0072] 4. Add charge procedure and smelting process

[0073] Add all steel scrap, ferrotungsten, carbon powder and ferrovanadium, and half of low-carbon ferrochrome before starting the furnace;

[0074] Add the other half of low-carbon ferrochrome after energizing for 25 minutes;

[0075] Add monocrystalline silicon after power on for 30 minutes;

[0076] Add all ferromolybdenum after power on for 35 minutes;

[0077] Add electrolytic manganese after electrifying for 50 minutes;

[0078] Add silicon ca...

Embodiment 2

[0085] Continuous optimization of prefabricated alloy composition design, or high C, high Si or low Mn, all result in high hardness of the surfacing layer of the intermediate prefabricated alloy pipe wire. Only when C, Si are appropriately low, and Mn are appropriately high, can the intermediate alloy pipe be guaranteed Wire to obtain the appropriate hardness of the surfacing layer.

[0086] (1) Take furnace batch number 11# as an example to illustrate the influence of high C and Si in the alloy composition formula

[0087] .

[0088] (2) Taking furnace batch number 12# as an example, explain the influence of high Mn in the design of alloy composition formula

[0089] .

[0090] 3. Taking furnace batch number 13# as an example, it shows that in the design of the prefabricated alloy formula, C and Si are appropriately low, and Mn is appropriately high, which can ensure the appropriate hardness value of the surfacing layer of the intermediate alloy tube wire

[0091] ....

Embodiment 3

[0093] Induction furnace lining type corresponds to the experiment of the influence of the service life of the induction furnace and the experiment of the influence of the tapping pouring temperature on the clogging of the ladle sprue during the refining period.

[0094] 1. For the same alloy composition, if the acidic lining is used, the life of the induction lining is only 3 furnaces, while that of the basic furnace lining can reach 58 furnaces.

[0095] 2. For the same prefabricated alloy composition, basic furnace lining is also used. During the refining period, the pouring temperature of tapping is 1285°C, and 3 furnaces are continuously poured, and the ladle sprue is blocked; while the temperature of the tapping sprue during the refining period is 1585°C, 18 furnaces are poured continuously, and the ladle is The sprue is not blocked.

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Abstract

The invention belongs to the technical field of welding, in particular to alloy powder for manufacturing a tubular welding wire and a preparation method of the tubular welding wire. In the invention, according to the alloy phase change theory, the prefabricated alloy powder formula is changed, so that the repeatability and stability of alloying component in the batch production of the prefabricated alloy powder can be improved greatly. In the invention, the improved melting and pouring process of producing metal powder by being atomized by high pressure water is adopted, and the uniformity of the alloying components of the prefabricated alloy powder can be ensured. A method of test panel overlaying welding, welding layer component detection and heat cracking resistance test is adopted for checking the uniformity and good heat cracking resistance performance of components of an intermediate alloy tube wire overlaying layer prepared by the prefabricated powder. The tube wire product developed by the method of the invention is adopted and is matched with corresponding welding flux, the overlaying welding of physical rolls such as cold-heat pinch rolls, support rolls and vertical rolls shows that during the overlaying welding process, little fume is produced, the slag detachability is good, the welding pass forming property is good, pores and cracks do not exist on the overlaying layer and a crust, and the welding quality and the service life completely meet the engineering requirements.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to an alloy powder for manufacturing tubular welding wire and a preparation method thereof. Background technique [0002] The traditional submerged arc welding alloy pipe wire adopts conventional mixed alloy pipe wire, and the alloy powder used for preparing alloy pipe wire is obtained by preparing various alloy powders according to the composition formula of the pipe wire, and mechanically mixing them in a mixing tank. This method is difficult to eliminate the uneven composition of the welding layer caused by the difference in specific gravity of the formula alloy. [0003] In the process of manufacturing pipe wires from prefabricated alloy powder, firstly, the alloy formula of the pipe wires is melted in a non-vacuum induction furnace. Alloy composition uniformity of alloy powder. According to the use of tubular welding wire for submerged arc surfacing, the present ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40C22C38/38C22C33/06B22F9/08
Inventor 王俊明黄权朱亚忠郭炎
Owner 上海金刚冶金材料有限公司