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Vacuum brazing welding piece blank material and preparation method thereof

A technology of brazing and soldering sheet, which is applied in the field of soldering sheet blanks for vacuum brazing and its preparation, can solve problems such as easy occurrence of holes in blanks, increased material consumption, and difficulties in blank production, achieving good application prospects and economic benefits, reducing Component segregation, the effect of satisfying the membrane breaking effect

Inactive Publication Date: 2020-07-28
JIANGSU DINGSHENG NEW MATERIAL JOINT STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vacuum brazing of aluminum alloy materials generally uses 4004 alloy as solder, which has a high silicon content, generally 9.0% to 10.5%, and a high magnesium content, generally 1.0% to 2.0%, which is expensive and consumes a lot. It is easy to cause solder loss and increase material consumption, and the billet is generally produced by hot rolling, which has high cost and long production cycle
However, the 4004 solder produced by casting and rolling is difficult to produce blanks, low in efficiency, low in yield, prone to holes in the blanks, and easy to break in subsequent rolling processing.

Method used

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  • Vacuum brazing welding piece blank material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a welding sheet blank for vacuum brazing, comprising the following steps:

[0023] S1. Raw material preparation: including aluminum ingots, scrap aluminum, aluminum-silicon master alloys and primary magnesium ingots;

[0024] S2. Melting: adding aluminum ingots, waste aluminum and aluminum-silicon master alloy to the melting furnace, igniting and melting;

[0025] S3. Smelting: After the above-mentioned raw materials are completely liquefied into aluminum water, the silicon content is adjusted with the aluminum-silicon intermediate alloy, and then the aluminum water is heated to 720°C and introduced into a static furnace, and an iron cage is used to add primary magnesium ingots in the static furnace , carry out the allocation of magnesium content, after twice component allocation, the silicon content is 8.5%, the magnesium content is 0.25%;

[0026] S4. Casting and rolling. Casting and rolling are carried out at a casting temperature of 640° C. a...

Embodiment 2

[0028] The method described in Example 1 was used to prepare the blank for vacuum brazing. In the S3 step, the aluminum water was heated to 730°C and introduced into the static furnace. After the alloy components were prepared twice, the silicon content was 8.7%, and the magnesium content was 0.28%. ; In step S4, the casting and rolling temperature is 648° C., the casting and rolling speed is 580 mm / min, and the obtained cast and rolling coil has a thickness of 6 mm.

Embodiment 3

[0030] The method described in Example 1 was used to prepare the blank for vacuum brazing. In step S3, the aluminum water was heated to 733°C and introduced into a standing furnace. After the alloy components were prepared twice, the silicon content was 8.2%, and the magnesium content was 0.35%. ; In step S4, the casting and rolling temperature is 645° C., the casting and rolling speed is 620 mm / min, and the obtained cast and rolling coil has a thickness of 6.6 mm.

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Abstract

The invention discloses a vacuum brazing welding piece blank material and a preparation method thereof. The preparation method comprises the following steps that raw materials are prepared, and the raw materials comprise an aluminium ingot, waste aluminum and aluminum-silicon intermediate alloy; the raw materials are added into a smelting furnace and are ignited to be melted; after the raw materials are completely liquefied into aluminum water, silicon content blending is firstly performed, then the aluminum water is guided into a standing furnace to perform magnesium content blending, after the two-time ingredient blending, the silicon content is not more than 9.0%, and the magnesium content is not more than 0.35%; and cast rolling is performed to obtain cast rolling rolls, namely the vacuum brazing welding piece blank material. According to the vacuum brazing welding piece blank material and the preparation method thereof provided by the invention, the production cycle is short, material consumption is low, and the blank material has no holes, is not prone to breaking and is easy to roll.

Description

technical field [0001] The invention belongs to the technical field of aluminum material processing, and in particular relates to a welding sheet blank for vacuum brazing and a preparation method thereof. Background technique [0002] Conventional vacuum brazing is to spread the cleaned parts to be welded with welding materials (generally 4-series metal welding sheets), assemble them with another piece of materials to be welded, fasten them with a fixing device, and put them in a vacuum furnace. High-temperature welding, the melting point of the solder is lower than the melting point of the welding parts. At a certain high temperature, the parts to be welded will be bonded together after the solder melts. The good wettability and fluidity of the solder is used to fully contact the solder with the welding material to achieve welding. Gapless bonding of materials, i.e. complete welding. [0003] In the vacuum atmosphere, the oxidation of the surface of the welded parts at hig...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/286B23K35/40
Inventor 董则防吴保剑王毓玮
Owner JIANGSU DINGSHENG NEW MATERIAL JOINT STOCK CO LTD
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