Flux-free aluminum brazing sheet

A technology of aluminum brazing and brazing material, which is applied in the direction of welding equipment, welding medium, welding/cutting medium/material, etc.

Active Publication Date: 2020-01-21
MA ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, it is difficult to say that stable jointability can be obtained to the extent that it can replace the current mainstream soldering method using fluoride-based fluxes. In order to be widely used in general heat exchangers, further improvement of technology is required.

Method used

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  • Flux-free aluminum brazing sheet
  • Flux-free aluminum brazing sheet
  • Flux-free aluminum brazing sheet

Examples

Experimental program
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Effect test

Embodiment

[0145] For various brazing sheets with the compositions shown in Tables 1 to 6 (core material, brazing filler metal, sacrificial material; the remainder being Al and unavoidable impurities), under the casting conditions and hot rolling conditions shown in Table 7 , produced a hot-rolled plate.

[0146] In addition, no sacrificial material was used for the test material whose composition of the sacrificial material is indicated by "-".

[0147]Then, by cold rolling including an intermediate annealing step, a cold-rolled sheet having a thickness of 0.30 mm in the H14 equivalent temper was produced. In addition, the coating ratio of each layer was 10% of brazing material and 15% of sacrificial material.

[0148] Furthermore, corrugated fins of A3003 alloy and H14 aluminum bare material (thickness 0.06 mm) were prepared as brazing target members.

[0149] Use the aluminum brazing plate to make a tube with a width of 25 mm, and combine the tube and corrugated fins so that the tub...

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Abstract

The invention provides an aluminum brazing sheet for fluxless brazing, which is used for brazing in a non-oxidizing atmosphere without using a flux and without a reduced pressure. Al-Si-Mg-Bi series solder coatings containing 0.01 to 2.0% of Mg, 1.5 to 14.0% of Si, and 0.05 to 1.5% of Bi by mass% is located on the outermost surface by covering one or both sides of the core material. The Mg-Bi-based compound contained in the Al-Si-Mg-Bi-based solder has an equivalent circle diameter of 0.01 [mu] m or more and less than 5. There are more than 10 Mg-Bi compounds with a diameter of 0 [mu] m in thefield of view per 10,000 [mu] m2; The field of view of 10,000 m2 is less than two. When the particles of Bi element contained in the brazing material are viewed from the surface layer surface beforebrazing, the particles of Bi element having a diameter of 5.0 [mu] m or more in terms of equivalent circle diameter per 10,000 [mu] m2 Field of view is less than 5.

Description

technical field [0001] The present invention relates to an aluminum brazing sheet for fluxless brazing that is joined by fluxless. Background technique [0002] With regard to heat exchangers for automobiles made of aluminum such as radiators, the aluminum material has become thinner and stronger in line with the previous miniaturization and weight reduction. In the manufacturing process of aluminum heat exchangers, brazing is performed to join the joints, but in the current mainstream brazing method using fluoride-based fluxes, the fluxes are not activated because they react with Mg in the material In addition, poor brazing is likely to occur, so the utilization of Mg-added high-strength components is limited. Therefore, a brazing method for joining Mg-added aluminum alloys without using flux is desired. [0003] In flux-free soldering using Al-Si-Mg solder, the Al oxide film (Al 2 o 3 ) undergo reductive decomposition to join. In closed surface joints, etc., the joint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/02C22C21/08C22C21/10C22C21/14C22C21/16B23K35/28B32B15/01B32B15/20
CPCC22C21/02C22C21/00C22C21/08C22C21/14C22C21/16C22C21/10B23K35/288B32B15/016B23K35/0238B23K35/286F28F21/084F28D1/05366F28F1/126F28F21/089F28F2275/04C22F1/043C21D8/0226C21D8/0247B32B15/00B32B15/01
Inventor 森祥基三宅秀幸吉野路英岩尾祥平江户正和
Owner MA ALUMINUM CORP
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