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Low silver copper base medium temperature brazing filler metal

A copper-based, brazing technology, applied in welding/cutting media/materials, welding media, metal processing equipment, etc., can solve the problems of brazing performance inferior to silver brazing, irreplaceable, high melting temperature, and reduce brazing The effect of temperature, good compactness and high mechanical strength

Active Publication Date: 2009-09-09
HANGZHOU HUAGUANG ADVANCED WELDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional copper-based solders such as BCu89PAg, BCu91PAg, etc., although the price is lower, but the melting temperature is higher, the brazing performance is not as good as silver solder in the welding of copper and copper alloys, copper and Bondi tubes, so it cannot replace BAg25CuZnSn Silver solder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the proportion by weight of the alloy, its composition is as follows: Ag: 1.8%, P: 5.5%, In: 0.5%, Ni: 0.03%, Ga: 0.01%, and the balance is Cu.

[0014] The low-silver copper-based medium-temperature brazing material obtained by the above-mentioned composition ratio according to the conventional processing technology has a solidus temperature of about 645°C and a liquidus temperature of about 710°C, and can be drawn into wires with a diameter of Φ0.5mm or more. Good; good wettability and fluidity on copper, copper alloy and carbon steel, with a wetting angle of 2°-4° and a tensile strength of 515MPa.

Embodiment 2

[0016] According to the proportion by weight of the alloy, its composition is as follows: Ag: 2.1%, P: 6.0%, In: 0.8%, Ni: 0.05%, Ga: 0.03%, and the balance is Cu.

[0017] The low-silver copper-based medium-temperature brazing material obtained by the above-mentioned composition ratio according to the conventional processing technology has a solidus temperature of about 645°C and a liquidus temperature of about 705°C, and can be drawn into wires with a diameter of Φ0.5mm or more. Good; good wettability and fluidity on copper, copper alloy and carbon steel, with a wetting angle of 2°-4° and a tensile strength of 510MPa.

Embodiment 3

[0019] According to the proportion by weight of the alloy, its composition is as follows: Ag: 2.5%, P: 6.5%, In: 1.2%, Ni: 0.1%, Ga: 0.05%, and the balance is Cu.

[0020] The low-silver copper-based medium-temperature brazing material obtained by the above-mentioned composition ratio according to the conventional processing technology has a solidus temperature of about 640°C and a liquidus temperature of about 700°C, and can be drawn into wires with a diameter of Φ0.4mm or more. Good; good wettability and fluidity on copper, copper alloy and carbon steel, with a wetting angle of 2°-4° and a tensile strength of 495MPa.

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Abstract

The invention relates to a low silver copper base medium temperature brazing filler metal applicable to braze welding of workpieces such as copper and copper alloy, copper and steel, belonging to the field of medium temperature brazing material. The formula and content of the low silver copper base medium temperature brazing filler by weight percentage is as follows: Ag: 1.8-5%, P: 5.5-7.5%, In: 0.5-2.5%, Ni: 0.01-1%, the rest: Cu. The invention has the advantages of rational design of formula, low manufacture cost, relatively low melting temperature of the brazing filler metal when welding copper and copper alloy and copper and bundy tubes, good wetting property and fluidness, smooth and bright surface of soldered connection, high mechanical strength, fine processing property of braze welding, stable quality and good uniformity and capability of replacing noble metal silver brazing filler metal BAg25CuZnSn.

Description

technical field [0001] The invention relates to a low-silver copper-based medium-temperature brazing material, which is suitable for brazing workpieces such as copper and copper alloys, copper and steel, and belongs to the field of medium-temperature brazing materials. Background technique [0002] In recent years, the demand for household appliances represented by air conditioners and refrigerators has gradually increased, and the demand for brazing materials for valve fittings and compressor pipelines has also increased. BAg25CuZnSn silver solder is widely used in the welding of copper and copper alloys, copper and Bondi tubes in air-conditioning, refrigeration and other industries, and its various performance indicators have reached a high level. However, the silver solder needs to use about 25% of the precious metal silver. As the price of raw materials is getting higher and higher, manufacturers who are used for brazing in refrigeration, machinery, electromechanical, el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
Inventor 金李梅王晓蓉刘静郭志刚
Owner HANGZHOU HUAGUANG ADVANCED WELDING MATERIALS CO LTD
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