Novel brazing flux-containing aluminum alloy soldering wire and preparation method thereof

A technology of aluminum alloy welding wire and flux, applied in welding equipment, metal processing equipment, welding media, etc., can solve problems such as difficulty in adding flux, insufficient uniform composition of core flux and external metal, easy scattering of core powder, etc.

Inactive Publication Date: 2011-01-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can solve the problem of difficulty in adding flux, the gap of this tubular flux cored wire is easy to absorb moisture, the core powder is easy to scatter, and the composition of core flux and external metal is not uniform enough, which affects the welding quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In step 1, the prepared Al-Si alloy is heated, melted, refined and degassed in an induction furnace. The metal liquid flows through the leaking nozzle and flows into the spray device. In the high-pressure water flow, after cooling, the Al-Si powder slurry flows through the screen to filter out coarse metals and sundries, and then flows into a high-speed rotating dryer for dehydration treatment. After drying and sieving, the particle size is -45+105μm spherical powder;

[0019] Step 2, the quantitative molar ratio of AlF of 44.5:55.5 3 Mix evenly with KF, put it in a dry pot and heat it to 550℃, make it melt, keep warm for 20min, and then cool to room temperature. Grind the cooled flux to a particle size of -25+45μm by mechanical grinding;

[0020] Step 3, uniformly mix the aluminum-silicon brazing filler metal powder and fluoride brazing flux powder prepared in steps 1 and 2 according to a mass ratio of 93:7, and then vacuum-pack it for later use;

[0021] Step 4: Pr...

Embodiment 2

[0025] The difference from Example 1 is: in step 3, the aluminum-silicon solder powder and fluoride solder powder prepared in steps 1 and 2 are uniformly mixed at a mass ratio of 85:15, and then vacuum-packed for later use;

[0026] Step 4: Press the uniformly mixed powder at 250Mp for 5min with a cold isostatic press, and then put it into 10 -2 In the Pa vacuum sintering furnace, sintered at 500 ° C for 2 hours into a blank with a diameter of 40 mm, and cooled to room temperature with the furnace;

[0027] Step 5, place the blank made in step 4 on a 100-ton hot extruder with an extrusion ratio of 64:1, an extrusion speed of 2.2m / min, and an extrusion temperature of 450°C to extrude a wire blank with a diameter of 5mm;

[0028] Step 6: Reduce the diameter of the wire blank to a welding wire with a reduced diameter of 2 mm at a pulling speed of 3.7m / min on a disc wire drawing machine for 4 passes (5→4.25→3.25→2.56→2mm), and then degreasing the surface to obtain a finished weldi...

Embodiment 3

[0030] Others are the same as Example 1, but different from Example 1: Step 6, pass the wire billet on the swaging machine at a feed speed of 5m / min through 3 passes (5→4.15→2.56→2mm) of the wire with a reduced diameter of 2mm , and then the surface is degreased as a finished wire.

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Abstract

The invention discloses a brazing flux-containing aluminum alloy soldering wire and a preparation method thereof, which belong to the technical field of brazing materials. The soldering wire consists of uniformly mixed aluminum silicon brazing material powder and fluoride brazing flux powder, wherein the content of the aluminum silicon brazing material powder is 93 to 85 percent; the content of fluoride brazing flux powder is 7 to 15 percent; the aluminum accounts for 88 percent and the silicon accounts for 12 percent of the aluminum silicon brazing material powder; the fluoride brazing flux powder is potassium aluminum fluoride mixed salt consisting of KF-AlF3 series; and the molar ratio of AlF3 to KF is 44.5 to 55.5. The preparation process comprises the following steps of: preparing the aluminum silicon brazing material powder and the fluoride brazing flux powder; uniformly mixing the two kinds of powder, and performing cold isostatic pressing and vacuum sintering to prepare a blank; and extruding and drawing the blank on a thermal extruder to obtain a product. The soldering wire and the method have the advantages of shortening processing time and reducing waste treatment, along with high surface accuracy, no need of head rolling machine between passes, high material utilization ratio and high performance of soldering process.

Description

technical field [0001] The invention relates to a novel aluminum alloy welding wire containing flux and a preparation method thereof, belonging to the technical field of brazing materials. Background technique [0002] In recent years, with the rapid development of the automobile, air conditioning and refrigeration industries, gratifying progress has been made in replacing copper with aluminum and steel with aluminum. Flame brazing of aluminum refrigeration fittings, especially aluminum alloy pipe joints and connectors, is widely used. When this welded joint is flame brazed, flux must be applied to the surface of the wire or workpiece to remove oxides from the aluminum surface. At present, the flame brazing method using aluminum alloy welding wire with the addition of flux has the disadvantage that the amount and time of addition of flux are not easy to control. To solve this problem, it has been proposed to use tubular flux-cored wire as a self-flux welding material. Alt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
Inventor 雷永平欧星星
Owner BEIJING UNIV OF TECH
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