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A kind of high-tin silver-based welding rod

A welding rod and silver-based technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of deterioration of solder processing performance, unsatisfactory, high-tin-silver solder cannot be made into welding rods, etc., to meet the welding requirements Production process requirements, easy operation, low cost effect

Active Publication Date: 2015-08-19
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the use of solder, in order to further reduce the melting temperature of the solder and improve the wettability of the solder to reach the level of the solder containing Cd, it is necessary to further increase the tin content, but the brittleness of the high-tin-silver electrode will cause solder The processing performance of the material deteriorates, so that the high-tin-silver solder cannot be made into welding rods, which cannot meet the welding needs of brazing electrical and electronic workpieces.

Method used

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  • A kind of high-tin silver-based welding rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Preparation of Ag29Cu35Zn30Sn6 electrode

[0020] The first step is to atomize tin (Sn) and copper (Cu) with a lower melting point into alloy powder according to the weight ratio of Cu20 and Sn80;

[0021] The second step is to melt the alloy ingot according to the percentage ratio of silver (Ag): 31.5%, copper (Cu): 35.9%, zinc (Zn): 32.6%:

[0022] 1. Melt copper in an intermediate frequency furnace, add silver when the temperature reaches 1150~1200°C, and cover it with a compound salt prepared with dehydrated borax and boric anhydride in a weight ratio of 7:3 after fully melting; reduce the temperature of the molten metal to 950~1000°C ℃, add zinc;

[0023] 2. After the zinc is fully fused, the metal solution is allowed to stand still for 30-60 minutes and then poured into an ingot with an outer diameter of 90mm;

[0024] The third step is to remove the outer skin of the cast ingot and perform homogenization annealing in a box-type resistance furnac...

Embodiment 2

[0028] Embodiment 2: Preparation of Ag44Cu26Zn23Sn7 electrode

[0029] The first step, with embodiment 1;

[0030] The second step is to melt the alloy ingot according to the percentage ratio of silver (Ag): 48.2%, copper (Cu): 26.6%, zinc (Zn): 25.2%:

[0031] 1. Melt copper in an intermediate frequency furnace, add silver when the temperature reaches 1150~1200°C, and cover it with a compound salt prepared with dehydrated borax and boric anhydride in a weight ratio of 7:3 after fully melting; reduce the temperature of the molten metal to 950~1000°C ℃, add zinc;

[0032] 2. After the zinc is fully fused, the metal solution is allowed to stand still for 30-60 minutes and then poured into an ingot with an outer diameter of 90mm;

[0033] The third step to the fifth step are the same as in Embodiment 1.

example 3

[0034] Example 3: Preparation of Ag55Cu21Zn16Sn8 electrode:

[0035] The first step, with embodiment 1;

[0036] The second step is to melt the alloy ingot according to the percentage ratio of silver (Ag): 61.1%, copper (Cu): 21.2%, zinc (Zn): 17.8%:

[0037] 1. Melt copper in an intermediate frequency furnace, add silver when the temperature reaches 1150~1200°C, and cover it with a compound salt prepared with dehydrated borax and boric anhydride in a weight ratio of 7:3 after fully melting; reduce the temperature of the molten metal to 950~1000°C ℃, add zinc;

[0038] 2. After the zinc is fully fused, the metal solution is allowed to stand still for 30-60 minutes and then poured into an ingot with an outer diameter of 90 mm;

[0039] The third step to the fifth step are the same as in Embodiment 1.

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Abstract

The invention discloses a high-tin silver-based welding rod, which is prepared from raw materials: silver: 24-61%, copper: 20-41%, zinc: 12-35%, tin: 6-12%. During preparation, the raw materials copper and tin are first atomized into alloy powder in proportion; then the copper is melted, and silver is added when the temperature reaches a certain level, and then covered with compound salt after fully fused; then the metal solution is cooled down, and zinc is added to continue to fuse; After fusion, the metal solution is stilled and poured into ingots; the ingots are rough-turned and put into a resistance furnace for homogenization and annealing, and extruded into 3.5mm strips; after online annealing, multi-pass small-ratio rolling to a thickness of 0.2mm The thin strip; then combined with the atomized alloy powder through a flux-cored wire machine, drawn, and cut to obtain a finished electrode with a diameter of 1.0~2.5mm. The invention has the advantages that the preparation method is easy to operate, good in stability and low in cost, and solves the problem that the high-tin-silver-based solder is difficult to be processed into welding rods.

Description

technical field [0001] The invention relates to high-tin-silver solder, in particular to a high-tin-silver-based welding rod suitable for brazing electric appliances and electronics that do not bear impact and bending workpieces, and also relates to a preparation method of the welding rod. Background technique [0002] Silver solder containing cadmium (Cd) is the solder with the best manufacturability among all silver solders, with ideal strength and processing performance. Since cadmium is a toxic element and is extremely volatile, cadmium vapor is a toxic gas, and its oxide It is also toxic, so the use of cadmium-containing solder not only endangers the health of welding operators, but also affects the surrounding environment. The pollution of the environment by its production and use has become a global problem. The WEEE and RoHS directives promulgated by the European Union stipulate that materials containing cadmium are not allowed to be used in home appliances, and they...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/40
CPCB23K35/3006B23K35/40
Inventor 龙伟民张冠星裴夤崟钟素娟张强马佳樊江磊鲍丽王洋赵建昌黄小勇
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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