Flux-cored silver solder and preparation method thereof

A technology of silver solder and silver-based solder, used in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problem that the solder cannot normally wet the welding base material, affect the quality of the flux core solder, and the forming process is complicated. problems, to achieve the effect of reducing labor intensity and environmental pollution, low cost and good craftsmanship

Active Publication Date: 2017-10-31
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

[0006] Chinese patent CN102513726 A discloses "silver-based flux-cored welding wire and its manufacturing method", which records a method for manufacturing silver-copper-zinc seamless flux-cored welding wire using a seamless extrusion core filling production process; The weight of the ingot is limited, the production efficiency has certain limitations, and there is also a hidden danger of flux breakage
Chinese patent CN104384744 A discloses "a method for preparing a flux-cored electrode", which records that the thin strip of silver brazing material is rolled and deformed to form a U-shaped strip with an upward opening, and the U-shaped strip that is added with silver brazing flux is rolled by a roll It is deformed into a flux-cored welding wire with an overlapping tubular structure. The flux in the flux-cored silver solder produced by this method is relatively compact, has no gaps, and has a stable content, but the forming process is more complicated and the cost is higher.
It is difficult to avoid the existence of tiny gaps in the butt joints of the existing butt joint flux-cored silver solder made by rolling. During transportation and use, the existing gaps are prone to powder leakage (flux leaks out of the solder tube) At the same time, impurities, dirt and water vapor can easily enter the inner core through this gap, affecting the quality of the flux core solder, resulting in the solder not being able to wet the base metal normally.

Method used

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  • Flux-cored silver solder and preparation method thereof
  • Flux-cored silver solder and preparation method thereof

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preparation example Construction

[0027] The preparation method of flux-cored silver solder of the present invention comprises the following steps:

[0028] In the first step, carry out the smelting of the silver-based solder ingot according to the conventional method, and prepare a strip-shaped solder;

[0029] The second step is to roughen the inner surface of the strip-shaped solder. The specific method can be sandblasting, mechanical friction or directly processed into an uneven surface with grooves to avoid flux flow during processing;

[0030] In the third step, the strip-shaped solder is rotated and rolled into a spiral tubular structure with the lap joint 3, and silver solder (in powder, paste or block) is added into the tube during the rolling process to form a solder joint. core 2;

[0031] The fourth step is to manufacture a flux-cored silver solder that meets the requirements through a conventional rolling or drawing process. The obtained finished flux-cored silver solder can be further processed...

Embodiment 1

[0034] Flux core silver solder of the present invention, its preparation method is as follows:

[0035] a) Silver, copper, and zinc are mixed in proportion and smelted, and cast into a Φ50 mm rod-shaped BAg45Cu30Zn25 solder ingot, cut off the riser, and then turn the ingot to remove the scale for use;

[0036] b) Raise the temperature of the solder extrusion equipment to 460 °C, place the turned ingot in the muffle furnace for preheating, the preheating temperature is 470 °C, put the preheated ingot into the mold of the extrusion equipment Inside, extrude into a strip-shaped solder with a thickness of 5.0 mm and a width of 8.5 mm, and make a strip of solder with a thickness of 0.2 mm and a width of 7.5 mm;

[0037] c) Sandblasting and roughening one side of the strip-shaped solder;

[0038] d) Evenly mix silver brazing flux containing 15% borax, 10% potassium fluoride, 20% potassium fluoroborate, and 55% boric acid, dry in a low-vacuum drying oven at 100°C~130°C for 200min, a...

Embodiment 2

[0042] Flux core silver solder of the present invention, its preparation method is as follows:

[0043]a) Silver, copper, zinc, and tin are prepared in proportion and smelted, and cast into a Φ50 mm rod-shaped BAg34Cu36Zn27.5Sn2.5 solder ingot, cut off the riser, and then turn the ingot to remove the scale for use;

[0044] b) Raise the temperature of the solder extrusion equipment to 460 °C, place the turned ingot in the muffle furnace for preheating, the preheating temperature is 470 °C, put the preheated ingot into the mold of the extrusion equipment Inside, extrude into a strip-shaped solder with a thickness of 5.5 mm and a width of 8.6 mm, and make a strip of solder with a thickness of 0.2 mm and a width of 7.8 mm;

[0045] c) Process grooves on one side of the strip-shaped solder to form an uneven surface;

[0046] d) Evenly mix silver brazing flux containing 42% potassium fluoride, 23% potassium fluoroborate, and 35% boron anhydride, dry in a low-vacuum drying oven at ...

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Abstract

The invention discloses flux-cored silver solder. The silver solder comprises a silver-based solder outer layer and a silver brazing flux core placed inside the silver-based solder outer layer in a padded mode, and the silver-based solder outer layer is formed by rotating and rolling strip-shaped solder and is of a tubular structure provided with spiral lapped seams. The preparation method comprises the steps of smelting and producing out the strip-shaped silver-based solder according to a conventional method, and conducting roughening treatment on the inner surface; then rotating and rolling the strip-shaped solder into the tubular structure in a spiral shape, and adding silver brazing flux into the tube in the rolling process so that the flux core can be formed; producing out the flux-cored silver solder which meets the requirements through the rolling or drawing process. The flux-cored silver solder and the preparation method thereof have the advantages that the brazing flux can be added in advance conveniently and efficiently, the brazing process has the advantages of being convenient to assemble, easy to achieve automatized production, low in cost and the like, and it is facilitated to apply and promote the automatized brazing technique.

Description

technical field [0001] The invention relates to welding materials, in particular to a flux-cored silver solder, and also relates to a preparation method of the flux-cored silver solder. Background technique [0002] Silver solder has a moderate melting point, good welding processability, good strength, toughness, electrical conductivity, thermal conductivity and corrosion resistance, and is the most widely used type of hard solder. In recent years, my country's air-conditioning and refrigeration industries have bottomed out and rebounded after experiencing the trough of the 2008 economic crisis. Especially in 2013, with the support of policies such as national urbanization construction, home appliances going to the countryside, and subsidies for energy saving and benefiting the people, they quickly stabilized and rebounded, becoming silver brazing materials. The application provides room for sustainable growth. [0003] The traditional brazing process is to use wire or strip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40B23K35/363
CPCB23K35/0227B23K35/3006B23K35/302B23K35/3605B23K35/3606B23K35/362B23K35/406
Inventor 龙伟民钟素娟吕登峰鲍丽于新泉潘建军赵建昌张宏超杜全斌
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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