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A kind of preparation method of tin-bismuth alloy welding wire

A technology of tin-bismuth alloy and welding wire, which is applied in the field of preparation of tin-bismuth alloy welding wire, can solve problems such as core wrapping, and achieve the effects of improving plasticity, improving deformation ability, and improving plasticity

Active Publication Date: 2021-11-05
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the core wrapping problem caused by the poor welding of the end faces between the extruded ingots in the prior art of preparing tin-bismuth alloy welding wire by extrusion and drawing, thereby providing a tin-bismuth alloy welding wire preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a method for preparing a tin-bismuth alloy welding wire with a diameter of 0.5 mm, comprising the following steps:

[0033] (1) Prefabricated alloy

[0034] According to the mass ratio of bismuth and tin is 58:42, the raw materials are prepared, placed in an iron pot electric furnace, heated, after the tin ingots and bismuth ingots are completely melted, fully stirred for several minutes, and cast into small ingots after the stirring is stopped. The ingot is in the shape of a long strip of about 1 kg.

[0035] (2) Continuous smelting and down-draw continuous casting

[0036] The above pre-prepared tin-bismuth alloy ingots were melted in a resistance furnace with a down-drawing continuous casting device, and the casting device was equipped with eight down-drawing crystallizers with a diameter of 6 mm. The resistance furnace uses an iron crucible as a container, the effective height of the crucible is 300 mm, and a liquid level height scale is s...

Embodiment 2

[0043] This embodiment provides a method for preparing a tin-bismuth alloy welding wire with a diameter of 1.2mm, comprising the following steps:

[0044] (1) Prefabricated alloy

[0045] According to the mass ratio of bismuth and tin is 58:42, the raw materials are prepared, placed in an iron pot electric furnace, heated, after the tin ingots and bismuth ingots are completely melted, fully stirred for several minutes, and cast into small ingots after the stirring is stopped. The ingot is in the shape of a long strip of about 1 kg.

[0046] (2) Continuous smelting and down-draw continuous casting

[0047] The above pre-prepared tin-bismuth alloy ingots were melted in a resistance furnace with a down-drawing continuous casting device, and the casting device was equipped with a down-drawing crystallizer with a diameter of 12 mm. The resistance furnace uses an iron crucible as a container, the effective height of the crucible is 400mm, and a liquid level height scale is set on ...

Embodiment 3

[0054] This embodiment provides a method for preparing a tin-bismuth alloy welding wire with a diameter of 1.0 mm, comprising the following steps:

[0055] (1) Prefabricated alloy

[0056] According to the mass ratio of bismuth and tin is 58:42, the raw materials are prepared, placed in an iron pot electric furnace, heated, after the tin ingots and bismuth ingots are completely melted, fully stirred for several minutes, and cast into small ingots after the stirring is stopped. The ingot is in the shape of a long strip of about 1 kg.

[0057] (2) Continuous smelting and down-draw continuous casting

[0058] The pre-prepared tin-bismuth alloy ingot was melted in a resistance furnace with a down-draw continuous casting device, and the casting device was equipped with eight down-draw crystallizers with a diameter of 8 mm. The resistance furnace uses an iron crucible as a container, the effective height of the crucible is 300 mm, and a liquid level height scale is set on the inne...

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Abstract

The invention relates to the technical field of welding wire preparation, and specifically discloses a preparation method of tin-bismuth alloy welding wire. In the continuous rolling step, the tin-bismuth alloy is hot-rolled at a specific deformation rate and deformation temperature. , bismuth atoms can be solid-dissolved in the lattice of tin to a large extent, reduce the equivalent of bismuth phase, and improve the plasticity of the alloy; under the specific conditions of the present invention, the deformability of tin is significantly increased, the yield strength is reduced, and the softening ability is greatly improved Reinforced, it can rapidly deform under external stress, resolve the stress impact, and prevent the matrix from cracking. As the deformation progresses, although the bismuth phase breaks during "rolling" and mutual friction, it will produce fine lines, but the deformation is slower. At high speed, the fine lines will be quickly filled with tin, and the alloy shows good plasticity macroscopically, which provides favorable conditions for subsequent continuous wire drawing.

Description

technical field [0001] The invention relates to the technical field of welding wire preparation, in particular to a preparation method of tin-bismuth alloy welding wire. Background technique [0002] Lead-tin solder mainly contains lead, tin and a small amount of other alloy elements. It has the advantages of low melting point, high strength, good process performance, abundant resources and low price. It is an extremely ideal electronic soldering material and is widely used in the electronics industry. application. According to the survey, at present, more than 90% of electronic products will be recycled by waste collectors after being used by consumers for a certain period of time, and some electronic products are disassembled without any protective measures. The lead metal contained in these electronic products It is highly toxic, and long-term exposure will seriously endanger human health. With the increasing awareness of human environmental protection, people have real...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/40
CPCB23K35/40
Inventor 李明茂汤莹莹
Owner JIANGXI UNIV OF SCI & TECH
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