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Preparation method for Sn-58Bi welding wire

A technology of sn-58bi and welding wire, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of inability to prepare high Bi content, uneven grain size on the surface, and inability to continue production, etc., and achieve good social benefits and The effect of economical benefit, uniform organization and easy operation

Inactive Publication Date: 2016-06-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent document CN103146955A, the traditional smelting-casting-extrusion method is used. After extrusion, the grains are refined. The core structure of the product is uniform and fine, but the grain size of the surface layer is uneven.
During the preparation process, the product has poor plasticity, is brittle, and is easily interrupted during the process. The material utilization rate is low, and continuous production cannot be produced, let alone tin-bismuth welding wire with high Bi content.

Method used

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  • Preparation method for Sn-58Bi welding wire
  • Preparation method for Sn-58Bi welding wire
  • Preparation method for Sn-58Bi welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of Sn-58Bi welding wire, comprises the steps:

[0032] (1) Ingredients: mix the raw materials according to the mass percentage;

[0033] (2) Melting: Put the tin-bismuth alloy into the crucible, put it into the metal melting device, set the furnace temperature to 300°C, and keep it warm for 30 minutes.

[0034] (3) Casting: Cast the liquid tin-bismuth alloy into a 10mm*10mm*100mm groove mold, cool at room temperature, take out the rod-shaped blank after cooling, and preheat the rod with an induction heating furnace for 1 hour.

[0035] (4) Continuous extrusion process: the preheated Sn-58Bi alloy rod-shaped billet obtained in step (3) is continuously extruded through the preheated die (90°C) under the action of the friction force of the extrusion wheel groove Φ0.6mm Sn-Bi welding wire, in which the preheating temperature of the Sn-Bi alloy rod-shaped billet is 135°C; the extrusion ratio is 140; the speed of the extrusion wheel is controlled at 3r.m...

Embodiment 2

[0037] A preparation method of Sn-58Bi welding wire, comprises the steps:

[0038] (1) Ingredients: mix the raw materials according to the mass percentage.

[0039] (2) Melting: Put the tin-bismuth alloy into the crucible, put it into the metal melting device, set the furnace temperature to 250°C, and keep it warm for 60 minutes.

[0040] (3) Casting: Cast the liquid tin-bismuth alloy into a 10mm*10mm*100mm groove mold, cool at room temperature, take out the rod-shaped blank after cooling, and preheat the rod with an induction heating furnace for 1.5 hours.

[0041] (4) Continuous extrusion process: the preheated Sn-58Bi alloy rod-shaped billet obtained in step (3) is continuously extruded through the preheated die (60°C) under the action of the friction force of the extrusion wheel groove Φ0.8mm Sn-Bi welding wire, wherein the preheating temperature of the Sn-Bi alloy rod-shaped billet is 125°C; the extrusion ratio is 100; the rotation speed of the extrusion wheel is control...

Embodiment 3

[0044] A preparation method of Sn-58Bi welding wire, comprises the steps:

[0045] (1) Ingredients: mix the raw materials according to the mass percentage;

[0046] (2) Melting: Put the tin-bismuth alloy into the crucible, put it into the metal melting device, set the furnace temperature to 350°C, and keep it warm for 40 minutes.

[0047] (3) Casting: Cast the liquid tin-bismuth alloy into a 10mm*10mm*100mm groove mold, cool at room temperature, take out the rod-shaped blank after cooling, preheat the rod with a heating furnace, and keep it warm for 2 hours.

[0048] (4) Continuous extrusion process: the Sn-58Bi alloy rod-shaped billet obtained in step (3) is extruded continuously through the preheated die (120°C) under the action of the friction force of the extrusion wheel groove to a diameter of 1.0mm Sn-58Bi welding wire, wherein the preheating temperature of the rod-shaped blank is 150°C; the extrusion ratio is 150; the speed of the extrusion wheel is controlled at 2r.mi...

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Abstract

The invention discloses a preparation method for a Sn-58Bi welding wire, and belongs to the manufacturing field of low-temperature lead-free welding flux. The preparation method for the Sn-58Bi welding wire comprises the steps of preparing materials, smelting, casting and continuously extruding. The preparation method can enable a hard and bristle Bi phase to be more refined, and can enable dispersion distribution to be more uniform; the processed tin-bismuth welding wire is obviously improved in tensile strength and elongation at break, and is excellent in welding operational performance; the continuous extruding process is simplified, so that the manufacturing processes of rolling, pulling, drawing and the like are cancelled, and therefore, the material utilization rate is increased, and the production efficiency is higher. Sn-58Bi welding wires of different dimensions can be produced according to different needs.

Description

technical field [0001] The invention relates to a preparation method of Sn-58Bi welding wire, which belongs to the field of low-temperature lead-free solder manufacture. Background technique [0002] Sn-Pb solder is used as a mainstream connecting material in electronic packaging. However, because Pb and its compounds are toxic to the environment and human health, various countries have actively passed legislation to reduce and prohibit the use of harmful elements such as lead, and have carried out research and development activities on lead-free solder. At present, the alloy systems that are most likely to replace Sn-Pb solder mainly include Sn-Bi system, Sn-In system, Sn-Zn system and Sn-Ag-Cu system. The currently recognized lead-free solder design requirements include the following points: (1) have properties equivalent to or better than Sn-Pb; (2) the melting point should be lower than or equivalent to the melting point of the Sn-Pb eutectic alloy (183 °C ); (3) Non-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40B23K35/26
CPCB23K35/264B23K35/40
Inventor 尹建成刘丽娜王力强陈业高杨环刘英莉钟毅
Owner KUNMING UNIV OF SCI & TECH