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Welded part precoated with soft solder layer(s) and preparation method for welded part

A technology of soft solder and weldment, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve problems such as unfavorable positioning, unfavorable welding quality, and inconvenient use by customers, achieve good welding quality, reduce welding void rate, and improve The effect of production efficiency

Pending Publication Date: 2019-12-13
GUANGZHOU SOLDERWELL ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The surface of some parts to be welded is easily oxidized. Before the later soldering, the surface to be welded has been severely oxidized, resulting in a high welding void rate, which is not conducive to achieving good welding quality
[0005] (2) Due to the particularity of the assembly process of some welded parts, it is inconvenient or even impossible to locate between the welded parts and the soft solder when the customer solders in the later stage, which may easily cause solder joint misalignment. bridging short circuit
[0006] (3) There is no transitional soft solder layer on the surface of some parts to be welded, which cannot achieve a good welding effect
[0007] (4) Some soft solders have special shapes, thinner or soft textures, which are easy to deform during packaging, transportation and assembly, causing inconvenience to customers and even affecting welding quality
[0008] (5) Some soft solders have special shapes and cannot be packaged in an orderly manner. Customers cannot perform automatic patch welding of soft solders, which greatly affects production efficiency
[0009] (6) Certain soft solders that need to be coated with flux are easily deformed during coating, or due to the stickiness of flux, soft solders are easy to stick to each other, which is inconvenient for production, packaging and customer use

Method used

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  • Welded part precoated with soft solder layer(s) and preparation method for welded part
  • Welded part precoated with soft solder layer(s) and preparation method for welded part
  • Welded part precoated with soft solder layer(s) and preparation method for welded part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Figure 1a The surface material of the part to be welded is copper, the composition of the soft solder layer is Pb92.5Sn5Ag2.5 in lead-based solder, and the thickness of the soft solder layer is 0.06mm. The preparation method comprises the following steps:

[0048] Step 1) Prepare the configured Pb92.5Sn5Ag2.5 soft solder into a strip of required thickness by calendering;

[0049] Step 2) cutting the strip in step 1) into a solder sheet having a size equivalent to the surface of the welded piece, and coating the solder sheet with a rosin-type flux suitable for copper welding;

[0050] Step 3) Assembling the welding sheet in step 2) and the piece to be welded;

[0051] Step 4) Put the solder piece assembled in step 3) and the workpiece to be welded through the hot pressing welding process: preheat at 220°C for 30 seconds, and then contact the assembled solder piece with a graphite hot pressing head at a temperature of 400°C and the welded piece, and keep it for 20 seconds...

Embodiment 2

[0053] Figure 1b The surface material of the part to be welded is nickel, the composition of the soft solder layer is Sn96.5Ag3Cu0.5 in tin-based solder, and the thickness of the soft solder layer is 0.1mm. The preparation method comprises the following steps:

[0054] Step 1) Prepare the configured Sn96.5Ag3Cu0.5 soft solder into a strip of required thickness by calendering;

[0055] Step 2) cutting the material strip in step 1) into a solder sheet having a size equivalent to the surface size of the welded part, and coating the rosin-type flux suitable for welding the nickel-plated parts on the solder sheet;

[0056] Step 3) Assembling the welding sheet in step 2) and the piece to be welded;

[0057] Step 4) Assemble the welded sheet and the welded part in step 3) through such as Figure 7 The advanced atmospheric pressure reflow soldering process makes the solder sheet and the welded piece metallurgically combined to form a Sn96.5Ag3Cu0.5 soft solder layer on the surface ...

Embodiment 3

[0060] Figure 1c The surface material of the part to be welded is aluminum, the composition of the soft solder layer is Sn83.6In8.8Zn7.6 in tin-based solder, and the thickness of the soft solder layer is 0.4mm. The preparation method comprises the following steps:

[0061] Step 1) Prepare the configured Sn83.6In8.8Zn7.6 soft solder into a strip of required thickness by calendering;

[0062] Step 2) cutting the strip in step 1) into a solder sheet having a size equivalent to the surface of the welded piece, and coating the solder sheet with a rosin-type flux suitable for welding aluminum parts;

[0063] Step 3) Assembling the welding sheet in step 2) and the piece to be welded;

[0064] Step 4) Put the assembled solder piece and welded part in step 3) through the induction welding process: the temperature is controlled at 230 ° C ~ 250 ° C, after the solder piece is melted, remove the welded part, and then air cool the welded part Until the soft solder layer is solidified, t...

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Abstract

The invention relates to the technical field of electron device welding, and particularly provides a welded part precoated with a soft solder layer(s), and the welded part comprises a welded part bodyand the soft solder layer(s) precoating the welded part. The invention further provides a preparation method for the welded part precoated with the soft solder layer(s), and the preparation method comprises the following main steps of preparing solder pieces -> assembling the solder pieces and the welded part -> forming the soft solder layer(s) on the surface(s) of the welded part. According to the welded part, after the welded part is precoated with the soft solder layer(s), the surface of the welded part can be prevented from being further oxidized, the welding voidage can be effectively reduced, and the weld layer quality of the welded part can be obviously improved; and moreover, a client does not need to assemble soft solder any longer in the later period, so that the process of positioning the welded part and the soft solder is omitted, and solder joint dislocation and even bridging short circuit caused by dislocation are not liable to cause.

Description

technical field [0001] The invention relates to the technical field of electronic device welding, in particular to a welded part with a surface pre-coated with a soft solder layer and a preparation method thereof. Background technique [0002] Soft solder is a solder whose liquidus temperature (melting point) does not exceed 450°C. Soldering is a type of connection method that realizes the connection by heating the soft solder to a temperature lower than the melting point of the welded part (base material) but higher than the melting point of the soft solder. The soft soldering process uses soft solder to spread on the surface of the workpiece through wetting, or spreads on the closely fitted connection surface through capillary action, and is widely used in rail transit, communication cables, aerospace, household appliances, new Various electronic device fields such as energy vehicles, wind power and photovoltaic power generation. [0003] The current soft soldering proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K3/08
CPCB23K3/082
Inventor 蔡航伟杜昆
Owner GUANGZHOU SOLDERWELL ADVANCED MATERIALS
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