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

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...

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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

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