Welding wire rod, manufacturing method thereof and welding method of welding wire rod and PCB

Abstract

The invention discloses a welding wire rod, a manufacturing method thereof and a welding method of the welding wire rod and a PCB. The welding wire rod comprises an insulating sleeve, a plurality of conductive cores and heat-shrinkable fiber strips, wherein one end of each conductive core and one end of each heat-shrinkable fiber strip extend out to form an exposed welding part, and the exposed welding part is divided into a middle section and an end section; the end section is connected with a first wrapping layer formed by a first welding material in a wrapping mode, the middle section and the first wrapping layer are connected with a second wrapping layer formed by a second welding material in a wrapping mode, and the heat-shrinkable deformation temperature of the heat-shrinkable fiber strip and the melting point temperature of the second welding material are both smaller than the melting point temperature of the first welding material. The manufacturing method comprises the following steps of firstly, stripping a section of insulating sleeve and manufacturing the first wrapping layer, and then stripping a section of insulating sleeve and manufacturing the second wrapping layer. According to the welding method, the welding wire and the PCB body are welded and fixed through a wave soldering method. Manual shearing is not needed after welding, the labor intensity of workers can be reduced, labor is saved, and meanwhile the welding portion has high welding strength and low protruding height.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding wire, its manufacturing method and its welding method with a PCB board. Background technique [0002] When welding wires to PCB boards and other boards, in order to ensure the connection reliability and reduce the overall thickness, the wires and boards are usually welded by wave soldering. The tube is stripped to expose the conductive core (usually copper core) as the exposed welding part, and after the exposed welding part passes through the welding hole on the plate, wave soldering is carried out by wave soldering equipment, so that the exposed welding part passes through the welding hole One section is welded and fixed with the plate. In order to ensure the welding strength, the section where the exposed welding part passes through the welding hole usually needs a certain length. Since the hardness of the conductive core is high and it is not easy to deform, it mu...

AI Technical Summary

Problems solved by technology

In order to ensure the welding strength, a section of the exposed welding part passing through the welding hole usually needs a certain length. Because the hardness of the conductive core is high and it is not easy to deform, it must be covered with a layer of welding material after wave soldering, resulting in the exposed welding part and its The welding part formed by the external covering welding material has a high protrusion height on the surface of the plate, which is easy to cause short circuit and other problems. Therefore, it is usually necessary to cut off a part of the welding part by manual shearing to reduce the protrusion height, which not only leads to production efficiency reduce the cost, increase the cost, and also reduce the welding strength between the exposed welding part and the plate, making it difficult to ensure welding reliability

At present, there is no welding technology that meets the requirements of high welding strength and low bump height with only one welding

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