KR-102964091-B1 - Spot welding method for multi-layers and spot welding apparatus using the same

Abstract

The present invention relates to a welding method and a welding apparatus using the same, wherein the cross-sectional areas of two welding tips arranged on opposite outer surfaces of a multi-layered panel-type welding target are adjusted to control the heat generation between the interfaces of the welding target so that the nugget diameter is formed simultaneously. An intelligent welding method capable of multi-layer welding through the adjustment of the cross-sectional area of a welding tip according to the present invention is achieved by adjusting the cross-sectional areas of two welding tips arranged on both outer surfaces facing each other of a panel-type welding target that is superimposed in multiple layers, thereby controlling the heat generation amount between the interfaces of the welding target to be similar so that nugget diameters are formed simultaneously.

Inventors

• 오규환

Assignees

• 현대자동차주식회사
• 기아주식회사

Dates

Publication Date

20260513

Application Date

20210712

Claims (6)

1. A welding method capable of multi-layer welding, wherein the cross-sectional area of two welding tips arranged on both outer surfaces facing each other of a panel-type welding target layered in multiple layers is adjusted to control the heat generation between the interfaces of the welding target to be similar so that nugget diameters are formed simultaneously. A welding method capable of multi-layer welding, characterized in that the cross-sectional area ratio ( x/y ) of the two welding tips satisfies the following equation, which is a function of the thickness and resistivity of the workpiece, and the cross-sectional area ratio ( x/y ) of the welding tips has a tolerance of ±10%: (Here, ρ is the resistivity of each layer of the workpiece, t is the thickness of each layer of the workpiece, and i is the number of workpieces, which is a natural number greater than or equal to 2).
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3. In Article 1, A welding method capable of multi-layer welding, characterized in that the cross-sectional area ratio ( x/y ) of the welding tip has a tolerance of ±20%.
4. In Article 1, A welding method capable of multi-layer welding, characterized by a short pitch of 10 to 30 mm, which is the spacing between welding spots.
5. In Article 1, A welding method capable of multi-layer welding, characterized in that the number of welding targets is 3 or more.
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Description

Welding method capable of multi-layer welding through adjustment of the cross-sectional area of the welding tip and welding apparatus using the same {Spot welding method for multi-layers and spot welding apparatus using the same} The present invention relates to a welding method capable of multi-layer welding by adjusting the cross-sectional area of a welding tip and a welding device using the same. More specifically, the invention relates to a welding method and a welding device using the same that control the cross-sectional areas of two welding tips arranged on opposite outer surfaces of a panel-type welding target layered in multiple layers so that the amount of heat generated between the interfaces of the welding target is similar, thereby enabling the simultaneous formation of nugget diameters. There have been various attempts to improve welding quality or performance by improving conventional welding tips. For example, there is a method for manufacturing a composite spot welding electrode tip disclosed in Korean Patent Registration No. 10-0526413. This technology relates to a method for manufacturing a composite spot welding electrode tip in which a reinforcing material composed of a dispersion-strengthened copper alloy, in which fine particles of metal oxide are dispersed within a matrix of copper material, is firmly bonded and fixed to the tip of a body composed of a precipitation-hardened copper alloy having high conductivity. In particular, by bonding and fixing using a punch and a mold, it offers the advantage of excellent workability and productivity. In addition, there is a tip for a welding device and a welding method using the same disclosed in Korean Patent Registration No. 10-1585549. This technology enables welding by directly butting the head of a welding bolt onto a thin panel, thereby eliminating unnecessary work processes and improving work efficiency, as well as allowing the welding bolt to be welded and fixed at the precise location to be welded. Specifically, it provides a tip for a welding device and a welding method using the same, which allows welding bolts to be welded directly to a panel without a separate welding preparation process, such as spot welding, at the point where the panel and the head of the welding bolt meet, by supporting the panel surface with a jig so that a welding protrusion formed on the head of the welding bolt comes into contact with it, and supplying power through tips on both sides of the jig to weld. Furthermore, it offers the advantage that the welding bolt is inserted into the jig, placed between two tips for power supply, and welded directly to the panel to form an integral unit, thereby eliminating the need for separate pre-processing for welding on the panel or the welding bolt. In addition, the technology of an electric resistance spot welder having a dual composite electrode tip disclosed in Korean Patent Publication No. 10-2017-0134275 is also known. This technology relates to an electric resistance spot welder having a dual composite electrode tip that welds two metal plates by melting a contact surface at a predetermined position between metal plates while the metal plates are superimposed and made of different materials. Specifically, the electric resistance spot welder having a dual composite electrode tip has a first metal plate and a second metal plate superimposed between them, and includes a spot welding rod having an electrode formed at one end in contact with the metal plates, and performs spot welding. In the electric resistance spot welder, the spot welding rod comprises a rod-shaped first spot welding support rod that receives power from a first power supply unit, a rod-shaped second spot welding support rod that receives power from a second power supply unit and accommodates the first spot welding support rod internally with a space between them, and the first It includes a first electrode tip coupled to the end of a spot welding support rod and a second electrode tip coupled to the end of a second spot welding support rod and accommodating the first electrode inside, and accordingly, by controlling the amount of current supplied to each electrode tip constituting the dual composite electrode tip differently, the spot weldability of dissimilar metal plates is controlled according to the difference in the amount of current supplied to each electrode tip, thereby providing the advantage of easily performing spot welding on dissimilar metal plates. Furthermore, the technology regarding the electrode tip structure of a spot welding device disclosed in Korean Patent Registration No. 10-2063168 is known. This technology relates to an electrode tip structure of a spot welding device that enables spot welding even on welding areas having a narrow width, such as the flange of a door frame. Specifically, in a spot welding device in which the ends of the electrode tips are pressed against both sides of a plate and current is passed through t