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Spot welding method for high strength steel sheet

A high-strength steel plate and spot welding technology, which is applied to welding power sources, welding power sources, welding equipment, etc., can solve problems such as low productivity, prolonged welding time, and difficult industrial locks

Inactive Publication Date: 2015-06-24
HYUNDAI MOTOR CO LTD +1
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  • Abstract
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Problems solved by technology

In addition, this technique is difficult to apply to industrial field locks due to low productivity due to prolonged welding time
Also, when there is a cooling time between pulses, only guidance is given on the soldering temperature and not on the soldering time, so there are many problems when the guidelines of conventional techniques are applied in practice

Method used

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  • Spot welding method for high strength steel sheet

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Embodiment Construction

[0012] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that when used in this specification, the term "comprising" refers to the presence of stated features, integers, steps, operations, elements and / or components, but does not exclude one or more other features, integers, steps, The presence or addition of operations, elements, components and / or combinations thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0013] Unless otherwise indicated or obvious from context, as used herein, the term "about" is understood as within a range of normal tolerance in the art, for example within two standard deviations of the mean. "About" can be...

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Abstract

A spot welding method for a high strength steel sheet is provided. The method includes a first pulse step for applying electric current of about 8 to 9 kA about 1 to 3 cy and a first cooling step for cooling for about 1 to 3 cy. In addition, the method includes a second pulse step for applying electric current less than the electric current applied in the first pulse step and a second cooling step for cooling for about 1 to 3 cy. A third pulse step includes applying electric current greater than the electric current applied in the second pulse step.

Description

technical field [0001] The present invention relates to a spot welding method for a high-strength steel plate having a maximum nugget diameter using multi-pulse welding conditions. Background technique [0002] Recently, with the increasing use of high-strength steel sheets in industrial places, maintaining the nugget diameter of resistance spot welding of ultra-high-strength galvanized steel sheets, such as 120kgf class galvanized steel sheets, has been recognized as a difficult problem. In single-pulse welding, due to the excellent heat generation of steel, spatter is generated, making it difficult to obtain a sufficient nugget diameter. At the same time, when using conventional multi-pulse welding, many welding variables are applied, but may not be suitable for industrial locations. Therefore, selecting the proper welding conditions may be more complicated. [0003] While conventional techniques use three types of pulses, the role of each pulse and the correlation among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11
CPCB23K11/11B23K2103/04B23K11/16B23K11/166B23K11/241B23K11/24
Inventor 柳志泓洪承贤朴泳度金载源
Owner HYUNDAI MOTOR CO LTD
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