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Spot welded joint

A technology of welding joints and welding joints, applied in the direction of welding equipment, welding medium, welding equipment, etc., to achieve the effect of excellent joint strength

Inactive Publication Date: 2015-12-23
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, in order to make the area pressed by the indenter arranged around the electrode into a plastic metal ring, the area needs to be heated, so the indenter arranged around the electrode is not actively cooled

Method used

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Examples

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Effect test

Embodiment

[0085] The following examples are given to illustrate the present invention more specifically, but the present invention is not limited by the following examples, and can be suitably modified and implemented within the scope of being able to adapt to the purpose of the foregoing and the following, and these are all included in the technical scope of the present invention Inside.

[0086] As the two steel plates joined by spot welding, mild steel, 590MPa-grade steel plates, 980MPa-grade steel plates, and 1470MPa-grade steel plates having the composition shown in Table 1 were used, and two steel plates with the steel types and plate thicknesses shown in Table 2 were used. Various combinations are performed to perform overlap spot welding.

[0087] As a welding device, use a single-phase AC resistance spot welder (50Hz), use Figure 4 A device with either (a) a DR-type electrode tip made of a common chrome-copper alloy or (b) a peripheral pressure-type electrode tip is attached ...

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Abstract

The purpose of the present invention is to provide a spot welded joint with superior joint strength even when the welded joint is obtained by spot welding high strength steel plates to each other. The spot welded joint is a welded joint obtained by superimposing and spot welding two steel plates with plate thicknesses t1 and t2 and is characterized by the diameter of the nuggets formed by spot welding being 3[square root of]{(t1 + t2) / 2} or greater (the units for the nugget diameter, t1 and t2 being mm), and, at the cross-sectional surface in the direction of plate thickness, the radius of curvature for both ends in the direction of diameter of the nugget being 0.3(t1 + t2) or greater.

Description

technical field [0001] The present invention relates to a spot welded joint. Specifically, it relates to a welded joint in which two thin steel plates are overlapped and spot welded. Background technique [0002] In joining between thin steel plates, resistance spot welding is most widely used. On the other hand, in the case of thin steel sheets for automobiles, high strength is being promoted in order to achieve both weight reduction and safety, and the addition of various alloy elements is required to achieve this. As a result, weldability deteriorates, and even in high-strength steel sheets, it is required to ensure the mechanical properties (hereinafter, simply referred to as "properties") of welded joints. [0003] Therefore, in order to improve the characteristics of the spot welded joint, various joining methods have been proposed. [0004] [Prior Art 1] [0005] For example, Patent Document 1 discloses a spot welding method that can join two or three superimposed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/30C22C38/00C22C38/04C22C38/58
CPCC22C38/04C22C38/58B23K11/115B23K11/166B23K11/185B23K11/3009B23K35/3073C22C38/02C22C38/08C22C38/12C22C38/16C22C38/32B23K2101/18B23K2101/34B23K2103/04B23K2103/10B23K11/16
Inventor 村上俊夫
Owner KOBE STEEL LTD