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Resistance spot welding electrode and use of the electrode

A technology of resistance spot welding and electrodes, applied in the direction of resistance welding equipment, electrode characteristics, welding equipment, etc.

Active Publication Date: 2019-03-15
OUTOKUMPU OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of US Patent Publication US2015 / 0231729 is only applicable to rotationally symmetric electrode shapes

Method used

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  • Resistance spot welding electrode and use of the electrode
  • Resistance spot welding electrode and use of the electrode
  • Resistance spot welding electrode and use of the electrode

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Experimental program
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Embodiment Construction

[0030] figure 1 The end of the resistance spot welding electrode cap 1 is shown, which is in contact with the material to be welded during welding and has the shape of a modified letter C rotated by 180 degrees. The cap 1 is not axisymmetric in the vertical direction. exist figure 1 In , the web width w, the web length l and the radius r in the geometrical transition region of the cap 1 are shown. The cap 1 is positioned on the welded part such that the longitudinal direction of the welded part is indicated by arrow 2 .

[0031] figure 2 The end of the resistance spot welding electrode cap 6 is shown, which is in contact with the material to be welded during welding and has the shape of an unmodified letter L rotated by 180 degrees. The cap 6 is not axisymmetric in the vertical direction. exist figure 2 In , the web width w and the web length of the cap 6 are shown. The cap 6 is positioned on the welded part such that the longitudinal direction of the welded part is i...

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Abstract

The invention relates to a resistance spot welding electrode for dissimilar welded lap joints in crash-relevant structural components of automotive industry made of high-strength material. The resistance spot welding electrode is provided with a cap (1,6,11,16,21) having in that end of the electrode which is during welding in contact with materials to be welded together, a non-axially symmetricalcontact area in order to achieve between materials a weld nugget with an essentially similar non-axially symmetrical shape.

Description

technical field [0001] The present invention relates to a resistance spot welding electrode for use with high strength metallic materials such as aluminium, austenitic stainless steel or carbon steel in crash-related structural components. Background technique [0002] Crash-related structural components in the automotive industry, such as b-pillars, are manufactured as shell structures with different dissimilar sheets, which are then spot welded together by a resistance spot welding process. The shells of the b-pillars use high-strength press-hardened steel grades such as 22MnB5, which are alloyed with boron and contain up to 0.22-0.25% carbon by weight. As a result, the high ultimate strength Rm is 1500 MPa, but the weldability is reduced. During crash testing, it was noted that the transverse tensile force and brittle failure performance were reduced in the spot welds, which resulted in an unacceptable critical "zipper" condition of the intact b-pillar. For the inner sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/00B23K11/11B23K11/30B23K35/02B23K103/10B23K103/04
CPCB23K11/002B23K11/115B23K11/30B23K35/0205B23K2103/05B23K2103/10
Inventor T·欣德根S·林德纳
Owner OUTOKUMPU OY