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Spot welding method for aluminum material and aluminum material

A technology of aluminum and spot welding, applied in welding equipment, resistance welding equipment, welding/welding/cutting items, etc., can solve the problems of delay in welding operation, decrease in productivity, decrease in nugget roundness, etc., and achieve high joint strength , the effect of high-quality welding

Pending Publication Date: 2021-11-05
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is necessary to polish and trim the electrode whose tip shape has changed. However, if the frequency of grinding increases, the welding operation will be delayed and the productivity will decrease.
[0012] In addition, when the techniques described in Patent Documents 3 and 4 are used for welding together with an adhesive, even if the adhesive is removed from the welding position by forming protrusions, the roundness of the nugget will decrease, especially the joint strength in the plane direction. There is a possibility of deviation

Method used

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  • Spot welding method for aluminum material and aluminum material
  • Spot welding method for aluminum material and aluminum material
  • Spot welding method for aluminum material and aluminum material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] When two aluminum plates were spot-welded to form a joined body, reliefs of different heights were previously formed on one of the aluminum plates, and the state of the nugget formed in the prepared joined body was evaluated. Specifically, regarding the nugget after welding, the nugget diameter, roundness, penetration rate, penetration depth, weld thickness, and fracture diameter were measured and evaluated. In addition, evaluation was performed in the cases where no adhesive was applied (Test Example 1) and when the adhesive was applied (Test Example 2).

[0082]

[0083] (aluminum)

[0084] Material: A6022

[0085] Plate thickness t: 1.0mm

[0086] (electrode)

[0087] Type: Chromium copper (CrCu) R-shaped electrode

[0088] Front end curvature radius: 100mm

[0089] Electrode diameter (root diameter): 19mm

[0090] Pressure between electrodes: 2.7kN

[0091] Welding current: 22kA

[0092]

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Abstract

This spot welding method for an aluminum material comprises: a processing step in which, in a plan view, a circular emboss expanded in a direction of superposition on a second aluminum plate side is formed at a position-to-be-welded of a first aluminum plate; an arrangement step in which positions-to-be-welded are superimposed while the expansion side of the emboss faces the second aluminum plate, and the positions-to-be-welded are arranged between a pair of electrodes; a pressing step in which the superimposed aluminum plates are pinched between the electrodes, and a central side excluding a peripheral edge of the emboss is pressed; and an electrification step of performing pressing and electrification. An electrode having a tip diameter larger than the diameter of a root part of the expansion part of the emboss is used.

Description

technical field [0001] The invention relates to a spot welding method of an aluminum material and the aluminum material. Background technique [0002] As a method of spot welding overlapping aluminum materials with a pair of electrodes, there is a method of applying a first pressing force between the electrodes and then carrying out welding main energization, thereafter, applying a second external pressing force, and applying a thermal current after energization (such as , refer to Patent Document 1). In addition, there is also a method of applying a tempering current of 30% to 50% of the welding current for 2 cycles to 5 cycles without releasing the high pressure after the nugget is formed when spot welding the aluminum plate (for example, refer to the method of patent Document 2). [0003] In addition, when joining vehicle structures such as automobiles, an adhesive welding method in which an adhesive is used together with spot welding or resistance welding has been stud...

Claims

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Application Information

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IPC IPC(8): B23K11/11B23K11/18
CPCB23K11/115B23K11/185B23K11/34B23K11/3018B23K2103/10F16B47/003B23K11/3009B23K11/36
Inventor 吉泽舞岩濑哲
Owner KOBE STEEL LTD
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