JOINING METHOD OF DISSIMILAR METAL PLATES AND DISSIMILAR METAL JOINED BODY
First Claim
1. A method of joining dissimilar metal plates of an aluminum alloy plate and a plated steel plate by means of adhesion of an adhesive and spot welding,the method comprising:
- a lapping step of lapping the aluminum alloy plate and the plated steel plate via the adhesive;
a pre-heating step of clamping both of the metal plates that have been lapped in the lapping step between a pair of electrodes for spot welding and applying pressure thereto, and applying a current between the pair of electrodes;
a cooling step of pressurizing, after the pre-heating step, both of the metal plates at a pressing force which is higher than that at the start of the pre-heating step in a state where conduction between the electrodes is stopped, and continuing this pressurization over a predetermined cooling time; and
a welding step of pressurizing, after the cooling step, both of the metal plates at a pressing force which is higher than that at the start of the pre-heating step, and welding both of the metal plates by applying a current which is higher than the conduction current value in the pre-heating step between the pair of electrodes.
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Accused Products
Abstract
The joining method of the present invention includes a lapping step of lapping the aluminum alloy plate (1) and the plated steel plate (2) via the adhesive (5), a pre-heating step of clamping both of the metal plates (1, 2) that have been lapped in the lapping step between a pair of electrodes (7, 7) for spot welding and applying pressure thereto, and applying a current between the pair of electrodes (7, 7), a cooling step of pressurizing, after the pre-heating step, both of the metal plates (1, 2) at a pressing force which is higher than that at the start of the pre-heating step in a state where conduction between the electrodes (7, 7) is stopped, and continuing this pressurization over a predetermined cooling time, and a welding step of pressurizing, after the cooling step, both of the metal plates (1, 2) at a pressing force which is higher than that at the start of the pre-heating step, and welding both of the metal plates (1, 2) by applying a current which is higher than the conduction current value in the pre-heating step between the pair of electrodes (7, 7). It is thereby possible to firmly join the dissimilar metal plates (1, 2) by combining adhesion due to an adhesive and spot welding.
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Citations
17 Claims
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1. A method of joining dissimilar metal plates of an aluminum alloy plate and a plated steel plate by means of adhesion of an adhesive and spot welding,
the method comprising: -
a lapping step of lapping the aluminum alloy plate and the plated steel plate via the adhesive; a pre-heating step of clamping both of the metal plates that have been lapped in the lapping step between a pair of electrodes for spot welding and applying pressure thereto, and applying a current between the pair of electrodes; a cooling step of pressurizing, after the pre-heating step, both of the metal plates at a pressing force which is higher than that at the start of the pre-heating step in a state where conduction between the electrodes is stopped, and continuing this pressurization over a predetermined cooling time; and a welding step of pressurizing, after the cooling step, both of the metal plates at a pressing force which is higher than that at the start of the pre-heating step, and welding both of the metal plates by applying a current which is higher than the conduction current value in the pre-heating step between the pair of electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A dissimilar metal joined body in which an aluminum alloy plate and a plated steel plate are joined,
wherein a first joint part welded based on spot welding and a second joint part subject to adhesion with an adhesive exist between the aluminum alloy plate and the plated steel plate, and the first joint part is formed in an annular shape in a planar view.
Specification