Multi-stage resistance welding of sandwich-type metal sheets
US10583516B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Nov 5, 2014 |
| Grant date | Mar 10, 2020 |
| Priority date | — |
| Expiry date | Jan 11, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/34
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Sandwich panels may include an intermediate thermoplastic layer disposed between two metallic cover layers. Some methods for welding a sandwich panel to a metallic component may involve heating a region of the sandwich panel with a preheating current so that the thermoplastic layer is softened and by compression of the cover layers is displaced from the welding region. A tack-welding current flowing between first and second welding electrodes may weld the cover layers together, and a welding current may be used to weld the metallic cover layers to the metallic component. In some cases, the first welding electrode may be in contact with one of the metallic cover layers, and the second welding electrode may be in contact with the metallic component. As a result, the sandwich panel may be joined to the metallic component in a short cycle time without blisters and faults arising in the sandwich component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.