Contact wire for a roller seam welding machine
US4795875A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1986 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Jun 23, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K35/0205
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The contact wire (30) for a roller seam welding machine is provided on its front face with grooves (32) which are formed in the longitudinal direction of the wire and which are bounded by sharp longitudinal edges (34). The contact wire (30) is particularly well suited for welding metal sheets, the surfaces of which are heavily soiled or provided with coatings which are poor electrical conductors or electrically non-conducting. During the welding operation, the longitudinal edges (34) cut open the sheets to be welded or their oxide layer or coating which is a poor electrical conductor or non-conducting, and render possible a direct passage of the welding current to the actual metal sheet. Dirt as well as semi-plastic and vaporized coating material are reliably carried away to the front and rear in the longitudinal grooves so that the contact wire (30) cannot "float" during the welding operation. A preferred application for the contact wire (30) is the welding of fuel tanks from sheets which are coated so as to be poor electrical conductors or non-conducting on both sides, on a resistance roller seam welding machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.