Apparatus and method of short circuiting arc welding
US4897523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/091
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a short circuiting arc welding apparatus and method wherein a continuously fed welding wire alternates between an arcing condition during which the wire is spaced from the molten pool of the workpiece and a short circuit condition during which the melted metal on the end of the welding wire is in contact with the molten metal pool and thereafter transfers to the workpiece by a necking action breaking the melted metal from the wire, there is provided an improvement including providing a first high inductance current control circuit for continuously directing a low level, arc sustaining, background current between the welding wire and the workpiece and providing a second current control circuit for controlling current flow during the arcing condition of the process. This second current control circuit includes time delay means for causing the initiating arc at the start of the arcing condition to have an area determined primarily by the background current for a preselected time during which the molten metal on the tip of the welding wire and in the molten metal pool are drawn, by surface tension, to the wire and pool respectively, is essentially quelled and means for then passing …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.