Apparatus for short circuiting arc welding
US4972064A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/091
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An improvement in a short circuiting arc welding apparatus comprising a single D.C. power supply causing a welding current to pass through a welding wire extending from a holder and between said wire and workpiece at a molten metal pool on the workpiece, wherein the current flows in response to an arc voltage and the welding wire is subjected to a succession of welding cycles. Each of the welding cycles includes an arcing condition during which said wire is spaced from the pool and the energy applied to said wire exceeds a given value raising the temperature at the end of the wire to a molten temperature to form a molten metal ball on the end of the wire and a short circuit condition during which the molten metal ball on the end of the wire first contacts said molten metal pool and then transfers from the wire to the workpiece by a necking action breaking the molten metal ball from the wire to initiate an arc in a subsequent welding cycle. The welding cycles have a generally fixed frequency of repetition. The improvement comprises providing the power supply with a chopper circuit for applying a succession of input current pulses across the wire and workpiece at a pulse frequency su…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.