Consumable-electrode AC gas shield arc welding method and apparatus therefor
US5349159A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | May 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/08
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A consumable electrode gas shielded AC arc welding method and an apparatus to practice the method applies alternating current across a consumable electrode and a base metal. During a first period, the electrode is positive and a current of a first level higher than a specified critical level is furnished. During a second period, the electrode is kept positive and current is reduced to a second level lower than the first level. During a third period, the electrode is kept negative at a third current level. These periods are periodically repeated. If during the frist period, the arc voltage drops below a predetermined voltage, current of a fourth level higher than the first level is furnished until the arc voltage exceeds the predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.