Methods and apparatus for improved low current AC/DC TIG welding and starting
US9421630B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2013 |
| Grant date | Aug 23, 2016 |
| Priority date | — |
| Expiry date | Jun 15, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/1043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A TIG welder and methodologies for providing an output welding current in a welding circuit. The welder has main and background power supplies. The main supply has an SCR network which selectively connects a transformer secondary winding to the welding circuit according to SCR control signals. The background supply is connected to the SCR network, which selectively connects the second power supply to the welding circuit according to the SCR control signals. The SCR network may have first and second SCRs operating according to first and second SCR control signals from a control circuit, where the control circuit is connected to the SCR network and the second power supply and selectively connects the SCR control signals to the SCR network according to the setpoint current value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.