Starting and welding device for DC TIG welder and method of operating same
US6388232B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2000 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Jan 6, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/0673
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A DC TIG welder operable at a set low current level under about 5 amperes in a welding circuit including an electrode separated from a workpiece by a gap, the welder having an output welding current adjustable above the low current and driven by a constant current power supply with a first rectifier having an output current controlled by the firing phase of SCRs in an SCR network, a second rectifier settable at the low current and a sensor for sensing arc voltage. The welder further comprises: a circuit to deactivate the SCRs when the output welding current is equal to or less than the set low current and an arc starting device to cause the first rectifier to output a high pulse by operation of the SCRs of the network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.