Engine driven arc welder
US5637246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1994 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Oct 17, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/1056
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
There is provided an engine driven arc welder adapted for converting a.c. output of welding generator into d.c. output to allow it to undergo switching control by using a switching circuit to detect an output of the switching circuit to control its ON/OFF period by the detected content to control a welding current. This engine driven arc welder further has a reference signal formation circuit for forming a reference signal such that when a detected voltage across welding terminals is higher than a first predetermined value, it has a first reference value. When the detected voltage is lower than a second predetermined value, the reference signal has a second reference value higher than the first reference value, and when the detected voltage is between the first and second predetermined values, the reference signal has a reference value of drooping characteristic continuously connecting first and second reference values, thus to compare a detected signal at the welding terminal with the reference signal of the reference signal formation circuit to control the switching circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.