Shielding gas flow controller for a welding apparatus
US8258421B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2008 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Jun 1, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H1/3494
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A shielding gas (SG) flow controller for an arc welder includes SG input/output with a controllable valve therebetween, and having a control input, and a controller having a first input receiving a welding signal representing arc current and a gas flow setting controller generating a flow setting output based on the welding signal, representing a desired SG flow. Input and output pressure sensors provide SG input and out pressure to second and third controller inputs, respectively. A flow setting output modifier modifies the flow setting output of the gas flow setting controller based on the SG input/output pressure, the welding signal, and a characteristic of the controllable valve into a control signal input to the control input of the controllable gas valve to maintain a substantially constant SG flow corresponding to the flow setting output substantially independent of actual SG input/output pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.