Control of welding energy flux density
US4343980A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1980 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Apr 2, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K11/25
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An electrical resistance spot welding system and method is disclosed. The system has adjustable output power circuitry for applying electrical heating energy to a weld site by way of weld tips, in accordance with a welding operation. An energy monitor senses instantaneous accumulated energy applied during the welding operation, and terminates the operation when an adjustable predetermined total energy has been applied. Other circuitry monitors applied welding voltage, and derives therefrom a signal which is a function of the energy density per unit area applied at the weld site. Circuitry responds to the energy density sensing to control the energy monitor and the power circuitry to govern the total energy applied in the welding operation. As weld energy flux density decreases, such as happens when weld tips spread or "mushroom", total applied energy is increased, compensating for weld tip changes, thereby holding the amount of applied energy per unit of weld site area relatively constant from one welding operation to another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.