Method for controlling and stabilizing fusion depth in electron-beam welding and device for effecting same
US4127762A · kind A · utility
Inventors
Key dates
| Filing date | Aug 24, 1976 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Aug 24, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K15/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In the course of welding measurements are taken of the concentration of metallic vapor in the cloud of vapor over the welding zone, the diameter of the hot spot on the article being welded being kept constant. Said concentration serves as an indication of the depth of fusion. The metallic vapor concentration is measured with the aid of a device comprising an electron quantity transducer, for example, a beam trap, with an electric filter connected to its output, said electric filter separating electric waves of frequencies upwards of 200 Hz. The alternating component thus separated is converted into d-c voltage and compared to a reference signal in a comparison circuit, upon which the electron beam current of the gun is altered, depending on the value of the error signal of said comparison circuit. The depth of fusion is found by way of changing the value of the output signal of the rectifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.