A procedure for transferring electron beam welding parameters between different machines using the Enhanced Modified Faraday Cup (EMFC) electron beam diagnostic tool is described. Unlike existing qualitative methods based on the transfer of machine settings, this procedure utilizes quantitative measurements of specific beam parameters, which can be correlated to the size and shape of the welds produced by the different welding machines. As a demonstration of this transfer procedure, a sharply focused 100-kV, 10-mA beam produced on one machine at a work distance of 457 mm is replicated on another machine with a defocused beam at a work distance of 210 mm. Measurements made with this diagnostic tool show that the peak power densities of the resulting beams vary by only 2%, while the beam distribution parameters, which are a measure of the beam width, vary by 4 to 7%. Using these well-characterized beams, autogenous welds with similar shapes and depths were then produced on 304L stainless steel samples. The measured depths of these welds vary by only approximately 8%, thus providing evidence for the utility of the use of this diagnostic tool in the transfer of beam parameters between different machines.
|Original language||English (US)|
|Journal||Welding Journal (Miami, Fla)|
|State||Published - Dec 2007|
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys