Detection of temporary capillary stability in EB beam-deflection techniques using X-ray self-illumination

Vacuum, vol. 213, pp. 112121

Abstract

A deeper understanding of the temporal behaviour of capillaries enables the improvement of modern beam welding processes, e.g. the application of the multi-bath or multi-process technique in electron beam welding. The temporal capillary behaviour in an Electron Beam (EB) multi-bath welding process can be analysed at different beam deflection frequencies by means of secondary X-ray. This is visualised by X-rays which are generated during beam-material interaction in the capillary and can be visualised as an upside-down image on a scintillator screen via a pinhole camera. The analysis of the high-speed images allows conclusions regarding the inertia of a temporarily unheated EB capillary. This paper shows that with increasing deflection rate the collapse of capillary decreases while at a deflection rate of 1000 Hz no collapse in capillary depth can be detected.

Authors 4

1. S. Gach corresponding Aachen Welding and Joining Institute

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University, Welding and Joining Institute, Pontstraße 49, 52062, Aachen, Germany

2. Fatma Akyel corresponding Aachen Welding and Joining Institute

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University, Welding and Joining Institute, Pontstraße 49, 52062, Aachen, Germany

3. Simon Olschok Aachen Welding and Joining Institute

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University, Welding and Joining Institute, Pontstraße 49, 52062, Aachen, Germany

4. Uwe Reisgen Aachen Welding and Joining Institute

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University, Welding and Joining Institute, Pontstraße 49, 52062, Aachen, Germany