The influence of the input parameter in case of electron beam welding MUNTEANU ADRIANA, NAGÎŢ GHEORGHE Department of Machine Tools, Department of Machine Manufacturing Technology Technical University Gh Asachi Iasi B-dul D. Mangeron, no.59A ROMANIA adycypmunteanu@yahoo.com, nagit@tcm.tuiasi.ro Abstract: - Choosing an optimum working value for the electron beam welding input parameters is important both for obtaining some technological parameters and for ensuring the quality required. Mathematical empirical modelling of experimental data allows obtaining dependent relationships between weld penetration depth and width welding and inputting parameters. This selection of the process parameters makes it possible to choose the conditions favourable for any type of material. In this paper, a model for penetration depth and weld width estimation based on the working parameters is proposed. One can study the dependence of the penetration depth (H) and width welding (B) on the process parameters so that in the end the mathematical model describing this dependence will be validated based on experimental test results. Key-Words: - welding, electron beam process, mathematical model, penetration depth, width welding 1 Introduction Unconventional technologies are used in the processing of many common materials, not just for those with special properties. In many cases, due to the large volume of material that can be processed in a certain unit time these processes are more effective in comparison to classical processes, which imply a major consumption of energy and tools. In most of these new processes, energy and tools consumption is reduced or almost zero, some tools having high durability, as the processing electrochemistry, beams of electrons or ions, laser etc. The main processes that are based on the use of electron beam are: welding, drilling, hardening and heat treatment. Such processes are only part of many processing procedures based on the applications of electron beam. The process of electron beam welding is a method of making fusion weld; the heat is generated at the impact of an electron beam of high energy with the working pieces to be joined. This method produces deep welds without adding overly heat that can disadvantageous affect the properties of the surrounding metal. In the field of electron beam welding, the specialized literature is vast and covers up the research in the filed. Regarding the aspect mentioned in his paper, Koleva in 2005, [1] connected the electron beam welding parameters to the improvement of the process thermal efficiency. Chi in 2008, [2] analyzed the influences of electron beam welding parameters on weldments strength and defect formation in case of AZ-series magnesium alloys. Items related to heat-affected zone have been clarified in his work by Richards in 1994, [3]; these aspects regard the influence of electron-beam welding parameters on heat-affected-zone in case of INCOLOY 903, especially in case of microfissuring apparition. A process model for the heat-affected zone microstructure evolution in duplex stainless steel weldments was realised by Hemmer in 2000, [4]. The effects of electron beam focusing characteristics on fusion zone are analytically investigated by Ho in 2005 [5]. The paper analyzed the weld quality during electron beam welding depending on beam power, welding velocity, and focusing parameters. There are different researches connecting the weld penetration depth of linear energy, the speed of welding or theoretical relationships which attach an expression for determining the approximate relationship. Many studies associate the weld penetration with welding speed and focus on the effect of welding speed to penetration depth under conditions in which other parameters are kept constant, but do not take into account interactions between factors. In this way fewer issues addressed are related to the parameters dependence on the working parameters of the output process, requiring a relationship of this dependency. 2 Input parameter after systemic approach The main electro-technological parameters characterising electron beam welding process, according to their extent of interference in the welding process, may be the following [6, 7]: Proceedings of the 1st International Conference on Manufacturing Engineering, Quality and Production Systems (Volume II) ISSN: 1790-2769 484 ISBN: 978-960-474-122-9