Statistical modelling and computer programs for optimisation of the electron beam welding of stainless steel

A statistical analysis of the electron beam welding of stainless steel samples was done using multiresponse statistical techniques. A model is created which includes the values of the distance between the electron gun and both the focusing plane of the beam and the sample surface as parameters. The response at work surfaces for the welding depth and width for variable beam power, welding speed, and the above two distances, determining the position of the beam focus towards the sample surface can be found. These predicted results coincide with the existing experimental experience in this technique. Computer procedures for the choice of operating conditions under some criteria for obtaining special parameters of the seam and for acquiring optimal weld parameters are also presented. It is possible to predict the geometrical characteristics of the seam when working in some chosen limited region of the welding parameters. (C) 2001 Elsevier Science Ltd. All rights reserved.