Effect of welding speed on weld formation in electron beam welding with continuous penetration

摘要

Investigations were carried out into the conditions of free formation of welded joints in electron beam welding in the flat position with continuous penetration, and also into the dynamic model of the discharge of liquid metal of the weld pool from the root in which the metal moves downwards at a higher speed in the initial stage;;but during movement of the heat source the magnitude of acceleration decreases as a result of the reduction in the width of the welded joint due to solidification and increase in surface tension forces. A procedure for determining the minimum permissible welding speed at which the welded joints can form without undercutting in the tip is described.