We produce a unique electron beam generator with precise beam control. It consists of 2 main parts: an electron gun for precise beam control and a high voltage power supply. The electron gun is equipped with a triode and a cathode to form an axisymmetric electron beam with a small crossover, providing a circular focal spot shape during welding. The high voltage power supply delivers continuously adjustable beam voltage from 5 to 60 kV in pulse mode, allowing for precise energy and heat transferring.