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研制出一台150 kV/30 kW高压脉冲电子束焊机,介绍了控制脉冲束流产生的偏压脉冲电源拓扑电路结构及脉冲束流频率、占空比、束流基值、束流峰值的调节控制技术.在0～1 kHz频率范围内,该电源可输出最大幅值200 mA的脉冲电子束束流,且工艺参数调节方便.分别采用脉冲束流与连续束流电子束工艺焊接了1Cr18Ni9Ti奥氏体不锈钢,对不同工艺的焊缝形貌进行了对比分析.与连续束流电子束焊接工艺相比,采用脉冲电子束焊接工艺的焊缝熔深增加,深宽比增大;对于脉冲电子束焊接工艺,占空比给定时,随着束流频率增加,焊接缺陷减少.试验结果表明:脉冲束流频率、占空比是影响焊缝成形的关键工艺参数;脉冲调制方式控制偏压是获得高压脉冲电子束的理想控制技术之一.
A 150 kV / 30 kW high voltage pulsed electron beam welding machine was developed. The topology structure of pulsed pulsed power supply with pulsed pulsed current and pulse frequency, duty ratio, beam current value and peak current The control technology of pulse width modulation (PWM) is used in the frequency range of 0 ~ 1 kHz, which can output pulsed electron beam with the maximum amplitude of 200 mA and convenient adjustment of process parameters.The pulse current and continuous beam electron beam are used to weld 1Cr18Ni9Ti Austenitic stainless steel, the weld morphology of different processes were compared.Compared with continuous beam electron beam welding process, the use of pulse electron beam welding process weld penetration depth increases, the aspect ratio increases; for the pulse When the duty cycle is given, the welding defects decrease with the increase of the beam frequency.Experimental results show that the pulse frequency and duty ratio are the key process parameters influencing the forming of the welding wire. The pulse modulation method controls the bias voltage Is to obtain high-voltage pulsed electron beam ideal control technology.