The variation in arc characteristics and behavior of metal transfer with the change in pulse parameters has been studied by high speed video camera during pulse current flux-cored arc weld deposition.A comparative stu...The variation in arc characteristics and behavior of metal transfer with the change in pulse parameters has been studied by high speed video camera during pulse current flux-cored arc weld deposition.A comparative study of similar nature has also been carried out during flux-cored arc weld deposition in globular and spray transfer modes.The effect of pulse parameters has been studied by considering their mean current and arc voltage.The arc characteristics studied by its root diameter,projected diameter and length,and the behavior of metal transfer noted by the metal transfer model and the droplet diameter have been found to vary significantly with the pulse parameters.The observation may help in understanding the arc characteristics with respect to the variation in pulse parameters which may be beneficial in using pulse current FCAW to produce desired weld quality.展开更多
A simulation system used in the arc welding short circuit transfer process and current waveform control process was developed in this paper. The simulation results are basically consistent with welding technical exper...A simulation system used in the arc welding short circuit transfer process and current waveform control process was developed in this paper. The simulation results are basically consistent with welding technical experiments. The simulation system can be used to simulate and test the current waveform control parameters with welding variables. By this simulation system, the influence regularities of the current waveform control parameters in the CO 2 arc welding droplet short circuit transfer process can be got. Moreover, the basic mode of real time current waveform control can be also established by the simulation testing.展开更多
断路器的弧后电流是断路器开断性能的重要参量,为了获取高精度、低干扰的弧后电流,本文提出了一种基于真空开关、转移电阻、保护间隙和高精度电流传感器构成的弧后电流测量方法,其中真空开关负责导通大电流,在电流过零前电流转移到转移...断路器的弧后电流是断路器开断性能的重要参量,为了获取高精度、低干扰的弧后电流,本文提出了一种基于真空开关、转移电阻、保护间隙和高精度电流传感器构成的弧后电流测量方法,其中真空开关负责导通大电流,在电流过零前电流转移到转移电阻上,然后利用高精度电流传感器间接测量弧后电流。建立了弧后电流装置的电流转移过程模型,分析了电流转移完成时刻和转移电流峰值受转移电阻、电流大小和真空开关刚分时刻的影响。基于仿真得到弧后电流测量装置的参数,设计了弧后电流测量装置样机,对转移电阻进行了特殊无感设计并与保护间隙实现配合保护。最后进行了10 k V真空断路器在合成回路试验中的弧后电流测量,在开断5 k A电流时,弧后电流峰值为500 m A左右,脉宽5μs,弧后测量干扰小,波形平滑。对比试验结果和前人研究成果,验证了基于电流转移原理的弧后电流测量装置的可行性和准确性。展开更多
文摘The variation in arc characteristics and behavior of metal transfer with the change in pulse parameters has been studied by high speed video camera during pulse current flux-cored arc weld deposition.A comparative study of similar nature has also been carried out during flux-cored arc weld deposition in globular and spray transfer modes.The effect of pulse parameters has been studied by considering their mean current and arc voltage.The arc characteristics studied by its root diameter,projected diameter and length,and the behavior of metal transfer noted by the metal transfer model and the droplet diameter have been found to vary significantly with the pulse parameters.The observation may help in understanding the arc characteristics with respect to the variation in pulse parameters which may be beneficial in using pulse current FCAW to produce desired weld quality.
文摘A simulation system used in the arc welding short circuit transfer process and current waveform control process was developed in this paper. The simulation results are basically consistent with welding technical experiments. The simulation system can be used to simulate and test the current waveform control parameters with welding variables. By this simulation system, the influence regularities of the current waveform control parameters in the CO 2 arc welding droplet short circuit transfer process can be got. Moreover, the basic mode of real time current waveform control can be also established by the simulation testing.
文摘断路器的弧后电流是断路器开断性能的重要参量,为了获取高精度、低干扰的弧后电流,本文提出了一种基于真空开关、转移电阻、保护间隙和高精度电流传感器构成的弧后电流测量方法,其中真空开关负责导通大电流,在电流过零前电流转移到转移电阻上,然后利用高精度电流传感器间接测量弧后电流。建立了弧后电流装置的电流转移过程模型,分析了电流转移完成时刻和转移电流峰值受转移电阻、电流大小和真空开关刚分时刻的影响。基于仿真得到弧后电流测量装置的参数,设计了弧后电流测量装置样机,对转移电阻进行了特殊无感设计并与保护间隙实现配合保护。最后进行了10 k V真空断路器在合成回路试验中的弧后电流测量,在开断5 k A电流时,弧后电流峰值为500 m A左右,脉宽5μs,弧后测量干扰小,波形平滑。对比试验结果和前人研究成果,验证了基于电流转移原理的弧后电流测量装置的可行性和准确性。
