关键词：电弧焊；脉冲电弧；传播热量；电磁热流体仿真
摘 要：The TIG arc welding is the high-quality joining technology. However, the weld pool is shallow in the TIG welding because the heat transfer to anode is poor. So, the weld defect sometimes occurs. The pulsed arc welding and mixing oxygen are used in order to control the heat transfer and prevent the weld defect. However, few reports has reported the variation of heat transfer to anode and the physical arc phenomena. In this paper, the time variation of heat transfer to anode in pulsed arc welding mixed with oxygen was elucidated in order to know the welding depth for prevention of welding defect. The thermal conductivity of heat transfer in the case of pulsed arc is not same as that in the case of stable arc. The thermal conductivity of heat transfer gradually decreases with increasing the time. The thermal conductivity of heat transfer can not catch up with the current waveform. When the arc is the transient mode, the arc radius and temperature distribution can not catch up with the stable arc ones. However, the heat transfer from center to r=3.00 mm can catch up current waveform. Thus, the thermal conduction of heat transfer varies over r=3.00 mm. The variation of it with Ar-O_2 is larger than that with pure Ar. Because the specific heat increases, the arc temperature at center becomes high.